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1Clear out junk files and repair common Windows errors2Scan for outdated or missing drivers - takes under a minute3Repair Windows errors before they cause bigger problemsA DNS TXT record is a type of DNS record that stores text-based information for a domain. Unlike records that point traffic to a server, TXT records are mainly used to publish metadata that other services can read, such as proof of domain ownership, email authentication settings, and security-related policies.
TXT records are widely used because they are flexible and simple: a domain owner adds a string of plain text to DNS, and external systems check that value during a DNS lookup. This makes them essential for tasks like verifying a domain with Google or Microsoft, configuring SPF, DKIM, and DMARC for email protection, and supporting other domain-level security controls.
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Understanding how TXT records work helps you avoid misconfigurations that can break verification, weaken email security, or leave outdated policies in place. A clear grasp of their format, lookup behavior, and management best practices makes it easier to keep DNS settings accurate and safe.
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What Is a TXT Record in DNS?
A DNS TXT record is a type of Domain Name System record that stores text-based data for a domain or subdomain. Unlike records that point traffic to an IP address, such as A or AAAA records, a TXT record does not directly route visitors or deliver mail. Instead, it publishes plain-text information that other systems can read during DNS lookups.
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TXT records were originally created to let domain administrators attach human-readable s to DNS entries. Over time, they became a standard way for services to verify domain ownership, authenticate email, and publish security-related policies. Today, many cloud platforms, email providers, analytics tools, certificate authorities, and security products ask you to add a TXT record to prove that you control a domain.
A TXT record is stored inside a domain’s DNS zone. It usually contains a name, a record type, a value, and a time to live value. The name defines where the record applies, such as the root domain, a subdomain, or a special hostname like _dmarc. The value contains the text string that external systems need to read. The TTL controls how long DNS resolvers may cache the record before checking for an updated version.
What a TXT Record Can Contain
Although the record is called “text,” the content is often structured rather than a simple sentence. Many TXT records use key-value pairs so software can interpret them consistently. For example, an SPF record for email authentication may begin with v=spf1, while a DMARC policy may begin with v=DMARC1. Verification records often contain a unique token generated by a third-party service.
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- Email authentication: Publishes SPF, DKIM, and DMARC data to help receiving mail servers detect spoofing and phishing attempts.
- Security policies: Shares policy instructions or validation data used by security platforms, certificate authorities, and monitoring tools.
- Service configuration: Provides domain-specific settings that applications can discover through DNS.
Mulle TXT records can exist for the same domain, but each service expects its own value to follow a specific format. For instance, you might have one TXT record at the root domain for SPF, another at _dmarc.example.com for DMARC, and another at a provider-specific hostname for ownership verification. The records all use the same TXT record type, but their names and contents serve different purposes.
Because TXT records are publicly accessible through DNS, they should not be used to store passwords, private keys, API secrets, or confidential internal details. Anyone can query a domain’s TXT records with standard DNS tools. A well-managed TXT record should contain only the information required by the service that needs it, follow the provider’s exact syntax, and be removed when it is no longer needed.
How TXT Records Work During DNS Lookups
When an application needs the TXT records for a domain, it asks DNS for records of type TXT. The request may come from a mail server checking SPF, a certificate authority validating domain control, a security scanner reading DMARC policy, or a command-line tool such as dig or nslookup. TXT records are not returned automatically with every DNS lookup; the requester must query for the TXT record type at a specific name, such as example.com or _dmarc.example.com.
The lookup follows the normal DNS resolution path. A client sends the query to a recursive resolver, often operated by an internet provider, cloud DNS service, or company network. If the resolver already has a fresh cached answer, it returns it immediately. If not, it works through the DNS hierarchy: root servers point it to the correct top-level domain servers, such as .com; those servers point it to the authoritative name servers for the domain; the authoritative server then returns the TXT record data for the requested hostname.
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TXT data is scoped to the exact DNS name being queried. A TXT record at example.com is separate from one at www.example.com, _dmarc.example.com, or selector1._domainkey.example.com. This is especially relevant for email authentication, where each protocol expects records at particular names. SPF is commonly placed at the root domain or a sending subdomain, DMARC uses the _dmarc prefix, and DKIM uses a selector plus ._domainkey so mulle keys can exist for the same domain.
Typical TXT lookup flow
- A service or application asks for the TXT record at a specific DNS name.
- The recursive resolver checks its cache for an unexpired answer.
- If needed, the resolver contacts the DNS hierarchy to find the authoritative name server.
- The authoritative name server returns one or more TXT record values.
- The resolver caches the response according to its TTL and passes it back to the requester.
- The requesting service reads the text and applies the relevant validation or policy rules.
A single DNS name can have mulle TXT records, and each TXT record can contain one or more quoted character strings. DNS servers may split long TXT values into smaller quoted chunks, but clients normally join those chunks into one continuous value for processing. This commonly happens with DKIM public keys because they can exceed the character length that a DNS provider allows in one quoted segment.
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TTL, short for time to live, controls how long resolvers may cache TXT responses. A high TTL reduces repeated queries and can improve efficiency, but changes take longer to appear everywhere. A low TTL is useful before planned updates, such as rotating a DKIM key or changing an SPF include, because resolvers will refresh the record sooner. After the update is stable, many teams raise the TTL again to reduce query volume.
TXT lookups can also return no usable data even when a record appears to exist in a DNS dashboard. Common causes include querying the wrong hostname, publishing the record in the wrong DNS zone, leaving old conflicting values in place, or waiting for cached responses to expire. For accurate troubleshooting, query the authoritative name servers directly and compare that result with public recursive resolvers. This helps separate publishing problems from normal cache delay.
Common Uses of DNS TXT Records
DNS TXT records are used whenever a domain needs to publish small pieces of trusted, machine-readable text. Although they were originally designed for general s, modern TXT records are most often used by third-party services, mail servers, and security tools to confirm that a domain owner has approved a specific configuration. Because TXT records are public in DNS, any system can query them and compare the returned value with what it expects.
Domain ownership verification
One of the most common uses of TXT records is proving control of a domain. Services such as Google Workspace, Microsoft 365, search engine consoles, CDN providers, and SaaS platforms often ask the domain owner to add a unique TXT value to DNS. After the record is published, the service performs a DNS lookup for that domain and checks whether the expected token is present.
For example, a provider might ask for a TXT record containing a value such as google-site-verification=abc123example or MS=ms12345678. The token itself does not usually change how the website or email works. It simply proves that the person configuring the service has access to the domain’s DNS zone.
Email authentication
TXT records are central to protecting email sent from a domain. Several major email authentication standards depend on TXT records because receiving mail servers need a public way to check whether a message is legitimate. The most common email-related TXT records are SPF, DKIM, and DMARC.
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- DKIM: Publishes a public cryptographic key used to verify that an email was signed by an authorized sender and was not altered in transit.
- DMARC: Tells receiving mail servers how to handle messages that fail SPF or DKIM checks, and can send reports to the domain owner.
These records help reduce spoofing, phishing, and unauthorized use of a domain in email. For instance, a company using a marketing platform and a helpdesk system may need to include both services in its SPF configuration and publish separate DKIM TXT records for each provider.
Security and policy declarations
TXT records can also publish domain-level security policies. A domain might use TXT records to advertise reporting addresses, specify trusted certificate authorities, or support service-specific protections. While some newer standards use dedicated DNS record types, TXT records remain widely supported and are often chosen because DNS providers and validation systems handle them reliably.
Common security-related examples include values used for certificate authority authorization, abuse reporting, and vendor-specific security validation. For example, a security platform may request a TXT record before allowing a domain to be monitored, scanned, or protected through its service.
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Many cloud and application platforms use TXT records to connect a custom domain to an account. This is common with hosting providers, analytics tools, collaboration suites, payment platforms, and customer support systems. The TXT record acts as a lightweight confirmation step before the service accepts traffic, sends email, or displays branding for that domain.
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In practice, a single domain can have mulle TXT records at the same hostname, especially when several vendors need verification. Good DNS management becomes important because old verification records, duplicate SPF entries, or abandoned vendor tokens can create confusion and may weaken domain security over time.
TXT Record Format and Syntax Examples
A TXT record is made up of a domain name, DNS record type, time to live value, and one or more text strings. In most DNS control panels, you enter only the host/name and the value/content, while the provider handles the record type and TTL separately. The host identifies where the TXT record applies, such as the root domain, a subdomain, or a special selector used by an email or security service.
The value is stored as plain text, but it must follow DNS formatting rules. A TXT value is usually wrapped in quotation marks in zone-file syntax, and each individual character string can be up to 255 bytes. Longer TXT data, such as some DKIM public keys, can be split into mulle quoted strings within the same TXT record. DNS resolvers join those strings together when reading the record, so the service checking the value sees one continuous result.
Basic TXT Record Structure
| Field | Example | Purpose |
|---|---|---|
| Name | @ | Applies the record to the root domain, such as example.com. |
| Type | TXT | Identifies the DNS record as a text record. |
| TTL | 3600 | Controls how long resolvers may cache the response, in seconds. |
| Value | “google-site-verification=abc123” | Stores the plain-text data used by an external service. |
In a traditional DNS zone file, a simple TXT record for domain verification may look like this:
example.com. 3600 IN TXT "google-site-verification=abc123xyz"
Many DNS dashboards use different labels for the same fields. For example, @ often means the root domain, while a host such as _dmarc creates a record at _dmarc.example.com. Some providers require the full name, and others append the domain automatically. Entering _dmarc.example.com in a panel that appends the domain can accidentally create _dmarc.example.com.example.com, which will not validate correctly.
Common Syntax Examples
- Domain verification:
@ TXT "google-site-verification=abc123xyz" - SPF email authorization:
@ TXT "v=spf1 include:_spf.google.com -all" - DMARC policy:
_dmarc TXT "v=DMARC1; p=quarantine; rua=mailto:[email protected]" - DKIM public key:
selector1._domainkey TXT "v=DKIM1; k=rsa; p=MIIBIjANBgkqh..." - Microsoft 365 verification:
@ TXT "MS=ms12345678"
TXT record values are case-sensitive for many verification tokens and email authentication strings, so copy them exactly from the service that provides them. Spaces also matter, especially in SPF records. For example, v=spf1 include:example.net -all is valid syntax, but removing spaces between mechanisms can break the policy. TXT records used for SPF should also be kept to a single SPF policy per hostname; publishing mulle SPF TXT records at the same name can cause email authentication failures.
Quotation marks can be confusing because DNS providers handle them differently. In zone files, quotes are required around text strings. In many web-based DNS editors, you can paste the value without outer quotes, and the platform adds them automatically. If the provider displays quotes after saving, that is usually normal. If the service gives a value containing semicolons, equals signs, underscores, or colons, those characters are typically part of the TXT data and should not be removed.
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How to Add or Update a TXT Record
Adding or updating a TXT record is usually done in the DNS management area of the provider that hosts your domain’s authoritative nameservers. This may be your domain registrar, hosting company, DNS provider, CDN, or cloud platform. Before making changes, confirm where your DNS zone is managed by checking the domain’s nameservers; editing TXT records in the wrong control panel will not affect live DNS responses.
- Sign in to your DNS provider: Open the dashboard for the provider that controls the domain’s DNS zone.
- Choose the domain: Select the domain name you want to modify, such as example.com.
- Open DNS records: Look for a section named DNS, DNS Zone, Zone Editor, Advanced DNS, or Records.
- Add or edit the TXT record: Create a new TXT record or select an existing one to update.
- Enter the host/name value: Use @ for the root domain if your provider supports it, or enter a subdomain such as _dmarc, selector1._domainkey, or _acme-challenge.
- Paste the TXT value: Enter the exact text supplied by the service requesting the record, including prefixes such as v=spf1, v=DMARC1, or verification tokens.
- Set the TTL: Choose a time to live value, such as 300 seconds for a temporary change or 3600 seconds for normal operation.
- Save the record: Apply the change and allow time for DNS propagation and resolver caching.
The host field determines where the TXT record appears in DNS. For example, a record named @ is published at example.com, while a record named _dmarc is published at _dmarc.example.com. Some providers automatically append the domain name, so entering _dmarc.example.com instead of _dmarc can accidentally create _dmarc.example.com.example.com. Check your provider’s interface carefully, especially when copying instructions from email platforms, SSL certificate services, or SaaS verification pages.
When updating an existing TXT record, avoid creating duplicates unless the service explicitly allows more than one record at the same name. SPF is the most common case where this causes problems: a domain should have only one SPF TXT record at the same hostname. If you need to authorize an additional mail sender, merge it into the existing SPF value rather than adding a second v=spf1 record. DKIM records are different because each selector has its own hostname, so mulle DKIM TXT records can exist as long as they use different selector names.
| Task | Typical Host | Example Value |
|---|---|---|
| Domain verification | @ | google-site-verification=abc123 |
| SPF email authorization | @ | v=spf1 include:_spf.example.net -all |
| DMARC policy | _dmarc | v=DMARC1; p=quarantine; rua=mailto:[email protected] |
| ACME certificate challenge | _acme-challenge | temporary-validation-token |
After saving, verify the record using a DNS lookup tool such as dig, nslookup, or an online DNS checker. Query the exact hostname where the record should exist and compare the returned value with the required value. If the old value still appears, wait for the previous TTL to expire. For urgent migrations, lower the TTL several hours before the planned change, then raise it again after the new TXT record is confirmed working.
Best Practices for Managing TXT Records
TXT records often control high-value functions such as domain ownership validation, SPF mail authorization, DKIM signatures, DMARC policy, MTA-STS, and service integrations. Because they are simple text entries, they can be easy to create but also easy to neglect. A safe management process should track what each record does, who requested it, when it was added, and whether it is still required.
Keep records documented and easy to audit
Maintain an internal inventory of TXT records for every domain and subdomain you manage. Include the hostname, full value, provider or service name, date added, owner, and expected review date. This is especially useful for verification records from services such as Google Workspace, Microsoft 365, Stripe, GitHub, or certificate authorities, since some are only needed temporarily while others must remain in place for the service to function.
- Label ownership: Record which team or vendor depends on each TXT value.
- Remove expired verification tokens: Delete one-time domain validation entries after confirming they are no longer needed.
- Review email authentication records: Check SPF, DKIM, and DMARC records whenever mail providers change.
- Monitor root and subdomain entries: TXT records can exist at example.com, www.example.com, _dmarc.example.com, and many other names.
Avoid conflicts and oversized records
Some TXT-based standards allow only one effective record per hostname. SPF is the most common example: a domain should not publish mulle SPF TXT records at the same name. Instead, combine authorized senders into a single SPF value, while staying within DNS lookup limits. For DKIM and DMARC, use the exact selector or policy hostname required by the service, such as selector1._domainkey.example.com or _dmarc.example.com.
Long TXT values must be handled carefully. DNS providers may split long strings into quoted chunks behind the scenes, but the record must still resolve as one continuous value to clients. When pasting DKIM public keys or security policy records, copy the value from the source system exactly, avoid extra spaces, and verify it with a DNS lookup tool after publishing. If your provider automatically adds the domain name to host fields, enter only the relative host, such as _dmarc, rather than the full domain.
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Before changing a TXT record, lower the TTL if your DNS provider supports it and you need a faster rollback. Make one change at a time when possible, then test from mulle public resolvers after propagation begins. For mail-related TXT records, use a staged approach: publish DMARC with a monitoring policy such as p=none, review reports, then move gradually toward stricter policies like quarantine or reject.
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- Back up current values before editing records, especially SPF and DKIM entries.
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- Validate after every change using command-line tools or reputable DNS checkers.
Treat TXT records as part of your domain security configuration, not as disposable text snippets. Regular reviews, careful formatting, and controlled access reduce outages, failed verifications, spoofed mail exposure, and stale third-party dependencies.
Frequently Asked Questions
How long does it take for a new TXT record to start working?
TXT record changes can appear within a few minutes, but full DNS propagation may take up to 24–48 hours depending on the record’s TTL and DNS caching. If you are verifying a domain with Google, Microsoft, or another service, wait at least the TTL period before assuming the record is not working.
Can one domain have multiple TXT records?
Yes, a domain can have mulle TXT records, and this is common for domain verification, SPF, DKIM, DMARC, and other services. However, SPF is a special case: you should only have one SPF TXT record for a hostname, because multiple SPF records can cause email authentication failures.
Where should I add a TXT record, at the root domain or a subdomain?
Add the TXT record exactly where the service provider tells you to place it. A root-domain TXT record usually uses the host value @, while records for DKIM, DMARC, or service verification may use names such as _dmarc or selector._domainkey. Placing the record at the wrong hostname is one of the most common reasons verification fails.
Can TXT records affect my website or DNS performance?
TXT records do not directly affect how your website loads unless a service depends on them for validation or security. They can affect email delivery if SPF, DKIM, or DMARC records are missing, duplicated, or misconfigured. Very large TXT records can also create DNS response-size issues, so keep records concise and remove obsolete entries.
How do I check whether my TXT record is correct?
You can check TXT records with DNS lookup tools such as dig, nslookup, or online DNS checkers. Query the exact hostname, not just the main domain, and compare the returned value with the value provided by the service. If the record does not appear, confirm you edited the authoritative DNS provider for the domain.
Bottom Line
A DNS TXT record is a flexible way to attach plain-text instructions or proof to a domain, most often for verification, email authentication, and security policies like SPF, DKIM, and DMARC. Although it looks simple, its exact formatting, placement, and values matter because small mistakes can break validation or weaken protection.
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1Clear out junk files and repair common Windows errors2Fix the driver behind crashes, sound loss and screen glitches3Repair Windows errors before they cause bigger problemsWhen adding or changing TXT records, copy values carefully, avoid duplicate or conflicting entries, and allow time for DNS propagation. If you manage email or domain security, review your TXT records regularly to keep them accurate, current, and aligned with the services you use.
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