numlookupapi.com

Numlookupapi is a phone-number validation and lookup API for developers building call-routing, lead-screening, or fraud workflows. It is best for applications that need number metadata across countries, rather than a way to identify callers. Batch lookups and language SDKs make integration practical, but the free allowance is limited and some results may lack carrier or location data.

Overview

The JSON REST API covers phone numbers in more than 230 countries. A lookup can return country, location, carrier, line type, time zone, E.164 and national formats, and a tel: link for click-to-call. These fields can help normalize input and supply signals for routing or screening; they are not a complete profile of a number, since carrier and location may be empty.

Numlookupapi does not return the name or address of the person behind a number. Its lookup data comes from several phone data providers and international carriers. The service reports 99.99% API uptime over the preceding 12 months and offers a status page for current conditions, a useful availability commitment to weigh alongside the possibility of incomplete lookup results.

Key features

Number validation and line types

The API identifies mobile, landline, toll-free, premium-rate, satellite, VoIP, shared-cost, personal, and UAN number types. That range can help a contact center decide how to route a number or a lead system flag a type relevant to its workflow. It does not, by itself, establish that a number is reachable or reveal who uses it.

Batch requests and developer access

Batch validation handles up to 100 phone numbers per request, reducing the overhead of sending records individually. Official SDKs cover JavaScript, Ruby, PHP, and Python, and the documentation links to a Postman collection. Developers can use HTTP API access with API-key authentication in headers or GET parameters; a hosted MCP server is also offered for AI agents.

Free users are limited to 10 requests per minute, while paid plans have no rate limit. The per-minute cap matters for bursty workloads even when total volume stays within the free quota. Technical support questions receive an actionable reply within 24 hours, which gives teams a defined response expectation.

Privacy and security

The privacy policy describes technical and organizational measures intended to prevent unauthorized access, alteration, disclosure, or destruction of personal data. It also says the site may collect names and email addresses and use cookies, and describes GDPR rights including access, correction, deletion, and portability. These policy details do not change the API’s key limitation: it returns number attributes, not subscriber identity.

Pricing

Numlookupapi is freemium. The Free plan is billed at $0.00 /mo and includes 100 requests, batch validation, one API key, and a limit of 10 requests per minute. It is suitable for a small integration or initial evaluation, but the 100-request monthly allowance is too narrow for sustained production use.

Basic is the lowest paid tier, moving the monthly allowance to 5,000 and removing the rate cap, but it remains limited to one API key and does not include the sandbox keys or team management offered above it. Pro is a better fit for teams needing more volume, a second key, and team management. Scale adds substantially more requests and controls such as IP and URL allowlisting, an SLA, and overages; it suits larger workloads that need those operational provisions. Custom pricing is for teams needing a custom request volume, key count, or SLA.

Choose a tier by monthly request volume as well as throughput: paid plans have no rate limit, but each named plan still has a request allowance. Batch requests can process up to 100 numbers at once, but that batch ceiling does not replace the plan’s monthly quota.

Platforms

Numlookupapi is available as an API and on the web. Its HTTP access, SDKs for four languages, and Postman collection suit developers integrating validation into an application; the hosted MCP server is an additional route for AI-agent workflows.

Who it's for

The strongest fit is a developer or team adding phone-number validation and attributes to inbound call screening, contact-center routing, or fraud-signal workflows. Broad country coverage, multiple line-type classifications, and batch requests make it relevant when those systems process numbers at scale. It is a poor fit for anyone seeking a caller’s identity, or for a production workload that cannot work within the chosen plan’s request quota or tolerate occasional empty location and carrier fields.

Pros and cons

• Pros: Coverage across 230+ countries and a wide range of line types can support international validation and routing.
• Pros: Batch requests of up to 100 numbers and SDKs in JavaScript, Ruby, PHP, and Python give developers several integration options.
• Pros: The $9.99 /mo Basic tier raises the allowance to 5,000 requests and removes the Free plan’s per-minute rate cap.
• Cons: The Free plan’s 100 monthly requests make it a small-scale evaluation option, not a generous ongoing allowance.
• Cons: Carrier and location may be empty, limiting their usefulness as dependable fields in a workflow.
• Cons: It does not identify the person behind a number, so it cannot serve as a reverse-identity lookup.

Alternatives

For a wider comparison, browse Phone Number Validation Software.

Choose IPQualityScore Phone Validation API if its free tier of 1,000 lookups per month and monthly volume-tiered flat-rate pricing, without monthly contracts, better fit your usage. PhoneValidationAPI is another freemium API option, with a Basic plan at $14.99 /month for 6,000 API requests per month.

If you need a library rather than a hosted lookup service, libphonenumber-js is a free, open-source JavaScript/TypeScript library under MIT and Apache-2.0 licenses. For email checks rather than phone validation, Abstract Email Validation API offers a freemium API; its Starter plan is $17.00 per month, billed annually, for 60,000 requests per year and 3 requests per second. Veriphone offers a free tier with 1,000 validations per month and full carrier and line-type data.

Accessibility Test Framework for Android is a free framework for Android accessibility testing. Neutrino Phone Validate and Numverify are also phone-validation alternatives.

Verdict

Numlookupapi is a solid choice for developers who need international phone validation, batch processing, and number attributes for routing or screening, especially if 5,000 monthly requests at $9.99 /mo is enough. Its clear strengths are broad line-type coverage and practical integration options. Look elsewhere if you need caller identity, richer guarantees for carrier and location fields, or a larger free allowance.