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Fix the driver behind crashes, sound loss and screen glitchesFind Drivers →Clear out junk files and repair common Windows errorsFree Scan →Scan for outdated or missing drivers - takes under a minuteDriver Scan →A public Internet address is an IP address used for communication across the public Internet, rather than an address reserved for a private network. But “public” describes the address’s scope—not whether a device can accept connections from outside. Routing, firewalls, network address translation (NAT), and your provider’s setup all affect reachability.
What is a public IP address?
An Internet Protocol (IP) address identifies a network interface for sending and receiving traffic. A public IP address belongs to address space used on the public Internet. The phrase is commonly used to distinguish it from private IPv4 addresses reserved for local networks.
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Addressing is hierarchical: the Internet Assigned Numbers Authority (IANA) coordinates global address resources and delegates blocks to Regional Internet Registries; providers and other network operators then assign addresses to networks and users. See IANA’s overview of number resources and its explanation of IP address allocation.
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How is a public address different from a private IPv4 address?
IPv4 addresses in the following three ranges are reserved for private networks under RFC 1918. They are intended for use within networks, not as source or destination addresses on the public Internet. A home router can use them for devices on the local network.
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| Address range | Common notation | Typical use |
|---|---|---|
| 10.0.0.0–10.255.255.255 | 10/8 | Private IPv4 network |
| 172.16.0.0–172.31.255.255 | 172.16/12 | Private IPv4 network |
| 192.168.0.0–192.168.255.255 | 192.168/16 | Private IPv4 network |
IANA lists these as private-use addresses and notes they should not appear on the public Internet. Details are in IANA’s private-address guidance.
Is every address outside those ranges public?
No. The three RFC 1918 ranges are not an exhaustive test for whether an address is public. IANA designates 100.64.0.0/10 as Shared Address Space for service-provider use. It is separate from private-use space and can appear in provider networks, including where providers share IPv4 addresses among customers. Other IPv4 ranges are reserved for special purposes, too. Consult the IANA IPv4 Address Space registry rather than treating every address outside the private ranges as public.
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Why do several devices seem to use the same public IPv4 address?
In a common home setup, a provider assigns a public IPv4 address to the router’s Internet-facing side. Devices on the home network use private IPv4 addresses. The router uses NAT to translate traffic between the local addresses and the provider-facing address, so several devices can share one public IPv4 address for Internet communication. This is a common arrangement, not a description of every provider or network. The IETF discusses address sharing in RFC 6269.
Consequently, “my IP address” can mean different things: a device’s local address, the router’s provider-facing address, or the address a remote service sees after traffic has passed through NAT or other network infrastructure.
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How do you tell whether an IP address is public?
- Identify which address you are checking. A device’s Wi-Fi or Ethernet details usually show its address on the local network. A router’s Internet or WAN status shows the address on its provider-facing interface. These are not necessarily the same.
- For an IPv4 address, check the private ranges. If it falls within 10.0.0.0–10.255.255.255, 172.16.0.0–172.31.255.255, or 192.168.0.0–192.168.255.255, it is RFC 1918 private-use space.
- Check special-purpose assignments before classifying other addresses. For example, an address in 100.64.0.0/10 is Shared Address Space, not RFC 1918 private space. The IANA registry lists address-space designations.
- Interpret the result in context. A public-facing address does not prove that a device is reachable from outside. NAT, firewall rules, routing, and provider configuration can block or alter inbound connections.
Does “public IP address” include IPv6?
Yes. Public Internet addressing includes both IPv4 and IPv6. IPv4 uses 32-bit addresses commonly written as four decimal numbers separated by periods; IPv6 uses 128-bit addresses commonly written as hexadecimal groups separated by colons. IANA identifies 2000::/3 as IPv6 Global Unicast space, while maintaining separate special-purpose designations. Not every possible IPv6 address is globally usable or reachable. See IANA’s Number Resources overview and the IANA IPv6 Address Space registry.
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