🌐 IP Address Lookup
Validate and classify any IPv4 or IPv6 address — version, class, and whether it is private, loopback, link-local, or multicast — computed locally with no geolocation and no external calls.
🔍 Analyze an IP Locally
What is an IP Address Lookup?
This lookup inspects the structure of an IP address: it confirms whether the address is valid, identifies IPv4 versus IPv6, and flags special ranges such as private, loopback, link-local, and multicast. For IPv4 it also reports the historical class.
Because it is purely local, it is a handy sanity check when you are reading firewall rules, configuring a subnet, or working out whether an address is routable on the public internet.
❓ Frequently Asked Questions
Does this look up the location of an IP?
No. This is a local analyzer, not a geolocation service. It parses and classifies the address you type — version, class, and range flags — entirely in your browser, and it never contacts any external database. That makes it fast and private, but it will not tell you a city or ISP.
What is a private IP address?
Private addresses are reserved for use inside local networks and are never routed on the public internet. For IPv4 these are 10.0.0.0/8, 172.16.0.0/12, and 192.168.0.0/16; for IPv6 the unique-local range fc00::/7 plays a similar role. Your router uses NAT to share one public address across many private ones.
What do 'loopback' and 'link-local' mean?
Loopback (127.0.0.0/8 in IPv4, ::1 in IPv6) always points back to the same machine — it is how a computer talks to itself. Link-local (169.254.0.0/16 in IPv4, fe80::/10 in IPv6) is auto-assigned for communication on a single network segment when no router or DHCP is available.
Are IPv4 address classes still used?
Class A/B/C/D/E predate modern routing and were largely replaced by CIDR, which uses arbitrary prefix lengths instead of fixed class boundaries. The classes are still useful as a quick mental model — for example class D (224–239) marks multicast — so this tool reports the historical class alongside the more relevant range flags.