PublicIPChecker

IP lookup tool

IP address lookup for any IPv4 or IPv6

Paste an address from a server log, email header or security alert to reveal its owner network, geolocation, autonomous system and proxy status. Nothing is sent to the address itself — the check is purely database-based.

Or — you can also share results with a link like /ip-lookup/?ip=1.1.1.1

Lookup result

Database query
0.0.0.0
Waiting for an address

Enter any IPv4 or IPv6 address on the left — results appear here instantly.

IP version
Country
City / region
ISP / organisation
ASN
Time zone
Local time
Connection type
Risk score
Postal code
Coordinates
Continent

What you get back

Every field explained

A lookup is only useful if you know what each value actually proves — and what it does not.

Country, region and city

Where the address block is registered. Country is highly reliable; city is an estimate that can be off by hundreds of kilometres.

ISP and organisation

The company that operates the network. A hosting brand here almost always means a VPN, proxy or cloud server rather than a home user.

ASN

The autonomous system announcing the route. The single best indicator of who really controls the address.

Proxy and anonymiser flag

Whether the address appears in public proxy, VPN or Tor exit databases at the time of the lookup.

Time zone and local time

Useful when correlating log timestamps across regions during an incident investigation.

Private range detection

RFC 1918, loopback, link-local and CGNAT ranges are identified so you do not chase an address that cannot exist on the internet.

Try it

Well-known addresses to test with

Example public IP addresses you can look up
AddressOperatorWhat it demonstrates
8.8.8.8Google Public DNSA classic datacentre address — hosting ASN, no residential ISP
1.1.1.1Cloudflare DNSAnycast address that resolves to different cities worldwide
2606:4700:4700::1111Cloudflare IPv6 DNSHow an IPv6 lookup differs from IPv4
192.168.1.1Your router (locally)A private RFC 1918 address that is not routable online

FAQ

IP lookup questions

Can I look up any IP address with this tool?

Yes. Enter any public IPv4 or IPv6 address — from a firewall log, an email header, an analytics report or a security alert — and you will get country, region, city, ISP, ASN, time zone and proxy flags. Private ranges are identified as non-routable instead.

How accurate is IP geolocation for a third-party address?

Country-level accuracy is typically 95–99%. City-level accuracy varies widely and is often wrong for mobile carriers, satellite links, corporate VPNs and CGNAT pools. Treat the city as a hint, and rely on the ASN and ISP fields for anything that matters.

Does looking up an IP notify its owner?

No. The lookup only queries geolocation databases; no packet is ever sent to the address you enter, so the owner of that IP receives nothing and learns nothing about you.

What is an ASN and why does it matter?

An autonomous system number identifies the network that announces a block of addresses to the internet. It is the most reliable signal in a lookup: it tells you whether an address belongs to a residential ISP, a mobile carrier, a hosting provider or a known VPN operator.