IP Address Lookup

The IP Lookup tool returns detailed information about any IPv4 or IPv6 address: approximate geographic location (country, region, city), the Internet Service Provider (ISP), organization name, Autonomous System Number (ASN), timezone, and reverse DNS (PTR record). Look up your own IP with one click, or paste any other IP from server logs, firewall alerts, suspicious traffic, or email headers to understand who it belongs to and where it originates.

Location accuracy varies. Country-level info is reliable (99%+ accurate). City-level is approximate (often the nearest major city for datacenter IPs). Residential IP locations can vary from the actual user\u2019s location by tens of kilometers because ISPs assign IPs from regional pools. The tool uses IP-to-location databases derived from RIR (Regional Internet Registry) records and BGP routing data. ASN and WHOIS info come from authoritative registries (ARIN, RIPE, APNIC, LACNIC, AfriNIC) and are highly accurate for identifying the organization that owns a block of IPs.

An IPv4 address is a 32-bit number represented as four dotted octets (192.168.1.1). IPv6 is 128-bit represented as eight hex groups separated by colons (2001:0db8::1). The public internet uses both, though IPv4 still dominates.

IP allocation hierarchy: IANA allocates large blocks to the five Regional Internet Registries (ARIN for North America, RIPE for Europe/Middle East/Central Asia, APNIC for Asia-Pacific, LACNIC for Latin America, AfriNIC for Africa). RIRs allocate smaller blocks to Local Internet Registries (ISPs, large organizations). Everyone else gets IPs from their ISP.

ASN (Autonomous System Number) identifies a network under a single administrative entity for BGP routing purposes. AS15169 is Google. AS32934 is Facebook/Meta. AS13335 is Cloudflare. Every public IP belongs to exactly one ASN.

WHOIS data shows who registered a block of IPs with their RIR. Includes organization name, contact info, CIDR range, and allocation date. Larger organizations have more detail; individual ISPs usually show just the ISP name.

Geolocation accuracy:
- Country: very high (>95% accurate with good databases)
- Region/state: good for residential, variable for datacenter
- City: approximate — often shows registered ISP city, not actual user location
- Precise coordinates: rarely accurate beyond a few kilometers for residential; nearly always unreliable for VPN/proxy/datacenter

Reverse DNS (PTR): maps IP back to a domain name. For residential IPs, often shows a dynamic DNS name like static.123-45-67-89.example-isp.com. For servers, shows the server\u2019s hostname.

VPN and proxy detection: sophisticated services detect known VPN exit nodes and Tor relays. Basic IP lookup does not. This tool shows when an IP is in a known VPN range.

IPv6: much more complex than IPv4 due to subnet delegation and privacy extensions. Location accuracy is typically lower for IPv6 than for IPv4.

Privacy: IP address is personal data under GDPR. Don\u2019t log IPs unnecessarily, and respect user privacy in analytics. Users behind CGNAT, VPN, or proxies may not be who their IP suggests.

Compared to whatismyipaddress.com and similar lookup sites, this tool provides similar data in a cleaner interface with bulk lookup capability. Single lookups are equivalent; the bulk option makes this tool more useful for log analysis.

Compared to command-line whois and dig, this tool combines both plus geolocation in one interface. CLI is better for scripting and automation; this tool is better for interactive investigation.

Compared to commercial IP intelligence services (MaxMind, IPinfo paid tiers), free public lookup has less accurate geolocation and fewer enriched fields (proxy detection, malicious IP scores). For serious security work, paid services provide better data.