Skip to main content
WorldIP.io

Free IPv4 lookup — owner, ASN, geolocation, PTR

The complete IPv4 address space, mapped

Find the owner, ASN, country, city, reverse DNS, PTR records, and allocation history of any of the 4.3 billion IPv4 addresses. Search PTR hostnames to discover infrastructure. No signup, no API key.

Examples: 8.8.8.8 · 1.1.1.1 · AS15169 · United States · 🎲 Random IP
IPv4 addresses
3,687,451,632
CIDR ranges
4,006,940
Organizations
69,466
ASNs
77,563
Countries
250
Searches today
10,277

IPv4 allocation by country

Click any country to drill in. Colors scale logarithmically.

Top countries by IPv4 space

  1. 1 United States 1,514.97M
  2. 2 China 345.19M
  3. 3 Japan 199.72M
  4. 4 United Kingdom 135.10M
  5. 5 Germany 134.17M
  6. 6 South Korea 116.16M
  7. 7 Brazil 87.23M
  8. 8 France 83.58M
  9. 9 Canada 72.18M
  10. 10 Italy 57.33M

Top organizations

  1. 1 United States Department of Defense DoD 287.62M
  2. 2 Amazon.com, Inc. 172.93M
  3. 3 AT&T Enterprises, LLC 102.92M
  4. 4 Chinanet 100.94M
  5. 5 Verizon Business 86.90M
  6. 6 Comcast Cable Communications, LLC 68.17M
  7. 7 Microsoft Corporation 66.98M
  8. 8 CHINA UNICOM China169 Backbone 57.22M
  9. 9 Korea Telecom 46.38M
  10. 10 SoftBank Corp. 40.17M

Recent lookups

91.224.162.1 211.127.103.255 219.66.128.2 62.75.194.4 62.75.194.8 219.67.164.1 85.25.200.8 143.90.183.5 143.90.175.255 185.62.184.7 103.244.112.1 219.67.164.0

What you can do here

  • → IP address lookup — enter any IPv4 address (like 8.8.8.8) to see who owns it, their ASN, city, country, and reverse DNS.
  • → CIDR range lookup — understand how IP space is carved into subnets. Browse 8.8.8.0/24 to see all 256 IPs in Google's DNS block.
  • → ASN (autonomous system) lookup — trace BGP-routed prefixes back to their operator. AS15169 = Google. AS13335 = Cloudflare.
  • → Organization IP footprint — see every CIDR block an organization owns and which countries they operate in.
  • → Country-level IPv4 breakdown — browse top ISPs, hosting providers, and CDN footprints for each of 250 countries.
  • → IPv4 exhaustion tracking — see how much of the 4.3B IPv4 address space is allocated and the RIR-by-RIR breakdown.

How WorldIP.io works

WorldIP.io merges three authoritative IPv4 datasets — MaxMind GeoLite2 for city-level geolocation, RIR delegation files (ARIN, RIPE, APNIC, LACNIC, AfriNIC) for allocation ownership, and Team Cymru for ASN-to-organization mapping.

Every IPv4 address gets its own deep-linkable URL. When you visit /1.1.1.1, we look up the range containing that IP, show the owner (Cloudflare), the ASN (AS13335), the BGP-routed prefix, the MaxMind geolocation, the reverse DNS record, and the 16 neighboring IPs in the same /24 — all cross-linked.

Data refreshes weekly from MaxMind. Learn more on our data sources page or browse the FAQ.

Share