Free IPv4 Lookup — Owner, ASN, Geo, PTR — WorldIP.io
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Free IPv4 lookup — owner, ASN, geolocation, PTR
The complete IPv4 address space, mapped
Find the owner, ASN, country, state/region, city, reverse DNS, PTR records, and allocation history of any of the 4.3 billion IPv4 addresses. Search by IP, CIDR, ASN, organization, country, state, or city. No signup, no API key.
Lookup
Examples: 📍 My IP ·<br>8.8.8.8 ·<br>AS15169 ·<br>United States ·<br>Florida ·<br>Orlando ·<br>🎲 Random IP
126,698 searches today
IPv4 addresses
3,841,634,253
CIDR ranges
6,931,008
Organizations
73,284
ASNs
79,232
Countries
250
DNS records
894,074,661
IPv4 allocation by country
Click any country to drill in. Colors scale logarithmically.
Browse the database
IPv4 Ranges<br>Organizations<br>ASNs<br>Countries<br>RIRs<br>Categories<br>Live RIR feed →<br>Live BGP anomalies →<br>Web3 node map →
Top countries by IPv4 space →
United States
1,608.44M
China
349.42M
Japan
202.90M
Germany
139.75M
United Kingdom
137.51M
South Korea
123.19M
France
91.84M
Brazil
90.07M
Canada
73.50M
10<br>Italy
59.57M
Top states / regions
California
75.24M
England
66.63M
Virginia
52.97M
Texas
49.50M
New York
37.06M
Florida
33.93M
Tokyo
31.31M
São Paulo
26.74M
Seoul
25.12M
10
Ohio
23.75M
Top cities
Ashburn
25.90M
Tokyo
13.87M
Sydney
12.42M
São Paulo
12.10M
Frankfurt am Main
11.63M
Boardman
10.81M
Singapore
10.62M
Beijing
10.45M
Shanghai
10.25M
10
Dublin
9.98M
Top organizations →
United States Department of Defense DoD
582.69M
Amazon.com, Inc.
351.78M
AT&T Enterprises, LLC
217.53M
Chinanet
203.85M
Verizon Business
179.62M
Comcast Cable Communications, LLC
145.11M
Microsoft Corporation
138.71M
CHINA UNICOM China169 Backbone
115.40M
Korea Telecom
93.17M
10<br>Charter Communications, Inc
82.04M
Recent lookups
148.170.128.7<br>103.176.236.7<br>139.195.128.19<br>14.101.64.31<br>103.176.236.68<br>47.73.240.111<br>95.115.192.72<br>71.205.58.33<br>103.176.236.244<br>47.30.0.66<br>177.163.240.131<br>103.176.236.176
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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, state, and city breakdown — drill from 250 countries down through 3,000+ states/regions into 120,000+ cities to see top ISPs and IP allocations at every level.
→ 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.
Frequently Asked Questions<br>What is an IPv4 address?An IPv4 address is a 32-bit numeric identifier assigned to every device connected to the internet. Written as four numbers separated by dots (e.g., 8.8.8.8), there are approximately 4.3 billion possible IPv4 addresses. Each one is allocated to an organization, ISP, or government entity.<br>How do I look up who owns an IP address?Enter any IPv4 address in the search bar above. WorldIP.io shows the owning organization, ASN (Autonomous System Number), geographic location, CIDR range, and reverse DNS record for every allocated IPv4 address.<br>What is an ASN?An Autonomous System Number (ASN) identifies a network that independently manages its own routing policy. ISPs, cloud providers, and large enterprises each have one or more ASNs. WorldIP.io tracks over 79,232 active ASNs.<br>What is a CIDR range?CIDR (Classless Inter-Domain Routing) notation like...