Help / IP / ASN lookup
IP / ASN lookup
Shows which network owns an IP address and the range it belongs to, or every address range a network (ASN) announces.
How to use it
- Open the page to see your own IP’s network, or type an IP address, an AS number (AS13335 or just 13335) or a hostname.
- For an IP you get its network, the routed range it sits in, and where that network is registered.
- Click a network to see every range it announces.
Reading the results
- ASN
- Autonomous System Number: the ID of a network on the internet, such as an ISP, cloud or large company. AS13335 is Cloudflare.
- Routed range
- The block of addresses the network announces to the rest of the internet. Your IP is one address in it.
- Registered in
- The country the network registered with its regional registry. Servers can be anywhere.
- Not routed
- No network is announcing the address right now, so traffic to it goes nowhere.
- CIDR
- Short form for a range, like 192.0.2.0/24 (256 addresses).
Examples
- 8.8.8.8 Google’s public DNS
- AS13335 Every range Cloudflare announces
- github.com The networks behind a hostname
From the command line
curl "https://tools.nexayori.com/asn?q=8.8.8.8" curl "https://tools.nexayori.com/asn?q=8.8.8.8&format=json"
| q | IP address, AS number (AS13335 or 13335) or hostname; empty = your own IP |
| format | text (default for curl), json, or html |
Questions
How is this different from WHOIS?
WHOIS shows who registered an address block, with contacts. This shows who is routing it on the internet right now, and is instant.
How current is it?
The data is a public snapshot of internet routing, refreshed monthly. Ranges that changed hands in the last few weeks may show the previous network.
Where does the data come from?
iptoasn.com’s public-domain dataset, kept on our own servers. Lookups don’t go to any outside service.
Limitations
- Monthly snapshot, so very recent routing changes may not show yet.
- Large networks list at most 4,000 ranges per address family.