From an IP get an AS Number, IP range and name

When using IP to ASN enter an IP address or a list of IP addresses. The results will be a comma separated list of ASN’s with details.

An autonomous system is a collection of IP routing prefixes. The AS numbers and associated BGP routing is what makes the Internet work. It is how your packet gets from your local ISP to Google, Amazon or the cat videos hosted on the other side of the world.

Get ASN details

Find IP ranges contained within an AS

Enter an AS number with AS as the prefix. For example Google has an AS number 15169, enter this as AS15169.


Enter an IP address or host name to test

List of ASN by IP count (top 50 ASNs)

ASNNameNum IPs
AS7018AT&T Services, Inc.97,467,392
AS721DoD Network Information Center89,109,248
AS7922Comcast Cable Communications, LLC71,229,952
AS3356Level 3 Parent, LLC44,713,472
AS701MCI Communications Services, Inc. d/b/a Verizon Business43,088,384
AS71Hewlett-Packard Company33,719,552
AS6167Cellco Partnership DBA Verizon Wireless30,079,744
AS174Cogent Communications28,490,752
AS16509Amazon.com, Inc.23,219,968
AS8075Microsoft Corporation21,563,648
AS209CenturyLink Communications, LLC20,831,744
AS237Merit Network Inc.17,911,808
AS2686AT&T Global Network Services, LLC17,770,240
AS7377University of California, San Diego17,049,856
AS3Massachusetts Institute of Technology16,984,064
AS714Apple Inc.16,798,976
AS80General Electric Company16,777,216
AS22394Cellco Partnership DBA Verizon Wireless13,387,264
AS35994Akamai Technologies, Inc.12,784,128
AS21928T-Mobile USA, Inc.12,682,496
AS5650Frontier Communications of America, Inc.12,591,360
AS7029Windstream Communications LLC12,572,928
AS22773Cox Communications Inc.12,186,112
AS14618Amazon.com, Inc.11,899,648
AS6389BellSouth.net Inc.11,636,224
AS4249Eli Lilly and Company11,534,592
AS20115Charter Communications11,241,728
AS306DoD Network Information Center9,569,024
AS3561CenturyLink Communications, LLC9,096,448
AS15169Google LLC8,699,648
AS20057AT&T Mobility LLC8,667,904
AS10796Time Warner Cable Internet LLC8,027,136
AS10507Sprint Personal Communications Systems7,985,152
AS2914NTT America, Inc.7,173,120
AS2828MCI Communications Services, Inc. d/b/a Verizon Business6,892,800
AS33363Charter Communications, Inc6,839,552
AS20001Time Warner Cable Internet LLC6,772,480
AS3549Level 3 Parent, LLC6,605,824
AS702MCI Communications Services, Inc. d/b/a Verizon Business6,434,560
AS4323tw telecom holdings, inc.6,177,024
AS1668AOL Transit Data Network5,807,360
AS6128Cablevision Systems Corp.5,216,000
AS11351Time Warner Cable Internet LLC5,134,336
AS11427Time Warner Cable Internet LLC5,086,720
AS11003The Procter and Gamble Company4,689,408
AS16625Akamai Technologies, Inc.4,681,728
AS1541Headquarters, USAISC4,656,640
AS11426Time Warner Cable Internet LLC4,625,408
AS36351SoftLayer Technologies Inc.4,601,344
AS3360Computer Sciences Corporation4,198,912
AS7015Comcast Cable Communications, LLC4,113,920
AS385Air Force Systems Networking3,801,856
AS33491Comcast Cable Communications, LLC3,796,224
AS12271Time Warner Cable Internet LLC3,254,016