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United States
Networks in the United States
18,679 autonomous systems are registered in the United States (US). Together they announce 1,362,791,673 IPv4 addresses, 43.49% of the announced total, which ranks the United States #1 of 240 countries.
Autonomous systems 18,679 18,338 announce IPv4, 341 IPv6 only
IPv4 addresses 1,362,791,673 43.49% of announced IPv4 · #1 worldwide
Top 5 networks hold 43.5% of United States's IPv4 space
IPv6 26,070 x /32 (1,708,542,574 x /48) 5064 of 18679 networks (27%) announce IPv6
Small networks 5,606 announce a single /24 (256 addresses) or less
Top 50 networks in United States by IPv4 space
# ASN Network IPv4 addresses Of US
1
AS749 DNIC-AS-00749 - United States Department of Defense (DoD)
222,038,272
16.29%
2
AS16509 AMAZON-02 - Amazon.com, Inc.
157,393,150
11.55%
3
AS7018 ATT-INTERNET4 - AT&T Enterprises, LLC
90,002,688
6.60%
4
AS8075 MICROSOFT-CORP-MSN-AS-BLOCK - Microsoft Corporation
80,749,056
5.93%
5
AS7922 COMCAST-7922 - Comcast Cable Communications, LLC
42,195,200
3.10%
6
AS701 UUNET - Verizon Business
40,608,768
2.98%
7
AS721 DNIC-ASBLK-00721-00726 - United States Department of Defense (DoD)
29,541,376
2.17%
8
AS3356 LEVEL3 - Level 3 Parent, LLC
27,412,864
2.01%
9
AS174 COGENT-174 - Cogent Communications, LLC
24,663,935
1.81%
10
AS396982 GOOGLE-CLOUD-PLATFORM - Google LLC
22,019,072
1.62%
11
AS14618 AMAZON-AES - Amazon.com, Inc.
21,573,120
1.58%
12
AS6167 CELLCO-PART - Verizon Business
18,082,816
1.33%
13
AS714 APPLE-ENGINEERING - Apple Inc.
16,915,200
1.24%
14
AS209 CENTURYLINK-US-LEGACY-QWEST - CenturyLink Communications, LLC
15,739,648
1.15%
15
AS21928 T-MOBILE-AS21928 - T-Mobile USA, Inc.
13,121,792
0.96%
16
AS22773 ASN-CXA-ALL-CCI-22773-RDC - Cox Communications Inc.
12,937,472
0.95%
17
AS20115 CHARTER-20115 - Charter Communications LLC
12,417,536
0.91%
18
AS22394 CELLCO - Verizon Business
12,308,992
0.90%
19
AS7377 UCSD - University of California, San Diego
12,126,474
0.89%
20
AS5650 FRONTIER-FRTR - Frontier Communications of America, Inc.
10,665,984
0.78%
21
AS7029 WINDSTREAM - Windstream Communications LLC
10,421,504
0.76%
22
AS56 DNIC-AS-00056 - United States Department of Defense (DoD)
7,785,728
0.57%
23
AS1540 DNIC-ASBLK-01534-01546 - Headquarters, USAISC
7,430,144
0.55%
24
AS10796 TWC-10796-MIDWEST - Charter Communications Inc
7,405,568
0.54%
25
AS20001 TWC-20001-PACWEST - Charter Communications Inc
7,210,752
0.53%
26
AS2828 XO-AS15 - Verizon Business
6,535,680
0.48%
27
AS3561 CENTURYLINK-LEGACY-SAVVIS - CenturyLink Communications, LLC
6,397,952
0.47%
28
AS11427 TWC-11427-TEXAS - Charter Communications Inc
5,789,696
0.42%
29
AS31898 ORACLE-BMC-31898 - Oracle Corporation
5,754,624
0.42%
30
AS702 UUNET - Verizon Business
5,716,992
0.42%
31
AS33363 BHN-33363 - Charter Communications, Inc
5,679,360
0.42%
32
AS6128 CABLE-NET-1 - Cablevision Systems Corp.
4,867,584
0.36%
33
AS2914 NTT-DATA-2914 - NTT America, Inc.
4,832,292
0.35%
34
AS6079 RCN-AS - RCN
4,697,856
0.34%
35
AS3549 LVLT-3549 - Level 3 Parent, LLC
4,521,728
0.33%
36
AS306 DNIC-ASBLK-00306-00371 - United States Department of Defense (DoD)
4,492,288
0.33%
37
AS11426 TWC-11426-CAROLINAS - Charter Communications Inc
4,389,888
0.32%
38
AS11351 TWC-11351-NORTHEAST - Charter Communications Inc
4,317,440
0.32%
39
AS6389 BELLSOUTH-NET-BLK - AT&T Enterprises, LLC
4,237,056
0.31%
40
AS16625 AKAMAI-AS - Akamai Technologies, Inc.
4,118,016
0.30%
41
AS3257 GTT-BACKBONE GTT Communications Inc.
4,103,936
0.30%
42
AS11003 PANDG - The Procter and Gamble Company
4,090,624
0.30%
43
AS20057 ATT-MOBILITY-LLC-AS20057 - AT&T Enterprises, LLC
3,979,776
0.29%
44
AS36351 SOFTLAYER - IBM Cloud
3,642,112
0.27%
45
AS4249 LILLY-AS - Eli Lilly and Company
3,342,336
0.25%
46
AS14061 DIGITALOCEAN-ASN - DigitalOcean, LLC
3,150,845
0.23%
47
AS4155 USDA-1 - USDA
3,147,776
0.23%
48
AS33491 COMCAST-33491 - Comcast Cable Communications, LLC
3,142,144
0.23%
49
AS19901 BRIGHTSPEED - Brightspeed
3,011,840
0.22%
50
AS12271 TWC-12271-NYC - Charter Communications Inc
2,859,008
0.21%
Countries of similar size
IP-to-ASN data: iptoasn.com (public domain). Snapshot downloaded 2026-11-11, refreshed daily. Ranges are what each network announces in BGP, not registry allocations. Data sources