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AS1637 Headquarters, USAISC

DNIC-AS-01637 - Headquarters, USAISC · registered in the United States

IPv4 addresses201,728119 prefixes · 0.006% of announced IPv4
Rank in United States#317largest network in US by IPv4 space, of 18,338 · 0.01% of US
Rank worldwide#1,074of 79,396 networks with IPv4
IPv61 x /481 prefixes
CountryUnited States18,679 ASNs registered there
Open AS1637 in ASN lookup Look up an IP in this network (6.16.88.1) All networks in United States

IPv4 prefixes

All 119 prefixes, in address order.

  • 6.16.88.0/23
  • 6.134.24.0/22
  • 143.46.0.0/22
  • 143.46.4.0/23
  • 143.46.6.0/23
  • 143.46.8.0/21
  • 143.46.16.0/20
  • 143.46.32.0/21
  • 143.46.40.0/21
  • 143.46.48.0/22
  • 143.46.52.0/23
  • 143.46.54.0/23
  • 143.46.56.0/22
  • 143.46.60.0/24
  • 143.46.61.0/24
  • 143.46.62.0/23
  • 143.46.64.0/19
  • 143.46.96.0/21
  • 143.46.104.0/22
  • 143.46.108.0/23
  • 143.46.110.0/24
  • 143.46.111.0/24
  • 143.46.112.0/20
  • 143.46.128.0/21
  • 143.46.136.0/21
  • 143.46.144.0/21
  • 143.46.152.0/22
  • 143.46.156.0/23
  • 143.46.158.0/24
  • 143.46.159.0/24
  • 143.46.160.0/23
  • 143.46.162.0/23
  • 143.46.164.0/22
  • 143.46.168.0/21
  • 143.46.176.0/21
  • 143.46.184.0/22
  • 143.46.188.0/23
  • 143.46.190.0/24
  • 143.46.191.0/24
  • 143.46.192.0/20
  • 143.46.208.0/23
  • 143.46.210.0/24
  • 143.46.211.0/24
  • 143.46.212.0/22
  • 143.46.216.0/21
  • 143.46.224.0/22
  • 143.46.228.0/23
  • 143.46.230.0/23
  • 143.46.232.0/21
  • 143.46.240.0/24
  • 143.46.241.0/24
  • 143.46.242.0/23
  • 143.46.244.0/22
  • 143.46.248.0/22
  • 143.46.252.0/23
  • 143.46.254.0/23
  • 143.68.152.0/21
  • 147.248.24.0/24
  • 155.5.0.0/20
  • 155.5.16.0/23
  • 155.5.18.0/24
  • 155.5.19.0/24
  • 155.5.20.0/22
  • 155.5.24.0/21
  • 155.5.32.0/22
  • 155.5.36.0/22
  • 155.5.40.0/21
  • 155.5.48.0/20
  • 155.5.64.0/19
  • 155.5.96.0/20
  • 155.5.112.0/22
  • 155.5.116.0/24
  • 155.5.117.0/24
  • 155.5.118.0/23
  • 155.5.120.0/21
  • 155.5.128.0/20
  • 155.5.144.0/20
  • 155.5.160.0/19
  • 155.5.192.0/18
  • 155.6.0.0/19
  • 155.6.32.0/22
  • 155.6.36.0/23
  • 155.6.38.0/23
  • 155.6.40.0/21
  • 155.6.48.0/24
  • 155.6.49.0/24
  • 155.6.50.0/23
  • 155.6.52.0/23
  • 155.6.54.0/23
  • 155.6.56.0/21
  • 155.6.64.0/19
  • 155.6.96.0/23
  • 155.6.98.0/24
  • 155.6.99.0/24
  • 155.6.100.0/22
  • 155.6.104.0/21
  • 155.6.112.0/20
  • 155.6.128.0/18
  • 155.6.192.0/21
  • 155.6.200.0/24
  • 155.6.201.0/24
  • 155.6.202.0/23
  • 155.6.204.0/22
  • 155.6.208.0/23
  • 155.6.210.0/24
  • 155.6.211.0/24
  • 155.6.212.0/22
  • 155.6.216.0/22
  • 155.6.220.0/24
  • 155.6.221.0/24
  • 155.6.222.0/23
  • 155.6.224.0/20
  • 155.6.240.0/22
  • 155.6.244.0/22
  • 155.6.248.0/21
  • 155.20.102.0/23
  • 155.20.105.0/24
  • 155.20.109.0/24
  • 192.172.29.0/24

IPv6 prefixes

All 1 prefix.

  • 2608:c141:30::/48

Other ASNs named Headquarters, USAISC

26 other networks use the same organisation name; together with AS1637 they announce 9,863,936 IPv4 addresses.

ASNNameIPv4 addresses
AS1540DNIC-ASBLK-01534-01546 - Headquarters, USAISC US7,430,144
AS4010DNIC-AS-04010 - Headquarters, USAISC US1,175,808
AS1602DNIC-AS-01602 - Headquarters, USAISC US199,936
AS1649DNIC-AS-01649 - Headquarters, USAISC US131,584
AS1530DNIC-ASBLK-01529-01530 - Headquarters, USAISC US131,072
AS1493DNIC-ASBLK-01492-01493 - Headquarters, USAISC US119,808
AS289DNIC-AS-00289 - Headquarters, USAISC US88,320
AS1516DNIC-ASBLK-01513-01518 - Headquarters, USAISC US86,016
AS13DNIC-AS-00013 - Headquarters, USAISC US79,104
AS252DNIC-AS-00252 - Headquarters, USAISC US69,120
AS747DNIC-AS-00747 - Headquarters, USAISC US68,864
AS1501DNIC-ASBLK-01500-01502 - Headquarters, USAISC US41,984
AS213DNIC-AS-00213 - Headquarters, USAISC US32,768
AS588DIRECTRON - Headquarters, USAISC US4,096
AS153CTNOSC-ASN-153 - Headquarters, USAISC US512
AS258BRAGGSRI-EGP-AS - Headquarters, USAISC US512
AS538DNIC-AS-00538 - Headquarters, USAISC US512
AS1544DNIC-ASBLK-01534-01546 - Headquarters, USAISC US512
AS1508DNIC-AS-01508 - Headquarters, USAISC US256
AS670DNIC-AS-00670 - Headquarters, USAISC US256
AS672DNIC-AS-00672 - Headquarters, USAISC US256
AS673DNIC-AS-00673 - Headquarters, USAISC US256
AS1492DNIC-ASBLK-01492-01493 - Headquarters, USAISC US256
AS1523DNIC-ASBLK-01522-01526 - Headquarters, USAISC US256
AS575DNIC-AS-00575 - Headquarters, USAISC USIPv6 only
AS1542DNIC-ASBLK-01534-01546 - Headquarters, USAISC USIPv6 only

Similar-sized networks in United States

ASNNameIPv4 addresses
AS398823#314 PEG-LA - PEG TECH INC207,104
AS1742#315 HARVARD-UNIV - Harvard University203,520
AS36850#316 UNC-CH - University of North Carolina at Chapel Hill203,264
AS400619#318 AROSS-AS - AROSSCLOUD INC.201,472
AS6431#319 ATT-RESEARCH - AT&T Enterprises, LLC200,192
AS25#320 UCB - University of California at Berkeley199,940

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