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AS30133 Internet Systems Consortium, Inc.

ISC-F-AS - Internet Systems Consortium, Inc. · registered in the United States

IPv4 addresses9,98424 prefixes · <0.001% of announced IPv4
Rank in United States#2,964largest network in US by IPv4 space, of 18,338 · <0.01% of US
Rank worldwide#9,121of 79,396 networks with IPv4
IPv643 x /4824 prefixes
CountryUnited States18,679 ASNs registered there
Open AS30133 in ASN lookup Look up an IP in this network (103.11.221.1) All networks in United States

IPv4 prefixes

All 24 prefixes, in address order.

  • 103.11.221.0/24
  • 192.158.250.0/23
  • 192.228.80.0/22
  • 192.228.84.0/23
  • 192.228.87.0/24
  • 192.228.92.0/24
  • 199.6.8.0/22
  • 199.6.12.0/23
  • 199.6.14.0/24
  • 199.253.63.0/24
  • 199.253.181.0/24
  • 200.93.240.0/22
  • 200.93.244.0/23
  • 200.93.246.0/24
  • 202.41.140.0/24
  • 202.41.142.0/23
  • 202.41.144.0/24
  • 202.41.146.0/24
  • 203.119.16.0/23
  • 203.119.19.0/24
  • 203.119.20.0/24
  • 203.119.51.0/24
  • 203.119.57.0/24
  • 203.119.79.0/24

IPv6 prefixes

All 24 prefixes.

  • 2001:500:61::/48
  • 2001:500:62::/47
  • 2001:500:64::/46
  • 2001:500:68::/47
  • 2001:500:6a::/48
  • 2001:500:6c::/47
  • 2001:500:6e::/48
  • 2001:500:70::/48
  • 2001:500:72::/47
  • 2001:500:74::/46
  • 2001:500:78::/46
  • 2001:500:99::/48
  • 2001:500:9a::/47
  • 2001:dd8:13::/48
  • 2001:dd8:14::/47
  • 2001:dd8:17::/48
  • 2001:dd8:18::/47
  • 2001:dd8:1a::/48
  • 2001:dd8:1c::/47
  • 2001:dd8:1e::/48
  • 2001:dd8:22::/48
  • 2001:13c7:7005::/48
  • 2001:13c7:7006::/47
  • 2001:13c7:7008::/47

Other ASNs named Internet Systems Consortium, Inc.

6 other networks use the same organisation name; together with AS30133 they announce 37,120 IPv4 addresses.

ASNNameIPv4 addresses
AS1280ISC-AS-1280 - Internet Systems Consortium, Inc. US23,296
AS27321ISC-F-AS - Internet Systems Consortium, Inc. US2,048
AS30132ISC-F-AS - Internet Systems Consortium, Inc. US768
AS3557ISC-AS - Internet Systems Consortium, Inc. US512
AS33071ISC-F-AS - Internet Systems Consortium, Inc. US256
AS23713ISC-SEL1 - Internet Systems Consortium, Inc. KR256

Similar-sized networks in United States

ASNNameIPv4 addresses
AS397913#2961 ESU-AS - East Stroudsburg University of Pennsylvania9,984
AS11572#2962 SS-ATL - PhoenixNAP LLC9,984
AS1610#2963 CONTE-25-ASN - Contegix9,984
AS16766#2965 ISLAND-TECHNOLOGY-INC - Island Technology, Inc.9,984
AS8068#2966 MICROSOFT-CORP-MSN-AS-BLOCK - Microsoft Corporation9,984
AS6373#2967 OPUS1 - Opus One9,984

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