AS33071 Internet Systems Consortium, Inc.

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

IPv4 addresses2561 prefixes · <0.001% of announced IPv4

Rank in United States#13,363largest network in US by IPv4 space, of 18,338 · <0.01% of US

Rank worldwide#61,189of 79,396 networks with IPv4

IPv61 x /481 prefixes

CountryUnited States18,679 ASNs registered there

Open AS33071 in ASN lookup Look up an IP in this network (199.6.0.1) All networks in United States

IPv4 prefixes

All 1 prefix, in address order.

199.6.0.0/24

IPv6 prefixes

All 1 prefix.

2001:500:71::/48

Other ASNs named Internet Systems Consortium, Inc.

6 other networks use the same organisation name; together with AS33071 they announce 37,120 IPv4 addresses.

ASNNameIPv4 addresses

AS1280ISC-AS-1280 - Internet Systems Consortium, Inc. US23,296

AS30133ISC-F-AS - Internet Systems Consortium, Inc. US9,984

AS27321ISC-F-AS - Internet Systems Consortium, Inc. US2,048

AS30132ISC-F-AS - Internet Systems Consortium, Inc. US768

AS3557ISC-AS - Internet Systems Consortium, Inc. US512

AS23713ISC-SEL1 - Internet Systems Consortium, Inc. KR256

Similar-sized networks in United States

ASNNameIPv4 addresses

AS32550#13360 EQUINIX-EC-SE - Equinix, Inc.256

AS32764#13361 CPN - CSN Support Services256

AS32993#13362 SIMONSFOUNDATION-FI - The Simons Foundation, Inc.256

AS33191#13364 NOTION-WEB - Notion Labs, Inc.256

AS33228#13365 SOFTIRON-ASN-SJC - SoftIron256

AS33246#13366 BLC-AS - Bethany Lutheran College256

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