AS55219 Cisco Systems, Inc.

SOURCEFIRE-LABS - Cisco Systems, Inc. · registered in the United States

IPv4 addresses1,5362 prefixes · <0.001% of announced IPv4

Rank in United States#6,864largest network in US by IPv4 space, of 18,338 · <0.01% of US

Rank worldwide#26,134of 79,396 networks with IPv4

IPv617 x /486 prefixes

CountryUnited States18,679 ASNs registered there

Open AS55219 in ASN lookup Look up an IP in this network (172.110.204.1) All networks in United States

IPv4 prefixes

All 2 prefixes, in address order.

172.110.204.0/22
198.148.78.0/23

IPv6 prefixes

All 6 prefixes.

2620:28:c000::/48
2620:121::/46
2620:121:4::/48
2620:121:5::/48
2620:121:6::/47
2620:121:8::/45

Other ASNs named Cisco Systems, Inc.

4 other networks use the same organisation name; together with AS55219 they announce 1,149,184 IPv4 addresses.

ASNNameIPv4 addresses

AS109CISCOSYSTEMS - CISCO SYSTEMS, INC. US1,141,504

AS398699WCCE - Cisco Systems Inc US3,072

AS396922TGRID-AS - Cisco Systems, Inc. US2,560

AS36519CISCO-TTNA - CISCO SYSTEMS, INC. US512

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ASNNameIPv4 addresses

AS53698#6861 NINJA-IX-TRANSIT-CONNECTION - Ninja-IX Corporation1,536

AS54286#6862 AS-TAIPEI-ARIN - TAIPEI101 NETWORK LLC1,536

AS33309#6863 HELIACAL - Heliacal Networks1,536

AS215039#6865 nodesty Nodesty LLC1,536

AS154859#6866 KINETLLC-AS-US - Kinet LLC1,536

AS396881#6867 DRSERVER1 - drServer.net1,536

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