AS27357 Rackspace Hosting

RACKSPACE - Rackspace Hosting · registered in the United States

IPv4 addresses263,93636 prefixes · 0.008% of announced IPv4

Rank in United States#262largest network in US by IPv4 space, of 18,338 · 0.02% of US

Rank worldwide#902of 79,396 networks with IPv4

IPv61 x /32 (65,536 x /48)1 prefixes

CountryUnited States18,679 ASNs registered there

Open AS27357 in ASN lookup Look up an IP in this network (23.253.128.1) All networks in United States

IPv4 prefixes

All 36 prefixes, in address order.

23.253.128.0/19
65.61.141.0/24
65.61.142.0/23
65.61.146.0/23
65.61.152.0/24
65.61.186.0/23
69.20.0.0/18
69.20.64.0/19
69.20.96.0/19
72.4.112.0/20
74.205.0.0/19
104.130.0.0/18
104.130.120.0/22
104.130.160.0/19
104.130.224.0/20
104.239.160.0/19
104.239.224.0/20
104.239.248.0/21
142.0.184.0/22
146.20.0.0/16
156.43.59.0/24
159.135.64.0/20
159.135.254.0/24
162.209.96.0/19
162.242.192.0/18
172.99.64.0/19
173.203.128.0/18
173.204.89.0/24
192.68.40.0/24
198.210.16.0/21
204.51.224.0/24
204.51.235.0/24
204.232.128.0/18
204.232.224.0/19
207.97.192.0/18
209.0.201.0/24

IPv6 prefixes

All 1 prefix.

2001:4802::/32

Other ASNs named Rackspace Hosting

4 other networks use the same organisation name; together with AS27357 they announce 1,606,401 IPv4 addresses.

ASNNameIPv4 addresses

AS33070RMH-14 - Rackspace Hosting US798,961

AS19994RACKSPACE - Rackspace Hosting US537,088

AS12200RACKSPACE - Rackspace Hosting US5,904

AS54636AS-DBIO - Rackspace Hosting US512

Similar-sized networks in United States

ASNNameIPv4 addresses

AS1554#259 DNIC-ASBLK-01550-01601 - United States Department of Defense (DoD)266,496

AS5277#260 DNIC-ASBLK-05120-05376 - United States Department of Defense (DoD)265,472

AS370#261 DNIC-ASBLK-00306-00371 - United States Department of Defense (DoD)264,192

AS19902#263 NET-STATE-OHIO - Department of Administrative Services262,912

AS299#264 UCINET-AS - University of California, Irvine262,404

AS14298#265 EPA-NET - Environmental Protection Agency262,400

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