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AS19994 Rackspace Hosting

RACKSPACE - Rackspace Hosting · registered in the United States

IPv4 addresses537,08860 prefixes · 0.017% of announced IPv4
Rank in United States#159largest network in US by IPv4 space, of 18,338 · 0.04% of US
Rank worldwide#549of 79,396 networks with IPv4
IPv61 x /32 (65,536 x /48)1 prefixes
CountryUnited States18,679 ASNs registered there
Open AS19994 in ASN lookup Look up an IP in this network (23.253.0.1) All networks in United States

IPv4 prefixes

All 60 prefixes, in address order.

  • 23.253.0.0/18
  • 23.253.160.0/19
  • 23.253.192.0/19
  • 50.56.0.0/17
  • 50.57.0.0/17
  • 50.57.128.0/18
  • 50.57.192.0/19
  • 50.57.224.0/20
  • 64.49.232.0/23
  • 66.216.116.0/23
  • 67.207.128.0/19
  • 69.170.128.0/20
  • 74.120.216.0/22
  • 74.200.192.0/18
  • 104.130.64.0/19
  • 104.130.96.0/20
  • 104.130.112.0/21
  • 104.130.192.0/19
  • 104.239.192.0/19
  • 108.166.0.0/18
  • 108.166.96.0/19
  • 108.171.160.0/20
  • 134.8.2.0/24
  • 146.88.100.0/22
  • 146.88.112.0/22
  • 146.88.120.0/22
  • 147.75.8.0/21
  • 161.47.0.0/16
  • 162.209.0.0/18
  • 162.209.80.0/20
  • 162.216.40.0/22
  • 162.242.160.0/19
  • 166.78.64.0/18
  • 166.78.192.0/18
  • 173.45.224.0/20
  • 173.45.240.0/21
  • 173.203.0.0/17
  • 184.106.0.0/19
  • 184.106.32.0/20
  • 184.106.48.0/22
  • 184.106.52.0/23
  • 184.106.54.0/24
  • 184.106.56.0/21
  • 184.106.64.0/18
  • 184.106.128.0/17
  • 192.237.128.0/18
  • 192.237.224.0/19
  • 198.61.128.0/18
  • 198.61.224.0/19
  • 198.101.128.0/18
  • 198.254.72.0/21
  • 199.180.184.0/22
  • 199.253.200.0/23
  • 204.9.188.0/24
  • 204.13.108.0/22
  • 204.51.170.0/24
  • 208.78.96.0/21
  • 209.20.64.0/19
  • 209.61.166.0/23
  • 216.18.148.0/22

IPv6 prefixes

All 1 prefix.

  • 2001:4801::/32

Other ASNs named Rackspace Hosting

4 other networks use the same organisation name; together with AS19994 they announce 1,606,401 IPv4 addresses.

ASNNameIPv4 addresses
AS33070RMH-14 - Rackspace Hosting US798,961
AS27357RACKSPACE - Rackspace Hosting US263,936
AS12200RACKSPACE - Rackspace Hosting US5,904
AS54636AS-DBIO - Rackspace Hosting US512

Similar-sized networks in United States

ASNNameIPv4 addresses
AS2379#156 CENTURYLINK-LEGACY-EMBARQ-WNPK - CenturyLink Communications, LLC547,840
AS19773#157 MOTOROLA-SOLUTIONS - Motorola, Inc.545,280
AS10430#158 WA-K20 - Washington State K-20 Telecommunications Network539,136
AS3598#160 MICROSOFT-CORP-AS - Microsoft Corporation531,200
AS7726#161 FITC-AS - FedEx Internet Technologies Corporation531,200
AS5852#162 DNIC-ASBLK-05800-06055 - United States Department of Defense (DoD)526,592

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