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AS27357Rackspace Hosting

United StatesRegistryARIN

As of 24th October 2026, AS27357 (Rackspace Hosting), a network registered in the United States with ARIN, originates 39 IPv4 prefixes covering 266k addresses and 1 IPv6 prefix. By IPv4 address space that makes it the 1,064th-largest of the 79,642 networks we see originating IPv4, and the 281st-largest of 18,487 in the United States. It is seen behind 1 upstream network, most often AS12200 (Rackspace Hosting), and in front of 1 downstream network. 3% of its announcements have a valid RPKI ROA, and none are RPKI-invalid. 93% of its routes reach at least 90% of full-feed peers, and 3 prefixes are also originated by another network.

At a glance

IPv4 prefixes

39

IPv6 prefixes

1

IPv4 addresses

266k

IPv6 /64s

4.3B

Upstream graph

The networks AS27357 is seen behind, one and two hops out, drawn from real AS paths.

AS27357Toward the internet core
Upstream graph for AS27357: 3 neighbouring networks observed beyond it across 2 levels. The same networks are listed in the tables below.AS27357Rackspace HostingThis networkAS12200Rackspace HostingAS1299Arelion (fka. Tel…AS6461Zayo Bandwidth

Networks observed one and two hops upstream of AS27357 in real AS paths. A thicker line means more vantage points saw that adjacency, so weight tracks how well attested it is — not how much traffic it carries. Adjacency is an observation; whether it is a transit purchase or a settlement-free peering is an inference, and is labelled as one wherever we show it.

Neighbouring networks

4

adjacent networks

Upstreams
125%
Peers
250%
Downstreams
125%

Networks carrying this one's traffic toward the rest of the internet.

Upstreams of AS27357
NetworkCountryRelationshipPathsVantage pts
AS12200Rackspace HostingUSPeer4,715138

Prefixes

All 40

The largest blocks AS27357 originates, widest first.

Largest prefixes originated by AS27357
PrefixAddressesVisibility
146.20.0.0/1665.5k75/76
69.20.0.0/1732.8k75/76
104.130.0.0/1816.4k75/76
173.203.128.0/1816.4k75/76
204.232.128.0/1816.4k75/76
207.97.192.0/1816.4k75/76
23.253.128.0/198.2k75/76
74.205.0.0/198.2k75/76
104.130.160.0/198.2k75/76
104.239.160.0/198.2k75/76

Routing health

How AS27357's own announcements validate against RPKI and how far they propagate. The same measures for the whole routing table are on the routing table in numbers.

RPKI origin validation

  • Valid2.5%1
  • Invalid0.0%0
  • No ROA97.5%39

Propagation

  • Globally propagated90% of full-feed peers or more92.5%37
  • Partially propagated40% to 90%2.5%1
  • Seen by few peersUnder 40%5.0%2

Prefix sizes

IPv4 — 39 prefixes

IPv6 — 1 prefixes

  • /324.3B × /64100.0%1

Recent changes

Announcements that started or stopped since 24th Sept 2026.

No announcement by AS27357 started or stopped in this period.

Routing data derived from RouteViews MRT archives, BGPKIT relationship inference and public registry data.