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AS19905Arbor Cloud

United StatesRegistryARIN

As of 11th November 2026, AS19905 (Arbor Cloud), a network registered in the United States with ARIN, originates 141 IPv4 prefixes covering 38.7k addresses and 26 IPv6 prefixes. By IPv4 address space that makes it the 5,059th-largest of the 80,747 networks we see originating IPv4, and the 1,758th-largest of 18,752 in the United States. It is seen behind 8 upstream networks, most often AS2914 (NTT America, Inc.) and AS6453 (TATA Communications (America) Inc), and in front of 35 downstream networks. 32% of its announcements have a valid RPKI ROA, and none are RPKI-invalid. 90% of its routes reach at least 90% of full-feed peers, and 18 prefixes are also originated by another network.

At a glance

IPv4 prefixes

141

IPv6 prefixes

26

IPv4 addresses

38.7k

IPv6 /64s

1.7M

Upstream graph

The networks AS19905 is seen behind, one and two hops out, drawn from real AS paths.

AS19905Toward the internet core
Upstream graph for AS19905: 12 neighbouring networks observed beyond it across 2 levels. The same networks are listed in the tables below.AS19905Arbor CloudThis networkAS260GTT Americas, LLCAS2914NTT America, Inc.AS3257GTT Communication…AS6453TATA Communicatio…AS6461Zayo BandwidthAS49544i3D.net B.VAS215859Hetzner Cloud - S…AS6667Elisa OyjAS398465Rackdog LLCAS8220COLTAS35280F5 Networks SARLAS32590Valve Corporation

Networks observed one and two hops upstream of AS19905 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

91

adjacent networks

Upstreams
89%
Peers
4853%
Downstreams
3538%

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

Upstreams of AS19905
NetworkCountryRelationshipPathsVantage pts
AS2914NTT America, Inc.USPeer9,795138
AS6453TATA Communications (America) IncUSPeer9,78590
AS3257GTT Communications Inc.USPeer6,789102
AS6461Zayo BandwidthUSPeer1,74199
AS260GTT Americas, LLCUSPeer83267
AS4637Telstra International LimitedHKPeer12686
AS12956Telxius (Telefonica Global)ESPeer22
AS15830Equinix, Inc.NLPeer11

Prefixes

All 167

The largest blocks AS19905 originates, widest first.

Largest prefixes originated by AS19905
PrefixAddressesVisibility
139.104.72.0/212k62/76
156.154.164.0/2351276/76
217.173.88.0/2351276/76
217.173.92.0/2351276/76
5.36.169.0/242564/76
12.51.26.0/2425676/76
24.248.247.0/2425673/76
37.224.77.0/2425676/76
46.184.44.0/2425615/76
66.198.240.0/242561/76

Routing health

How AS19905'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

  • Valid32.3%54
  • Invalid0.0%0
  • No ROA67.7%113

Propagation

  • Globally propagated90% of full-feed peers or more89.8%150
  • Partially propagated40% to 90%3.6%6
  • Seen by few peersUnder 40%6.6%11

Prefix sizes

IPv4 — 141 prefixes

IPv6 — 26 prefixes

  • /4865.5k × /64100.0%26

Recent changes

Announcements that started or stopped since 12th Oct 2026.

  • Announced204.74.99.0/2411th Nov 2026
  • Announced213.5.171.0/2411th Nov 2026
  • Announced46.184.19.0/2411th Nov 2026
  • Withdrawn46.184.19.0/2411th Nov 2026
  • Withdrawn204.74.99.0/2410th Nov 2026
  • Announced204.74.99.0/2410th Nov 2026
  • Announced46.184.41.0/249th Nov 2026
  • Withdrawn46.184.41.0/249th Nov 2026
  • Withdrawn188.249.168.0/248th Nov 2026
  • Announced46.184.18.0/248th Nov 2026
  • Withdrawn46.184.18.0/248th Nov 2026
  • Withdrawn46.184.20.0/248th Nov 2026

113 announced and 105 withdrawn in all; the most recent are shown.

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