subnet.im

AS23520Columbus Networks USA, Inc.

United StatesRegistryARINTypeCarrier

As of 10th November 2026, AS23520 (Columbus Networks USA, Inc.), a transit carrier registered in the United States with ARIN, originates 125 IPv4 prefixes covering 441k addresses and 2 IPv6 prefixes. By IPv4 address space that makes it the 782nd-largest of the 80,723 networks we see originating IPv4, and the 197th-largest of 18,750 in the United States. It is seen behind 21 upstream networks, most often AS1299 (Arelion (fka. Telia Carrier)) and AS6830 (Liberty Global Europe Holding B.V.), and in front of 192 downstream networks. 70% of its announcements have a valid RPKI ROA; 2 are RPKI-invalid. 85% of its routes reach at least 90% of full-feed peers.

At a glance

IPv4 prefixes

125

IPv6 prefixes

2

IPv4 addresses

441k

IPv6 /64s

8.6B

Upstream graph

The networks AS23520 is seen behind, one and two hops out, drawn from real AS paths.

AS23520Toward the internet core
Upstream graph for AS23520: 12 neighbouring networks observed beyond it across 2 levels. The same networks are listed in the tables below.AS23520Columbus Networks…This networkAS174Cogent Communicat…AS1299Arelion (fka. Tel…AS3257GTT Communication…AS6762Telecom Italia Sp…AS6830Liberty Global Eu…AS151326DCConnect Communi…AS13030Init7 (Switzerlan…AS16552Tiggee LLCAS2914NTT America, Inc.AS6667Elisa OyjAS32590Valve CorporationAS57866Fusix Networks B.…

Networks observed one and two hops upstream of AS23520 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

441

adjacent networks

Upstreams
215%
Peers
22852%
Downstreams
19244%

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

Upstreams of AS23520
NetworkCountryRelationshipPathsVantage pts
AS1299Arelion (fka. Telia Carrier)SEPeer258,778138
AS6830Liberty Global Europe Holding B.V.EUPeer179,805139
AS174Cogent Communications, LLCUSPeer126,353117
AS6762Telecom Italia Sparkle (Seabone)ITPeer74,42986
AS3257GTT Communications Inc.USPeer37,170119
AS3303Swisscom (Schweiz) AGCHPeer7,5811
AS7195EdgeUnoCOPeer4,1108
AS22356Durand do Brasil LtdaBRPeer9802
AS16735Algar TelecomBRPeer1612
AS27951Media Commerce Partners S.ACOPeer12267

Prefixes

All 127

The largest blocks AS23520 originates, widest first.

Largest prefixes originated by AS23520
PrefixAddressesVisibility
69.79.0.0/1665.5k2/76
72.252.0.0/1665.5k2/76
190.242.0.0/1665.5k75/76
63.245.0.0/1732.8k75/76
67.230.0.0/1732.8k75/76
69.79.128.0/1732.8k75/76
63.245.0.0/1816.4k75/76
67.230.64.0/1816.4k75/76
69.79.0.0/1816.4k75/76
190.131.192.0/1816.4k75/76

Routing health

How AS23520'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

  • Valid70.1%89
  • Invalid1.6%2
  • No ROA28.3%36

Propagation

  • Globally propagated90% of full-feed peers or more85.0%108
  • Partially propagated40% to 90%0.0%0
  • Seen by few peersUnder 40%15.0%19

Prefix sizes

IPv4 — 125 prefixes

IPv6 — 2 prefixes

  • /324.3B × /64100.0%2

Recent changes

Announcements that started or stopped since 11th Oct 2026.

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