subnet.im

AS23520Columbus Networks USA, Inc.

United StatesRegistryARINTypeCarrier

As of 26th September 2026, AS23520 (Columbus Networks USA, Inc.), a transit carrier registered in the United States with ARIN, originates 118 IPv4 prefixes covering 433k addresses and 2 IPv6 prefixes. By IPv4 address space that makes it the 780th-largest of the 79,480 networks we see originating IPv4, and the 195th-largest of 18,421 in the United States. It is seen behind 20 upstream networks, most often AS1299 (Arelion (fka. Telia Carrier)) and AS6830 (Liberty Global Europe Holding B.V.), and in front of 179 downstream networks. 71% of its announcements have a valid RPKI ROA; 3 are RPKI-invalid. 89% of its routes reach at least 90% of full-feed peers.

At a glance

IPv4 prefixes

118

IPv6 prefixes

2

IPv4 addresses

433k

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…AS8888xTom Pty LtdAS13030Init7 (Switzerlan…AS2914NTT America, Inc.AS6667Elisa OyjAS52075Wifirst S.A.S.AS57866Fusix 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

413

adjacent networks

Upstreams
205%
Peers
21452%
Downstreams
17943%

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

Upstreams of AS23520
NetworkCountryRelationshipPathsVantage pts
AS1299Arelion (fka. Telia Carrier)SEPeer258,738143
AS6830Liberty Global Europe Holding B.V.EUPeer172,882145
AS174Cogent Communications, LLCUSPeer154,626114
AS6762Telecom Italia Sparkle (Seabone)ITPeer72,54585
AS3257GTT Communications Inc.USPeer45,905111
AS3303Swisscom (Schweiz) AGCHPeer7,4271
AS7195EdgeUnoCOPeer1,3195
AS22356Durand do Brasil LtdaBRPeer3122
AS27951Media Commerce Partners S.ACOPeer16375
AS16735Algar TelecomBRPeer1082

Prefixes

All 120

The largest blocks AS23520 originates, widest first.

Largest prefixes originated by AS23520
PrefixAddressesVisibility
69.79.0.0/1665.5k2/81
72.252.0.0/1665.5k2/81
190.242.0.0/1665.5k80/81
63.245.0.0/1732.8k80/81
67.230.0.0/1732.8k80/81
69.79.128.0/1732.8k80/81
63.245.0.0/1816.4k80/81
67.230.64.0/1816.4k80/81
69.79.0.0/1816.4k80/81
190.131.192.0/1816.4k80/81

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

  • Valid70.8%85
  • Invalid2.5%3
  • No ROA26.7%32

Propagation

  • Globally propagated90% of full-feed peers or more89.2%107
  • Partially propagated40% to 90%0.0%0
  • Seen by few peersUnder 40%10.8%13

Prefix sizes

IPv4 — 118 prefixes

IPv6 — 2 prefixes

  • /324.3B × /64100.0%2

Recent changes

Announcements that started or stopped since 27th Aug 2026.

  • Announced190.242.194.0/2424th Sept 2026
  • Withdrawn186.5.128.0/2221st Sept 2026
  • Withdrawn190.242.194.0/2421st Sept 2026
  • Withdrawn190.242.20.0/2421st Sept 2026
  • Withdrawn190.242.6.0/2321st Sept 2026
  • Withdrawn190.242.64.0/2121st Sept 2026
  • Withdrawn190.242.8.0/2121st Sept 2026
  • Withdrawn200.115.160.0/2221st Sept 2026
  • Withdrawn200.115.164.0/2221st Sept 2026

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