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AS61337Single Mode Networks Ltd

United KingdomRegistryRIPE NCC

As of 11th November 2026, AS61337 (Single Mode Networks Ltd), a network registered in the United Kingdom with RIPE NCC, originates 12 IPv4 prefixes covering 4.9k addresses and 1 IPv6 prefix. By IPv4 address space that makes it the 16,138th-largest of the 80,747 networks we see originating IPv4, and the 490th-largest of 2,122 in the United Kingdom. It is seen behind 30 upstream networks, most often AS9002 (RETN Limited) and AS2914 (NTT America, Inc.), and in front of 9 downstream networks. 77% of its announcements have a valid RPKI ROA, and none are RPKI-invalid. 100% of its routes reach at least 90% of full-feed peers.

At a glance

IPv4 prefixes

12

IPv6 prefixes

1

IPv4 addresses

4.9k

IPv6 /64s

65.5k

Upstream graph

The networks AS61337 is seen behind, one and two hops out, drawn from real AS paths.

AS61337Toward the internet core
Upstream graph for AS61337: 12 neighbouring networks observed beyond it across 2 levels. The same networks are listed in the tables below.AS61337Single Mode Netwo…This networkAS2914NTT America, Inc.AS6939Hurricane Electri…AS9002RETN LimitedAS13030Init7 (Switzerlan…AS25091IP-Max SAAS49544i3D.net B.VAS215859Hetzner Cloud - S…AS20130Depaul UniversityAS3356Lumen (Level 3)AS6667Elisa OyjAS1299Arelion (fka. Tel…AS56662Marcin Gondek

Networks observed one and two hops upstream of AS61337 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

154

adjacent networks

Upstreams
3019%
Peers
11575%
Downstreams
96%

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

Upstreams of AS61337
NetworkCountryRelationshipPathsVantage pts
AS9002RETN LimitedGBPeer98155
AS2914NTT America, Inc.USPeer65243
AS13030Init7 (Switzerland) Ltd.CHPeer774
AS6939Hurricane Electric LLCUSPeer547
AS25091IP-Max SACHPeer363
AS18106Viewqwest Pte LtdSGPeer342
AS34555C.C.S. (Leeds) LtdGBPeer329
AS14537Continent 8 LLCUSPeer233
AS7195EdgeUnoCOPeer212
AS34549meerfarbig GmbH & Co. KGDEPeer213

Prefixes

The largest blocks AS61337 originates, widest first.

Largest prefixes originated by AS61337
PrefixAddressesVisibility
85.199.212.0/221k76/76
45.153.132.0/2351276/76
83.150.250.0/2351276/76
194.60.198.0/2351276/76
195.66.148.0/2351276/76
45.153.134.0/2425676/76
83.150.249.0/2425676/76
91.230.243.0/2425676/76
193.26.23.0/2425676/76
194.55.0.0/2425676/76

Routing health

How AS61337'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

  • Valid76.9%10
  • Invalid0.0%0
  • No ROA23.1%3

Propagation

  • Globally propagated90% of full-feed peers or more100.0%13
  • Partially propagated40% to 90%0.0%0
  • Seen by few peersUnder 40%0.0%0

Prefix sizes

IPv4 — 12 prefixes

IPv6 — 1 prefixes

  • /4865.5k × /64100.0%1

Recent changes

Announcements that started or stopped since 12th Oct 2026.

No announcement by AS61337 started or stopped in this period.

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