subnet.im

AS1101SURF (Thunderlab)

NetherlandsRegistryRIPE NCC

As of 22nd October 2026, AS1101 (SURF (Thunderlab)), a network registered in the Netherlands with RIPE NCC, originates 16 IPv4 prefixes covering 1.8M addresses and 5 IPv6 prefixes. By IPv4 address space that makes it the 301st-largest of the 79,655 networks we see originating IPv4, and the 6th-largest of 1,021 in the Netherlands. It is seen behind 33 upstream networks, most often AS64404 (Stichting EventInfra) and AS1103 (SURF B.V.), and in front of 5 downstream networks. 71% of its announcements have a valid RPKI ROA; 2 are RPKI-invalid. 81% of its routes reach at least 90% of full-feed peers.

At a glance

IPv4 prefixes

16

IPv6 prefixes

5

IPv4 addresses

1.8M

IPv6 /64s

8.6B

Upstream graph

The networks AS1101 is seen behind, one and two hops out, drawn from real AS paths.

AS1101Toward the internet core
Upstream graph for AS1101: 12 neighbouring networks observed beyond it across 2 levels. The same networks are listed in the tables below.AS1101SURF (Thunderlab)This networkAS1103SURF B.V.AS6939Hurricane Electri…AS7713PT Telkom Indones…AS18106Viewqwest Pte LtdAS64404Stichting EventIn…AS6830Liberty Global Eu…AS20562Open Peering (Bro…AS20130Depaul UniversityAS6453TATA Communicatio…AS35280F5 Networks SARLAS2914NTT America, Inc.AS49544i3D.net B.V

Networks observed one and two hops upstream of AS1101 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

194

adjacent networks

Upstreams
3317%
Peers
15680%
Downstreams
53%

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

Upstreams of AS1101
NetworkCountryRelationshipPathsVantage pts
AS64404Stichting EventInfraNLPeer1,098122
AS1103SURF B.V.NLPeer35663
AS7713PT Telkom Indonesia TbkIDPeer594
AS6939Hurricane Electric LLCUSPeer478
AS18106Viewqwest Pte LtdSGPeer242
AS58511Swoop (Anycast Global Backbone)AUPeer212
AS25091IP-Max SACHPeer202
AS39122Blacknight Internet Solutions LimitedIEPeer202
AS24940Hetzner Online GmbHDEPeer202
AS32590Valve CorporationUSPeer202

Prefixes

The largest blocks AS1101 originates, widest first.

Largest prefixes originated by AS1101
PrefixAddressesVisibility
145.192.0.0/121M76/77
145.208.0.0/13524k76/77
44.137.0.0/1665.5k77/77
145.99.0.0/1665.5k77/77
145.220.0.0/1665.5k77/77
192.42.128.0/221k77/77
145.102.4.0/2351277/77
192.42.118.0/2351277/77
185.17.73.0/2425677/77
185.100.59.0/2425677/77

Routing health

How AS1101'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

  • Valid71.4%15
  • Invalid9.5%2
  • No ROA19.0%4

Propagation

  • Globally propagated90% of full-feed peers or more81.0%17
  • Partially propagated40% to 90%0.0%0
  • Seen by few peersUnder 40%19.0%4

Prefix sizes

IPv4 — 16 prefixes

IPv6 — 5 prefixes

  • /324.3B × /6440.0%2
  • /45524k × /6420.0%1
  • /4865.5k × /6440.0%2

Recent changes

Announcements that started or stopped since 22nd Sept 2026.

  • Withdrawn145.111.0.0/1624th Sept 2026
  • Announced145.111.0.0/1623rd Sept 2026

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