subnet.im

AS30900Sternforth Ltd. trading as WebWorld

IrelandRegistryRIPE NCCTypeEyeball

As of 26th September 2026, AS30900 (Sternforth Ltd. trading as WebWorld), an access network registered in Ireland with RIPE NCC, originates 34 IPv4 prefixes covering 16.6k addresses and 2 IPv6 prefixes. By IPv4 address space that makes it the 7,873rd-largest of the 79,516 networks we see originating IPv4, and the 23rd-largest of 194 in Ireland. It is seen behind 8 upstream networks, most often AS56911 (Warian S.R.L.) and AS6830 (Liberty Global Europe Holding B.V.), and in front of 1 downstream network. 89% 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, and 3 prefixes are also originated by another network.

At a glance

IPv4 prefixes

34

IPv6 prefixes

2

IPv4 addresses

16.6k

IPv6 /64s

4.3B

Upstream graph

The networks AS30900 is seen behind, one and two hops out, drawn from real AS paths.

AS30900Toward the internet core
Upstream graph for AS30900: 12 neighbouring networks observed beyond it across 2 levels. The same networks are listed in the tables below.AS30900Sternforth Ltd. t…This networkAS3303Swisscom (Schweiz…AS6830Liberty Global Eu…AS6939Hurricane Electri…AS39122Blacknight Intern…AS56911Warian S.R.L.AS6667Elisa OyjAS57866Fusix Networks B.…AS18106Viewqwest Pte LtdAS20130Depaul UniversityAS174Cogent Communicat…AS1299Arelion (fka. Tel…AS3356Lumen (Level 3)

Networks observed one and two hops upstream of AS30900 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

27

adjacent networks

Upstreams
830%
Peers
1867%
Downstreams
14%

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

Upstreams of AS30900
NetworkCountryRelationshipPathsVantage pts
AS56911Warian S.R.L.ITPeer1,561119
AS6830Liberty Global Europe Holding B.V.EUPeer1,14581
AS6939Hurricane Electric LLCUSPeer28121
AS39122Blacknight Internet Solutions LimitedIEPeer352
AS13237euNetworks GmbHDEPeer321
AS3303Swisscom (Schweiz) AGCHPeer321
AS9002RETN LimitedGBPeer246
AS14537Continent 8 LLCUSPeer102

Prefixes

All 36

The largest blocks AS30900 originates, widest first.

Largest prefixes originated by AS30900
PrefixAddressesVisibility
217.115.112.0/204.1k81/81
83.138.8.0/212k81/81
185.108.128.0/221k81/81
185.152.4.0/221k81/81
185.176.128.0/221k81/81
77.47.213.0/2425681/81
82.21.218.0/2425681/81
82.21.248.0/2425681/81
82.22.214.0/2425681/81
82.22.223.0/2425681/81

Routing health

How AS30900'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

  • Valid88.9%32
  • Invalid0.0%0
  • No ROA11.1%4

Propagation

  • Globally propagated90% of full-feed peers or more100.0%36
  • Partially propagated40% to 90%0.0%0
  • Seen by few peersUnder 40%0.0%0

Prefix sizes

IPv4 — 34 prefixes

IPv6 — 2 prefixes

  • /324.3B × /6450.0%1
  • /4865.5k × /6450.0%1

Recent changes

Announcements that started or stopped since 28th Aug 2026.

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