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AS41230ASK4 Limited

United KingdomRegistryRIPE NCCTypeEyeball

As of 11th November 2026, AS41230 (ASK4 Limited), an access network registered in the United Kingdom with RIPE NCC, originates 16 IPv4 prefixes covering 122k addresses and 7 IPv6 prefixes. By IPv4 address space that makes it the 2,158th-largest of the 80,743 networks we see originating IPv4, and the 43rd-largest of 2,122 in the United Kingdom. It is seen behind 36 upstream networks, most often AS1299 (Arelion (fka. Telia Carrier)) and AS2914 (NTT America, Inc.), and in front of 4 downstream networks. Every one of its announcements has a valid RPKI ROA, and none are RPKI-invalid. 91% of its routes reach at least 90% of full-feed peers.

At a glance

IPv4 prefixes

16

IPv6 prefixes

7

IPv4 addresses

122k

IPv6 /64s

241B

Upstream graph

The networks AS41230 is seen behind, one and two hops out, drawn from real AS paths.

AS41230Toward the internet core
Upstream graph for AS41230: 12 neighbouring networks observed beyond it across 2 levels. The same networks are listed in the tables below.AS41230ASK4 LimitedThis networkAS1299Arelion (fka. Tel…AS2914NTT America, Inc.AS6939Hurricane Electri…AS18106Viewqwest Pte LtdAS24482SG.GSAS13030Init7 (Switzerlan…AS16552Tiggee LLCAS49544i3D.net B.VAS20130Depaul UniversityAS132337AxclusiveAS215859Hetzner Cloud - S…AS38623Metfone (Viettel …

Networks observed one and two hops upstream of AS41230 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

172

adjacent networks

Upstreams
3621%
Peers
13277%
Downstreams
42%

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

Upstreams of AS41230
NetworkCountryRelationshipPathsVantage pts
AS1299Arelion (fka. Telia Carrier)SEPeer86767
AS2914NTT America, Inc.USPeer80093
AS6939Hurricane Electric LLCUSPeer13517
AS18106Viewqwest Pte LtdSGPeer742
AS24482SG.GSSGPeer664
AS25091IP-Max SACHPeer652
AS13030Init7 (Switzerland) Ltd.CHPeer602
AS14537Continent 8 LLCUSPeer562
AS32590Valve CorporationUSPeer542
AS52075Wifirst S.A.S.FRPeer542

Prefixes

The largest blocks AS41230 originates, widest first.

Largest prefixes originated by AS41230
PrefixAddressesVisibility
31.205.0.0/1665.5k76/76
31.205.64.0/1816.4k23/76
31.205.192.0/1816.4k23/76
213.143.0.0/198.2k76/76
78.109.176.0/204.1k76/76
81.23.48.0/204.1k76/76
45.81.120.0/221k76/76
45.154.248.0/221k76/76
185.134.128.0/221k76/76
185.134.136.0/221k76/76

Routing health

How AS41230'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

  • Valid100.0%23
  • Invalid0.0%0
  • No ROA0.0%0

Propagation

  • Globally propagated90% of full-feed peers or more91.3%21
  • Partially propagated40% to 90%0.0%0
  • Seen by few peersUnder 40%8.7%2

Prefix sizes

IPv4 — 16 prefixes

IPv6 — 7 prefixes

  • /2934.4B × /64100.0%7

Recent changes

Announcements that started or stopped since 12th Oct 2026.

No announcement by AS41230 started or stopped in this period.

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