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AS8916Portfast Ltd

United KingdomRegistryRIPE NCCTypeContent

As of 11th November 2026, AS8916 (Portfast Ltd), a content network registered in the United Kingdom with RIPE NCC, originates 6 IPv4 prefixes covering 8.7k addresses and 2 IPv6 prefixes. By IPv4 address space that makes it the 11,634th-largest of the 80,743 networks we see originating IPv4, and the 358th-largest of 2,122 in the United Kingdom. It is seen behind 2 upstream networks, most often AS3356 (Lumen (Level 3)) and AS41230 (ASK4 Limited), and in front of 1 downstream network. 88% 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

6

IPv6 prefixes

2

IPv4 addresses

8.7k

IPv6 /64s

34.4B

Upstream graph

The networks AS8916 is seen behind, one and two hops out, drawn from real AS paths.

AS8916Toward the internet core
Upstream graph for AS8916: 5 neighbouring networks observed beyond it across 2 levels. The same networks are listed in the tables below.AS8916Portfast LtdThis networkAS3356Lumen (Level 3)AS41230ASK4 LimitedAS3549Lumen (fka. Globa…AS2914NTT America, Inc.AS1299Arelion (fka. Tel…

Networks observed one and two hops upstream of AS8916 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

6

adjacent networks

Upstreams
233%
Peers
350%
Downstreams
117%

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

Upstreams of AS8916
NetworkCountryRelationshipPathsVantage pts
AS3356Lumen (Level 3)USPeer706117
AS41230ASK4 LimitedGBPeer45458

Prefixes

The largest blocks AS8916 originates, widest first.

Largest prefixes originated by AS8916
PrefixAddressesVisibility
188.246.192.0/204.1k76/76
213.5.88.0/212k76/76
188.246.216.0/221k76/76
188.246.220.0/221k76/76
130.193.30.0/2425676/76
193.108.199.0/2425676/76
2a03:9800::/2934.4B × /6462/63
2001:67c:1b8::/4865.5k × /6462/63

Routing health

How AS8916'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

  • Valid87.5%7
  • Invalid0.0%0
  • No ROA12.5%1

Propagation

  • Globally propagated90% of full-feed peers or more100.0%8
  • Partially propagated40% to 90%0.0%0
  • Seen by few peersUnder 40%0.0%0

Prefix sizes

IPv4 — 6 prefixes

IPv6 — 2 prefixes

  • /2934.4B × /6450.0%1
  • /4865.5k × /6450.0%1

Recent changes

Announcements that started or stopped since 12th Oct 2026.

No announcement by AS8916 started or stopped in this period.

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