subnet.im

AS216405Metric Systems UK LTD

United KingdomRegistryRIPE NCC

As of 11th November 2026, AS216405 (Metric Systems UK LTD), a network registered in the United Kingdom with RIPE NCC, originates 6 IPv4 prefixes covering 1.5k addresses and 2 IPv6 prefixes. By IPv4 address space that makes it the 31,739th-largest of the 80,747 networks we see originating IPv4, and the 901st-largest of 2,122 in the United Kingdom. It is seen behind 1 upstream network, most often AS51809 (BRSK Limited). Every one of its announcements has 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

1.5k

IPv6 /64s

131k

Upstream graph

The networks AS216405 is seen behind, one and two hops out, drawn from real AS paths.

AS216405Toward the internet core
Upstream graph for AS216405: 2 neighbouring networks observed beyond it across 2 levels. The same networks are listed in the tables below.AS216405Metric Systems UK…This networkAS51809BRSK LimitedAS212655YouFibre Limited

Networks observed one and two hops upstream of AS216405 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

2

adjacent networks

Upstreams
150%
Peers
150%
Downstreams
00%

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

Upstreams of AS216405
NetworkCountryRelationshipPathsVantage pts
AS51809BRSK LimitedGBPeer579138

Prefixes

The largest blocks AS216405 originates, widest first.

Largest prefixes originated by AS216405
PrefixAddressesVisibility
51.241.49.0/2425676/76
82.152.102.0/2425676/76
163.5.89.0/2425676/76
185.46.114.0/2425676/76
194.77.95.0/2425676/76
212.74.33.0/2425676/76
2a03:5840:12d::/4865.5k × /6462/63
2a13:9500:18d::/4865.5k × /6461/63

Routing health

How AS216405'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%8
  • Invalid0.0%0
  • No ROA0.0%0

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

  • /4865.5k × /64100.0%2

Recent changes

Announcements that started or stopped since 12th Oct 2026.

  • Withdrawn62.84.166.0/243rd Nov 2026
  • Announced51.241.49.0/2429th Oct 2026
  • Announced62.84.166.0/2429th Oct 2026
  • Withdrawn62.84.166.0/2427th Oct 2026

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