subnet.im

AS204921zhenyun sun

United KingdomRegistryRIPE NCC

As of 11th November 2026, AS204921 (zhenyun sun), a network registered in the United Kingdom with RIPE NCC, originates 6 IPv4 prefixes covering 2.8k addresses and 18 IPv6 prefixes. By IPv4 address space that makes it the 22,792nd-largest of the 80,743 networks we see originating IPv4, and the 676th-largest of 2,122 in the United Kingdom. It is seen behind 26 upstream networks, most often AS18423 (RAID Networks Co., Ltd.) and AS6939 (Hurricane Electric LLC), and in front of 1 downstream network. 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

18

IPv4 addresses

2.8k

IPv6 /64s

2.2M

Upstream graph

The networks AS204921 is seen behind, one and two hops out, drawn from real AS paths.

AS204921Toward the internet core
Upstream graph for AS204921: 12 neighbouring networks observed beyond it across 2 levels. The same networks are listed in the tables below.AS204921zhenyun sunThis networkAS6939Hurricane Electri…AS18423RAID Networks Co.…AS20473The Constant Comp…AS36530IDC CubeAS44324MoeDove LLCAS20130Depaul UniversityAS132337AxclusiveAS9002RETN LimitedAS137409GSL Networks Pty …AS17433Hytron Network Se…AS140227Hong Kong Communi…AS216211CYBERVERSE LLC

Networks observed one and two hops upstream of AS204921 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

79

adjacent networks

Upstreams
2633%
Peers
5266%
Downstreams
11%

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

Upstreams of AS204921
NetworkCountryRelationshipPathsVantage pts
AS18423RAID Networks Co., Ltd.TWPeer387112
AS6939Hurricane Electric LLCUSPeer20950
AS36530IDC CubeUSPeer137121
AS44324MoeDove LLCUSPeer130109
AS20473The Constant Company, LLCUSPeer12866
AS11967Hop179 OUEEPeer12676
AS199310XIN BING XIANCNPeer11363
AS216211CYBERVERSE LLCUSPeer7355
AS204211Shanghai Yingyun Network Technology Co., Ltd.CNPeer6363
AS204539Axivora Connect LtdGBPeer6060

Prefixes

The largest blocks AS204921 originates, widest first.

Largest prefixes originated by AS204921
PrefixAddressesVisibility
177.177.80.0/221k76/76
177.177.80.0/2351276/76
177.177.82.0/2351276/76
177.177.80.0/2425676/76
177.177.81.0/2425676/76
177.177.83.0/2425676/76
2a0e:aa07:e250::/441M × /6462/63
2602:f3ff:83::/4865.5k × /6462/63
2a0e:aa07:e251::/4865.5k × /6462/63
2a0e:aa07:e252::/4865.5k × /6462/63

Routing health

How AS204921'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%24
  • Invalid0.0%0
  • No ROA0.0%0

Propagation

  • Globally propagated90% of full-feed peers or more100.0%24
  • Partially propagated40% to 90%0.0%0
  • Seen by few peersUnder 40%0.0%0

Prefix sizes

IPv4 — 6 prefixes

IPv6 — 18 prefixes

  • /441M × /645.6%1
  • /4865.5k × /6494.4%17

Recent changes

Announcements that started or stopped since 12th Oct 2026.

15 announced and 16 withdrawn in all; the most recent are shown.

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