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AS18366APNIC ANYCAST ASN

AustraliaRegistryAPNIC

As of 11th November 2026, AS18366 (APNIC ANYCAST ASN), a network registered in Australia with APNIC, originates 1 IPv4 prefix covering 256 addresses and 1 IPv6 prefix. By IPv4 address space that makes it the 59,982nd-largest of the 80,747 networks we see originating IPv4, and the 1,149th-largest of 1,697 in Australia. It is seen behind 3 upstream networks, most often AS20473 (The Constant Company, LLC) and AS4777 (Asia Pacific Network Information Centre). 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

1

IPv6 prefixes

1

IPv4 addresses

256

IPv6 /64s

65.5k

Upstream graph

The networks AS18366 is seen behind, one and two hops out, drawn from real AS paths.

AS18366Toward the internet core
Upstream graph for AS18366: 9 neighbouring networks observed beyond it across 2 levels. The same networks are listed in the tables below.AS18366APNIC ANYCAST ASNThis networkAS4608Asia Pacific Netw…AS4777Asia Pacific Netw…AS20473The Constant Comp…AS4826Vocus Connect Int…AS7575Australian Academ…AS2497Internet Initiati…AS3491PCCW Global (HK) …AS1299Arelion (fka. Tel…AS2914NTT America, Inc.

Networks observed one and two hops upstream of AS18366 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
350%
Peers
350%
Downstreams
00%

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

Upstreams of AS18366
NetworkCountryRelationshipPathsVantage pts
AS20473The Constant Company, LLCUSPeer8181
AS4777Asia Pacific Network Information CentreAUPeer5353
AS4608Asia Pacific Network Information CentreAUPeer44

Prefixes

The largest blocks AS18366 originates, widest first.

Largest prefixes originated by AS18366
PrefixAddressesVisibility
202.12.31.0/2425676/76
2001:dd8:12::/4865.5k × /6462/63

Routing health

How AS18366'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%2
  • Invalid0.0%0
  • No ROA0.0%0

Propagation

  • Globally propagated90% of full-feed peers or more100.0%2
  • Partially propagated40% to 90%0.0%0
  • Seen by few peersUnder 40%0.0%0

Prefix sizes

IPv4 — 1 prefixes

IPv6 — 1 prefixes

  • /4865.5k × /64100.0%1

Recent changes

Announcements that started or stopped since 12th Oct 2026.

No announcement by AS18366 started or stopped in this period.

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