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AS27321ISC F-ROOT OAK1

United StatesRegistryARIN

As of 27th September 2026, AS27321 (ISC F-ROOT OAK1), a network registered in the United States with ARIN, originates 8 IPv4 prefixes covering 2k addresses and 1 IPv6 prefix. By IPv4 address space that makes it the 25,307th-largest of the 79,523 networks we see originating IPv4, and the 6,295th-largest of 18,427 in the United States. It is seen behind 3 upstream networks, most often AS6939 (Hurricane Electric LLC) and AS6461 (Zayo Bandwidth). 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

8

IPv6 prefixes

1

IPv4 addresses

2k

IPv6 /64s

65.5k

Upstream graph

The networks AS27321 is seen behind, one and two hops out, drawn from real AS paths.

AS27321Toward the internet core
Upstream graph for AS27321: 8 neighbouring networks observed beyond it across 2 levels. The same networks are listed in the tables below.AS27321ISC F-ROOT OAK1This networkAS6461Zayo BandwidthAS6939Hurricane Electri…AS49544i3D.net B.VAS32590Valve CorporationAS2914NTT America, Inc.AS18106Viewqwest Pte LtdAS20130Depaul UniversityAS3356Lumen (Level 3)

Networks observed one and two hops upstream of AS27321 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

19

adjacent networks

Upstreams
316%
Peers
1684%
Downstreams
00%

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

Upstreams of AS27321
NetworkCountryRelationshipPathsVantage pts
AS6939Hurricane Electric LLCUSPeer45497
AS6461Zayo BandwidthUSPeer24845
AS49544i3D.net B.VNLPeer11

Prefixes

The largest blocks AS27321 originates, widest first.

Largest prefixes originated by AS27321
PrefixAddressesVisibility
149.20.0.0/2425680/81
149.20.2.0/2425680/81
149.20.3.0/2425680/81
149.20.4.0/2425680/81
149.20.57.0/2425680/81
149.20.66.0/2425680/81
192.158.248.0/2425680/81
192.158.249.0/2425680/81
2001:500:6b::/4865.5k × /6463/64

Routing health

How AS27321'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%9
  • Invalid0.0%0
  • No ROA0.0%0

Propagation

  • Globally propagated90% of full-feed peers or more100.0%9
  • Partially propagated40% to 90%0.0%0
  • Seen by few peersUnder 40%0.0%0

Prefix sizes

IPv4 — 8 prefixes

IPv6 — 1 prefixes

  • /4865.5k × /64100.0%1

Recent changes

Announcements that started or stopped since 28th Aug 2026.

No announcement by AS27321 started or stopped in this period.

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