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AS33071ISC F-ROOT ORD1

United StatesRegistryARIN

As of 11th November 2026, AS33071 (ISC F-ROOT ORD1), a network registered in the United States with ARIN, 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 13,089th-largest of 18,752 in the United States. It is seen behind 8 upstream networks, most often AS6939 (Hurricane Electric LLC) and AS1299 (Arelion (fka. Telia Carrier)), and in front of 2 downstream networks. 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 AS33071 is seen behind, one and two hops out, drawn from real AS paths.

AS33071Toward the internet core
Upstream graph for AS33071: 12 neighbouring networks observed beyond it across 2 levels. The same networks are listed in the tables below.AS33071ISC F-ROOT ORD1This networkAS1299Arelion (fka. Tel…AS6453TATA Communicatio…AS6939Hurricane Electri…AS35280F5 Networks SARLAS49544i3D.net B.VAS13030Init7 (Switzerlan…AS16552Tiggee LLCAS8220COLTAS20130Depaul UniversityAS132337AxclusiveAS32590Valve CorporationAS2914NTT America, Inc.

Networks observed one and two hops upstream of AS33071 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

38

adjacent networks

Upstreams
821%
Peers
2874%
Downstreams
25%

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

Upstreams of AS33071
NetworkCountryRelationshipPathsVantage pts
AS6939Hurricane Electric LLCUSPeer405109
AS1299Arelion (fka. Telia Carrier)SEPeer3927
AS35280F5 Networks SARLFRPeer111
AS6453TATA Communications (America) IncUSPeer105
AS49544i3D.net B.VNLPeer82
AS4775Globe TelecomsPHAdjacent51
AS11164Internet2 I2PXUSPeer51
AS24482SG.GSSGPeer11

Prefixes

The largest blocks AS33071 originates, widest first.

Largest prefixes originated by AS33071
PrefixAddressesVisibility
199.6.0.0/2425676/76
2001:500:71::/4865.5k × /6463/63

Routing health

How AS33071'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 AS33071 started or stopped in this period.

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