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AS3671SLAC National Accelerator Laboratory

United StatesRegistryARIN

As of 10th November 2026, AS3671 (SLAC National Accelerator Laboratory), a network registered in the United States with ARIN, originates 2 IPv4 prefixes covering 65.8k addresses and 1 IPv6 prefix. By IPv4 address space that makes it the 3,583rd-largest of the 80,733 networks we see originating IPv4, and the 1,246th-largest of 18,751 in the United States. It is seen behind 2 upstream networks, most often AS293 (ESnet) and AS46749 (Stanford University), 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, and 1 prefix is also originated by another network.

At a glance

IPv4 prefixes

2

IPv6 prefixes

1

IPv4 addresses

65.8k

IPv6 /64s

1M

Upstream graph

The networks AS3671 is seen behind, one and two hops out, drawn from real AS paths.

AS3671Toward the internet core
Upstream graph for AS3671: 5 neighbouring networks observed beyond it across 2 levels. The same networks are listed in the tables below.AS3671SLAC National Acc…This networkAS293ESnetAS46749Stanford Universi…AS2914NTT America, Inc.AS6939Hurricane Electri…AS2152CENIC - CalREN

Networks observed one and two hops upstream of AS3671 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
233%
Peers
350%
Downstreams
117%

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

Upstreams of AS3671
NetworkCountryRelationshipPathsVantage pts
AS293ESnetUSPeer213138
AS46749Stanford UniversityUSPeer21

Prefixes

The largest blocks AS3671 originates, widest first.

Largest prefixes originated by AS3671
PrefixAddressesVisibility
134.79.0.0/1665.5k76/76
198.51.111.0/2425675/76
2620:114:d000::/441M × /6463/63

Routing health

How AS3671'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%3
  • Invalid0.0%0
  • No ROA0.0%0

Propagation

  • Globally propagated90% of full-feed peers or more100.0%3
  • Partially propagated40% to 90%0.0%0
  • Seen by few peersUnder 40%0.0%0

Prefix sizes

IPv4 — 2 prefixes

IPv6 — 1 prefixes

  • /441M × /64100.0%1

Recent changes

Announcements that started or stopped since 12th Oct 2026.

No announcement by AS3671 started or stopped in this period.

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