subnet.im

AS394621Stack41, llc.

United StatesRegistryARIN

As of 22nd October 2026, AS394621 (Stack41, llc.), a network registered in the United States with ARIN, originates 10 IPv4 prefixes covering 3.3k addresses and 1 IPv6 prefix. By IPv4 address space that makes it the 19,549th-largest of the 79,663 networks we see originating IPv4, and the 5,363rd-largest of 18,476 in the United States. It is seen behind 4 upstream networks, most often AS3356 (Lumen (Level 3)) and AS40264 (Charter Communications LLC), and in front of 2 downstream networks. 18% of its announcements have 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

10

IPv6 prefixes

1

IPv4 addresses

3.3k

IPv6 /64s

4.3B

Upstream graph

The networks AS394621 is seen behind, one and two hops out, drawn from real AS paths.

AS394621Toward the internet core
Upstream graph for AS394621: 11 neighbouring networks observed beyond it across 2 levels. The same networks are listed in the tables below.AS394621Stack41, llc.This networkAS3356Lumen (Level 3)AS11796Airstream Communi…AS13367Comcast Cable Com…AS40264Charter Communica…AS2914NTT America, Inc.AS3549Lumen (fka. Globa…AS1299Arelion (fka. Tel…AS3257GTT Communication…AS7922Comcast Cable Com…AS10796Charter Communica…AS20115Spectrum (Charter)

Networks observed one and two hops upstream of AS394621 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

12

adjacent networks

Upstreams
433%
Peers
650%
Downstreams
217%

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

Upstreams of AS394621
NetworkCountryRelationshipPathsVantage pts
AS3356Lumen (Level 3)USPeer513100
AS40264Charter Communications LLCUSPeer31477
AS11796Airstream Communications, LLCUSPeer16040
AS13367Comcast Cable Communications, LLCUSPeer7676

Prefixes

The largest blocks AS394621 originates, widest first.

Largest prefixes originated by AS394621
PrefixAddressesVisibility
161.38.16.0/221k77/77
50.227.99.0/2425676/77
148.59.37.0/2425677/77
148.59.133.0/2425677/77
161.38.16.0/2425677/77
161.38.17.0/2425677/77
161.38.18.0/2425677/77
161.38.19.0/2425677/77
162.223.125.0/2425677/77
207.166.139.0/2425677/77

Routing health

How AS394621'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

  • Valid18.2%2
  • Invalid0.0%0
  • No ROA81.8%9

Propagation

  • Globally propagated90% of full-feed peers or more100.0%11
  • Partially propagated40% to 90%0.0%0
  • Seen by few peersUnder 40%0.0%0

Prefix sizes

IPv4 — 10 prefixes

IPv6 — 1 prefixes

  • /324.3B × /64100.0%1

Recent changes

Announcements that started or stopped since 23rd Sept 2026.

No announcement by AS394621 started or stopped in this period.

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