subnet.im

AS19366Fibertown Data Centers

United StatesRegistryARINTypeCarrier

As of 11th November 2026, AS19366 (Fibertown Data Centers), a transit carrier registered in the United States with ARIN, originates 10 IPv4 prefixes covering 17.4k addresses. By IPv4 address space that makes it the 7,772nd-largest of the 80,743 networks we see originating IPv4, and the 2,498th-largest of 18,754 in the United States. It is seen behind 6 upstream networks, most often AS6461 (Zayo Bandwidth) and AS3356 (Lumen (Level 3)), and in front of 11 downstream networks. 80% 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

0

IPv4 addresses

17.4k

IPv6 /64s

0

Upstream graph

The networks AS19366 is seen behind, one and two hops out, drawn from real AS paths.

AS19366Toward the internet core
Upstream graph for AS19366: 10 neighbouring networks observed beyond it across 2 levels. The same networks are listed in the tables below.AS19366Fibertown Data Ce…This networkAS174Cogent Communicat…AS3356Lumen (Level 3)AS6300FidiumAS6461Zayo BandwidthAS394437PS LightwaveAS151326DCConnect Communi…AS3549Lumen (fka. Globa…AS1299Arelion (fka. Tel…AS2914NTT America, Inc.AS32590Valve Corporation

Networks observed one and two hops upstream of AS19366 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

34

adjacent networks

Upstreams
618%
Peers
1750%
Downstreams
1132%

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

Upstreams of AS19366
NetworkCountryRelationshipPathsVantage pts
AS6461Zayo BandwidthUSPeer82136
AS3356Lumen (Level 3)USPeer39536
AS174Cogent Communications, LLCUSPeer35833
AS394437PS LightwaveUSPeer28376
AS6300FidiumUSPeer5026
AS35847Ezee FiberUSPeer212

Prefixes

The largest blocks AS19366 originates, widest first.

Largest prefixes originated by AS19366
PrefixAddressesVisibility
97.107.0.0/204.1k75/76
209.189.240.0/204.1k75/76
199.101.240.0/212k75/76
209.189.224.0/212k75/76
216.81.32.0/212k75/76
216.81.40.0/212k75/76
66.102.17.0/2425675/76
192.149.125.0/2425675/76
192.190.100.0/2425675/76
198.46.67.0/2425675/76

Routing health

How AS19366'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

  • Valid80.0%8
  • Invalid0.0%0
  • No ROA20.0%2

Propagation

  • Globally propagated90% of full-feed peers or more100.0%10
  • Partially propagated40% to 90%0.0%0
  • Seen by few peersUnder 40%0.0%0

Prefix sizes

IPv4 — 10 prefixes

Recent changes

Announcements that started or stopped since 12th Oct 2026.

No announcement by AS19366 started or stopped in this period.

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