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AS21743Atlas Networks Corporation

United StatesRegistryARIN

As of 24th October 2026, AS21743 (Atlas Networks Corporation), a network registered in the United States with ARIN, originates 24 IPv4 prefixes covering 23k addresses and 2 IPv6 prefixes. By IPv4 address space that makes it the 6,527th-largest of the 79,642 networks we see originating IPv4, and the 2,184th-largest of 18,487 in the United States. It is seen behind 10 upstream networks, most often AS2914 (NTT America, Inc.) and AS3257 (GTT Communications Inc.), and in front of 1 downstream network. 50% 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

24

IPv6 prefixes

2

IPv4 addresses

23k

IPv6 /64s

4.3B

Upstream graph

The networks AS21743 is seen behind, one and two hops out, drawn from real AS paths.

AS21743Toward the internet core
Upstream graph for AS21743: 12 neighbouring networks observed beyond it across 2 levels. The same networks are listed in the tables below.AS21743Atlas Networks Co…This networkAS2914NTT America, Inc.AS3257GTT Communication…AS6939Hurricane Electri…AS9002RETN LimitedAS18106Viewqwest Pte LtdAS49544i3D.net B.VAS6667Elisa OyjAS398465Rackdog LLCAS20130Depaul UniversityAS132337AxclusiveAS215859Hetzner Cloud - S…AS3356Lumen (Level 3)

Networks observed one and two hops upstream of AS21743 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
1026%
Peers
2771%
Downstreams
13%

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

Upstreams of AS21743
NetworkCountryRelationshipPathsVantage pts
AS2914NTT America, Inc.USPeer1,070122
AS3257GTT Communications Inc.USPeer88776
AS6939Hurricane Electric LLCUSPeer2613
AS9002RETN LimitedGBPeer84
AS49544i3D.net B.VNLPeer42
AS24482SG.GSSGPeer42
AS58511Swoop (Anycast Global Backbone)AUPeer42
AS18106Viewqwest Pte LtdSGPeer42
AS35280F5 Networks SARLFRPeer21
AS3130RGnet OUEEPeer21

Prefixes

All 26

The largest blocks AS21743 originates, widest first.

Largest prefixes originated by AS21743
PrefixAddressesVisibility
66.171.176.0/204.1k76/76
66.170.184.0/212k76/76
149.57.248.0/212k76/76
199.231.240.0/212k76/76
69.5.52.0/221k76/76
91.234.156.0/221k76/76
104.36.44.0/221k76/76
104.192.204.0/221k76/76
104.247.120.0/221k76/76
104.255.0.0/221k76/76

Routing health

How AS21743'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

  • Valid50.0%13
  • Invalid0.0%0
  • No ROA50.0%13

Propagation

  • Globally propagated90% of full-feed peers or more100.0%26
  • Partially propagated40% to 90%0.0%0
  • Seen by few peersUnder 40%0.0%0

Prefix sizes

IPv4 — 24 prefixes

IPv6 — 2 prefixes

  • /324.3B × /6450.0%1
  • /4865.5k × /6450.0%1

Recent changes

Announcements that started or stopped since 24th Sept 2026.

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