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AS19523FlexNetworks

CanadaRegistryARIN

As of 11th November 2026, AS19523 (FlexNetworks), a network registered in Canada with ARIN, originates 35 IPv4 prefixes covering 20.7k addresses and 7 IPv6 prefixes. By IPv4 address space that makes it the 7,011th-largest of the 80,747 networks we see originating IPv4, and the 209th-largest of 1,608 in Canada. It is seen behind 10 upstream networks, most often AS6939 (Hurricane Electric LLC) and AS174 (Cogent Communications, LLC), and in front of 20 downstream networks. 62% 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

35

IPv6 prefixes

7

IPv4 addresses

20.7k

IPv6 /64s

8.9B

Upstream graph

The networks AS19523 is seen behind, one and two hops out, drawn from real AS paths.

AS19523Toward the internet core
Upstream graph for AS19523: 12 neighbouring networks observed beyond it across 2 levels. The same networks are listed in the tables below.AS19523FlexNetworksThis networkAS174Cogent Communicat…AS3130RGnet OUAS6939Hurricane Electri…AS24482SG.GSAS58511Swoop (Anycast Gl…AS151326DCConnect Communi…AS2497Internet Initiati…AS2914NTT America, Inc.AS1299Arelion (fka. Tel…AS20130Depaul UniversityAS132337AxclusiveAS3491PCCW Global (HK) …

Networks observed one and two hops upstream of AS19523 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

74

adjacent networks

Upstreams
1014%
Peers
4459%
Downstreams
2027%

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

Upstreams of AS19523
NetworkCountryRelationshipPathsVantage pts
AS6939Hurricane Electric LLCUSPeer4,135111
AS174Cogent Communications, LLCUSPeer1,14922
AS58511Swoop (Anycast Global Backbone)AUPeer1212
AS3130RGnet OUEEPeer1101
AS24482SG.GSSGPeer862
AS49544i3D.net B.VNLPeer802
AS9002RETN LimitedGBPeer712
AS22652Videotron LteeCAPeer641
AS35280F5 Networks SARLFRPeer621
AS20473The Constant Company, LLCUSPeer111

Prefixes

All 42

The largest blocks AS19523 originates, widest first.

Largest prefixes originated by AS19523
PrefixAddressesVisibility
64.203.64.0/204.1k76/76
64.203.64.0/212k76/76
64.203.72.0/212k76/76
64.203.80.0/212k76/76
64.203.88.0/212k76/76
64.72.196.0/2351276/76
104.167.252.0/2351276/76
198.163.118.0/2351276/76
23.146.32.0/2425676/76
64.72.198.0/2425676/76

Routing health

How AS19523'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

  • Valid61.9%26
  • Invalid0.0%0
  • No ROA38.1%16

Propagation

  • Globally propagated90% of full-feed peers or more100.0%42
  • Partially propagated40% to 90%0.0%0
  • Seen by few peersUnder 40%0.0%0

Prefix sizes

IPv4 — 35 prefixes

IPv6 — 7 prefixes

  • /324.3B × /6428.6%2
  • /36268M × /6414.3%1
  • /4016.8M × /6457.1%4

Recent changes

Announcements that started or stopped since 12th Oct 2026.

No announcement by AS19523 started or stopped in this period.

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