subnet.im

AS19718MCNC

United StatesRegistryARIN

As of 22nd October 2026, AS19718 (MCNC), a network registered in the United States with ARIN, originates 1 IPv4 prefix covering 4.1k addresses and 1 IPv6 prefix. By IPv4 address space that makes it the 17,057th-largest of the 79,663 networks we see originating IPv4, and the 4,795th-largest of 18,476 in the United States. It is seen behind 1 upstream network, most often AS81 (MCNC), 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.

At a glance

IPv4 prefixes

1

IPv6 prefixes

1

IPv4 addresses

4.1k

IPv6 /64s

65.5k

Upstream graph

The networks AS19718 is seen behind, one and two hops out, drawn from real AS paths.

AS19718Toward the internet core
Upstream graph for AS19718: 3 neighbouring networks observed beyond it across 2 levels. The same networks are listed in the tables below.AS19718MCNCThis networkAS81MCNCAS174Cogent Communicat…AS3356Lumen (Level 3)

Networks observed one and two hops upstream of AS19718 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

4

adjacent networks

Upstreams
125%
Peers
250%
Downstreams
125%

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

Upstreams of AS19718
NetworkCountryRelationshipPathsVantage pts
AS81MCNCUSPeer214138

Prefixes

The largest blocks AS19718 originates, widest first.

Largest prefixes originated by AS19718
PrefixAddressesVisibility
152.22.240.0/204.1k76/77
2610:28:f020::/4865.5k × /6462/64

Routing health

How AS19718'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%2
  • Invalid0.0%0
  • No ROA0.0%0

Propagation

  • Globally propagated90% of full-feed peers or more100.0%2
  • Partially propagated40% to 90%0.0%0
  • Seen by few peersUnder 40%0.0%0

Prefix sizes

IPv4 — 1 prefixes

IPv6 — 1 prefixes

  • /4865.5k × /64100.0%1

Recent changes

Announcements that started or stopped since 22nd Sept 2026.

No announcement by AS19718 started or stopped in this period.

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