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AS33727Sumofiber

United StatesRegistryARIN

As of 23rd October 2026, AS33727 (Sumofiber), a network registered in the United States with ARIN, originates 1 IPv4 prefix covering 2k addresses. By IPv4 address space that makes it the 25,332nd-largest of the 79,652 networks we see originating IPv4, and the 6,305th-largest of 18,475 in the United States. It is seen behind 2 upstream networks, most often AS6461 (Zayo Bandwidth) and AS62494 (UTOPIA), and in front of 1 downstream network. None of its announcements have a valid RPKI ROA. 0% of its routes reach at least 90% of full-feed peers, and 1 prefix is also originated by another network.

At a glance

IPv4 prefixes

1

IPv6 prefixes

0

IPv4 addresses

2k

IPv6 /64s

0

Upstream graph

The networks AS33727 is seen behind, one and two hops out, drawn from real AS paths.

AS33727Toward the internet core
Upstream graph for AS33727: 6 neighbouring networks observed beyond it across 2 levels. The same networks are listed in the tables below.AS33727SumofiberThis networkAS6461Zayo BandwidthAS62494UTOPIAAS2914NTT America, Inc.AS32590Valve CorporationAS3356Lumen (Level 3)AS53407UTOPIA Fiber

Networks observed one and two hops upstream of AS33727 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

6

adjacent networks

Upstreams
233%
Peers
350%
Downstreams
117%

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

Upstreams of AS33727
NetworkCountryRelationshipPathsVantage pts
AS6461Zayo BandwidthUSPeer6363
AS62494UTOPIAUSPeer2626

Prefixes

The largest blocks AS33727 originates, widest first.

Largest prefixes originated by AS33727
PrefixAddressesVisibility
38.148.32.0/212k26/77

Routing health

How AS33727'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

  • Valid0.0%0
  • Invalid0.0%0
  • No ROA100.0%1

Propagation

  • Globally propagated90% of full-feed peers or more0.0%0
  • Partially propagated40% to 90%0.0%0
  • Seen by few peersUnder 40%100.0%1

Prefix sizes

IPv4 — 1 prefixes

Recent changes

Announcements that started or stopped since 23rd Sept 2026.

No announcement by AS33727 started or stopped in this period.

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