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AS42037Mozilla Corporation

United StatesRegistryRIPE NCC

As of 11th November 2026, AS42037 (Mozilla Corporation), a network registered in the United States with RIPE NCC, originates 1 IPv4 prefix covering 256 addresses and 1 IPv6 prefix. By IPv4 address space that makes it the 59,988th-largest of the 80,763 networks we see originating IPv4, and the 13,090th-largest of 18,758 in the United States. It is seen behind 2 upstream networks, most often AS15695 (Expereo International BV) and AS13237 (euNetworks GmbH). 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

256

IPv6 /64s

65.5k

Upstream graph

The networks AS42037 is seen behind, one and two hops out, drawn from real AS paths.

AS42037Toward the internet core
Upstream graph for AS42037: 5 neighbouring networks observed beyond it across 2 levels. The same networks are listed in the tables below.AS42037Mozilla Corporati…This networkAS13237euNetworks GmbHAS15695Expereo Internati…AS3257GTT Communication…AS1299Arelion (fka. Tel…AS6453TATA Communicatio…

Networks observed one and two hops upstream of AS42037 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
250%
Peers
250%
Downstreams
00%

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

Upstreams of AS42037
NetworkCountryRelationshipPathsVantage pts
AS15695Expereo International BVNLPeer123123
AS13237euNetworks GmbHDEPeer1616

Prefixes

The largest blocks AS42037 originates, widest first.

Largest prefixes originated by AS42037
PrefixAddressesVisibility
185.155.182.0/2425677/77
2a00:8c40:238::/4865.5k × /6462/63

Routing health

How AS42037'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 12th Oct 2026.

No announcement by AS42037 started or stopped in this period.

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