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AS42821K&K Kommunikationssysteme GmbH

GermanyRegistryRIPE NCC

As of 27th September 2026, AS42821 (K&K Kommunikationssysteme GmbH), a network registered in Germany with RIPE NCC, originates 17 IPv4 prefixes covering 4.4k addresses and 2 IPv6 prefixes. By IPv4 address space that makes it the 16,612th-largest of the 79,516 networks we see originating IPv4, and the 598th-largest of 2,288 in Germany. It is seen behind 2 upstream networks, most often AS8767 (M-net Telekommunikations GmbH) and AS34927 (iFog 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

17

IPv6 prefixes

2

IPv4 addresses

4.4k

IPv6 /64s

8.6B

Upstream graph

The networks AS42821 is seen behind, one and two hops out, drawn from real AS paths.

AS42821Toward the internet core
Upstream graph for AS42821: 6 neighbouring networks observed beyond it across 2 levels. The same networks are listed in the tables below.AS42821K&K Kommunikation…This networkAS8767M-net Telekommuni…AS34927iFog GmbHAS2914NTT America, Inc.AS3356Lumen (Level 3)AS6939Hurricane Electri…AS9002RETN Limited

Networks observed one and two hops upstream of AS42821 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 AS42821
NetworkCountryRelationshipPathsVantage pts
AS8767M-net Telekommunikations GmbHDEPeer1,260144
AS34927iFog GmbHCHPeer24080

Prefixes

The largest blocks AS42821 originates, widest first.

Largest prefixes originated by AS42821
PrefixAddressesVisibility
77.90.128.0/2425681/81
77.90.129.0/2425681/81
77.90.130.0/2425681/81
77.90.132.0/2425681/81
77.90.133.0/2425681/81
77.90.134.0/2425681/81
77.90.136.0/2425681/81
77.90.137.0/2425681/81
77.90.140.0/2425681/81
77.90.143.0/2425681/81

Routing health

How AS42821'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%19
  • Invalid0.0%0
  • No ROA0.0%0

Propagation

  • Globally propagated90% of full-feed peers or more100.0%19
  • Partially propagated40% to 90%0.0%0
  • Seen by few peersUnder 40%0.0%0

Prefix sizes

IPv4 — 17 prefixes

IPv6 — 2 prefixes

  • /324.3B × /64100.0%2

Recent changes

Announcements that started or stopped since 28th Aug 2026.

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