AS12643 — IGD

AS12643 announces 5 IPv4 prefixes covering 70,144 addresses and 2 IPv6 prefixes.

About this network

A research institute's /16, alongside blocks named for whether they are intranet or explicitly not.

What it's used for

• Connectivity for a German applied-research institute. 70,144 addresses in five IPv4 prefixes, two IPv6 prefixes, and two observed BGP neighbours.

Notable

• 146.140.0.0/16 holds 65,536 of the 70,144 addresses, netname IGD.
• 153.96.244.0/22 is netname FRAUNHOFER-INTRANET-96, registered through Fraunhofer Netzzentrum.
• 129.233.208.0/23 is Fraunhofer-129-233-NO-Intranet-2.
• The registry lookup for 192.44.32.0/22 failed, so nothing is known here about that block.
• The IPv6 announcements are 2001:67c:134::/48 and 2a03:db80:3410::/48.
• Fifteen sampled addresses were queried and none returned a name.

Interesting

• One netname says intranet and another says the opposite, in the same organisation's inventory, and both blocks are announced to the global routing table. The word is being used for an internal administrative distinction rather than for reachability, and somebody found it worth recording which side of that line each block falls on. The NO- prefix is the rarer half: naming a thing for what it is not.
• A /16 is a legacy class B, issued when a research institute could ask for 65,536 addresses and be given them. Two observed neighbours for that much space is the academic pattern — enormous address holdings reached through one or two national research networks.
• Blocks from 129, 146, 153, 192.44 and 192.67 span four distinct eras of allocation policy, all still in service.

This description is AI-generated, best-effort context — not authoritative, and provided without any guarantee of accuracy.

Announced prefixes

• 129.233.208.0/23
• 146.140.0.0/16
• 153.96.244.0/22
• 192.44.32.0/22
• 192.67.200.0/21
• 2001:67c:134::/48
• 2a03:db80:3410::/48

Upstream networks

• AS8365 Man-da.de GmbH
• AS680 Verein zur Foerderung eines Deutschen Forschungsnetzes e.V.

Adjacent networks

• AS8365 Man-da.de GmbH
• AS680 Verein zur Foerderung eines Deutschen Forschungsnetzes e.V.