AS12676 — NCORE-AS HKN GmbH

AS12676 announces 11 IPv4 prefixes covering 74,496 addresses and 6 IPv6 prefixes.

About this network

A German carrier with 125 neighbours, four other companies' address blocks, and IPv6 prefixes cut on boundaries that reverse DNS cannot follow.

What it's used for

• Access and transit in Germany. 74,496 addresses in eleven IPv4 prefixes, six IPv6 prefixes, and 125 observed BGP neighbours.

Notable

• Netnames trace the company's own allocations: DE-NCORE-990827, DE-NCORE-991123, DE-NCORE-20051207 on three separate blocks, and DE-NCORE-20150309.
• Four blocks belong to other organisations: dng IT GmbH, ibeco-Systems GmbH, cojama Infosystems GmbH, and one named ANTISPAMEUROPE-NET.
• The IPv6 announcements include a /39 and two /34s: 2a02:4c00::/39, 2a02:4c07:4000::/34 and 2a02:4c07:8000::/34.
• Two sampled addresses answered, as dynamic-0-4-205-88.b2bdsl.de and dynamic-255-7-205-88.b2bdsl.de.

Interesting

• Those /34 and /39 boundaries do not land on a multiple of four bits, and reverse DNS for IPv6 is delegated one hexadecimal digit at a time. A prefix that ends mid-digit cannot be handed to a customer as a single reverse zone; it has to be delegated as several, or not at all. Choosing such a size buys precise address accounting and pays for it in every reverse lookup afterwards.
• The hostnames read dynamic on a product named b2bdsl, business DSL. The two ideas sit badly together: a business line usually implies a fixed address, and the template says otherwise. Both sampled names are the first and last address of their subnets, so the naming is generated across the whole range regardless of which addresses a customer can use.
• Announcing four other companies' registrations alongside its own is what distinguishes a carrier from a hosting provider. The customers keep their registry identity; only the routing is bought.

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

Announced prefixes

• 88.205.0.0/20
• 88.205.32.0/19
• 88.205.64.0/18
• 91.208.74.0/24
• 94.100.134.0/24
• 109.234.248.0/21
• 185.90.228.0/22
• 185.146.60.0/22
• 193.143.122.0/24
• 212.46.96.0/19
• 213.9.0.0/17
• 2a01:6780:4::/48
• 2a01:a740::/32
• 2a02:4c00::/39
• 2a02:4c07:4000::/34
• 2a02:4c07:8000::/34
• 2a0d:2146:8660::/48

Upstream networks

• AS6939 Hurricane Electric LLC
• AS1299 Arelion Sweden AB
• AS3257 GTT Communications Inc.
• AS174 Cogent Communications, LLC
• AS34549 meerfarbig GmbH & Co. KG
• AS12859 BIT BV
• AS42708 Glesys AB
• AS24482 SG.GS
• AS48362 Stadtwerke Feldkirch
• AS212024 Marc Schmitt
• AS12779 IT.Gate S.p.A.
• AS20485 Joint Stock Company TransTeleCom
• AS37100 SEACOM Limited
• AS57463 NetIX Communications JSC
• AS3320 Deutsche Telekom AG
• AS37721 Virtual Technologies & Solutions
• AS1836 green.ch AG
• AS34019 Hivane Association
• AS29632 Netassist International EOOD
• AS213241 TECHIT.BE SRL
• AS56662 Marcin Gondek

Downstream networks

• AS215341 Host-On Service Provider GmbH
• AS205734 Copart UK Limited
• AS197435 deep worx GmbH
• AS47461 Starhome Mach GmbH
• AS27173 Sightcall Inc.
• AS203427 Comdesk GmbH
• AS203777 cloudopserve GmbH
• AS209034 Happyware Server Europe GmbH
• AS40999 dus.net GmbH

Adjacent networks

• AS1299 Arelion Sweden AB
• AS6939 Hurricane Electric LLC
• AS215341 Host-On Service Provider GmbH
• AS205734 Copart UK Limited
• AS3257 GTT Communications Inc.
• AS174 Cogent Communications, LLC
• AS197435 deep worx GmbH
• AS34549 meerfarbig GmbH & Co. KG
• AS27173 Sightcall Inc.
• AS47461 Starhome Mach GmbH
• AS203427 Comdesk GmbH
• AS203777 cloudopserve GmbH
• AS209034 Happyware Server Europe GmbH
• AS24482 SG.GS
• AS42708 Glesys AB
• AS48362 Stadtwerke Feldkirch
• AS12859 BIT BV
• AS212024 Marc Schmitt
• AS37100 SEACOM Limited
• AS57463 NetIX Communications JSC
• AS20485 Joint Stock Company TransTeleCom
• AS12779 IT.Gate S.p.A.
• AS34019 Hivane Association
• AS37721 Virtual Technologies & Solutions
• AS1836 green.ch AG

Internet exchanges

• DE-CIX Frankfurt — Frankfurt, Germany
• Megaport Dusseldorf IX — Düsseldorf, Germany