AS12732 — GUTCON-NET Carrier51 GmbH, GutCon GmbH

AS12732 announces 4 IPv4 prefixes covering 1,792 addresses and 7 IPv6 prefixes.

About this network

Twenty-three IPv6 prefixes against four IPv4 ones, and a hostname that names the firewall model.

What it's used for

• Carrier and hosting services in Germany. 1,792 addresses in four IPv4 prefixes, 23 IPv6 prefixes, and 124 observed BGP neighbours.

Notable

• The IPv6 announcements out of 2001:bf0 form a doubling ladder: two /48s, then a /47, /46, /45, /44 and /43, under a /42.
• The four IPv4 blocks belong to four different holders: SDV Server-Services, GutCon itself, D-hosting die Rackspace & Connectivity GmbH under DE-BBTT-980716, and MAGHAN-NET-2.
• Six sampled addresses answered, under two domains: all.de and mind.de.
• The names include ae10.dh5148a.ak.all.de, srx345.hh.all.de, isp-res-net.mind.de and boerde-tunnel4.mind.de.

Interesting

• 1,792 IPv4 addresses and 23 IPv6 prefixes is the ratio the protocol was meant to produce, and almost nobody has it. The operator ran out of one and stopped trying, then took as much of the other as it needed, and the routing table shows a network whose future and past are visible side by side.
• srx345 names a specific firewall product line in public DNS, and ae10 is an aggregated Ethernet bundle. Interface names of this kind are written for the engineers who maintain the box, and they tell anyone else what hardware sits at that address before a single packet is sent at it.
• Four blocks, four holders, one announcer. A carrier with 124 neighbours and almost no address space of its own is selling routing rather than addresses, which is the purest form of the transit business.

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

Announced prefixes

• 91.199.214.0/24
• 193.34.120.0/22
• 212.21.71.0/24
• 212.42.230.0/24
• 2001:67c:278c::/48
• 2001:67c:27fc::/48
• 2001:bf0::/32
• 2001:bf0:e000::/35
• 2001:bf1::/32
• 2001:bf2::/31
• 2001:bf4::/31

Upstream networks

• AS30742 Bremen Briteline GmbH
• AS3356 Level 3 Parent, LLC
• AS174 Cogent Communications, LLC
• AS6939 Hurricane Electric LLC
• AS5405 Inter.link GmbH
• AS9002 RETN Limited
• AS34549 meerfarbig GmbH & Co. KG
• AS24482 SG.GS
• AS8218 Zayo Infrastructure France SA
• AS20485 Joint Stock Company TransTeleCom
• AS37721 Virtual Technologies & Solutions
• AS37100 SEACOM Limited
• AS212024 Marc Schmitt
• AS34019 Hivane Association
• AS57463 NetIX Communications JSC
• AS48362 Stadtwerke Feldkirch
• AS12859 BIT BV
• AS1836 green.ch AG
• AS12779 IT.Gate S.p.A.

Downstream networks

• AS8875 sinma GmbH
• AS44716 D-hosting die Rackspace & Connectivity GmbH
• AS15657 Speedbone Internet & Connectivity GmbH
• AS203965 FRITZ! Technology GmbH
• AS25516 init AG fuer digitale Kommunikation
• AS201257 Johannes Behrndt
• AS39614 Dawico Deutschland GmbH

Adjacent networks

• AS8875 sinma GmbH
• AS3356 Level 3 Parent, LLC
• AS5405 Inter.link GmbH
• AS44716 D-hosting die Rackspace & Connectivity GmbH
• AS174 Cogent Communications, LLC
• AS15657 Speedbone Internet & Connectivity GmbH
• AS6939 Hurricane Electric LLC
• AS30742 Bremen Briteline GmbH
• AS203965 FRITZ! Technology GmbH
• AS25516 init AG fuer digitale Kommunikation
• AS34549 meerfarbig GmbH & Co. KG
• AS24482 SG.GS
• AS201257 Johannes Behrndt
• AS9002 RETN Limited
• AS29632 Netassist International EOOD
• AS8218 Zayo Infrastructure France SA
• AS39614 Dawico Deutschland GmbH
• AS48362 Stadtwerke Feldkirch
• AS37721 Virtual Technologies & Solutions
• AS34019 Hivane Association
• AS17639 Converge ICT Solutions Inc.
• AS212024 Marc Schmitt
• AS213241 TECHIT.BE SRL
• AS12859 BIT BV
• AS1836 green.ch AG

Internet exchanges

• DE-CIX Frankfurt — Frankfurt, Germany
• Berlin Commercial Internet Exchange — Berlin, Germany
• Megaport Dusseldorf IX — Düsseldorf, Germany
• Megaport Hamburg IX — Hamburg, Germany
• Megaport Berlin IX — Berlin, Germany