AS12857 — TDS

AS12857 announces 1 IPv4 prefixes covering 256 addresses and 4 IPv6 prefixes.

About this network

One /24 in IPv4, a six-rung ladder in IPv6, 96 neighbours, and a netname dated 1993.

What it's used for

• A German managed-IT and hosting operator. 256 addresses in a single IPv4 prefix, seven IPv6 prefixes, and 96 observed BGP neighbours.

Notable

• The whole IPv4 inventory is 194.147.133.0/24, netname DE-MANAGE-NOW-19930901.
• IPv6 is announced as 2a00:b400::/30, 2a00:b404::/33, 2a00:b404:8000::/34, 2a00:b404:c000::/35, 2a00:b404:f000::/36 and 2a00:b405::/32.
• The AS handle is TDS.
• Three addresses were sampled and none returned a name.

Interesting

• The IPv6 announcements are a halving ladder: a /33, then a /34 starting where it ends, then a /35, then a /36, each covering half of what remains. Every rung except the /30 and /32 sits on an odd boundary, so none of them delegates its reverse zone in one piece. Somebody carved a block by repeatedly splitting it in two and announced every piece separately.
• 96 neighbours on 256 IPv4 addresses is one of the most lopsided ratios in this range. The address count measures what a network hosts; the neighbour count measures who it talks to, and the two have almost nothing to do with each other.
• 19930901 is a four-digit year from September 1993 — six years before the two-digit netnames elsewhere in this range, and one holder here has four-digit dates running back to 1989. The long form was never a later replacement for the short one. Both were available throughout, and netname dates record who filed rather than when the convention stood.

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

Announced prefixes

• 194.147.133.0/24
• 2a00:b400::/29
• 2a00:b404:f000::/36
• 2a00:b405::/32
• 2a00:b406::/31

Upstream networks

• AS21473 PFALZKOM GmbH
• AS34309 Link11 GmbH
• AS6939 Hurricane Electric LLC
• AS34549 meerfarbig GmbH & Co. KG
• AS34019 Hivane Association
• AS12779 IT.Gate S.p.A.
• AS24482 SG.GS
• AS15830 Equinix (EMEA) Acquisition Enterprises B.V.
• AS20485 Joint Stock Company TransTeleCom
• AS48362 Stadtwerke Feldkirch
• AS57463 NetIX Communications JSC
• AS31027 GlobalConnect A/S
• AS37721 Virtual Technologies & Solutions
• AS37100 SEACOM Limited
• AS212024 Marc Schmitt

Downstream networks

• AS49097 Manage Now GmbH

Adjacent networks

• AS49097 Manage Now GmbH
• AS34309 Link11 GmbH
• AS21473 PFALZKOM GmbH
• AS6939 Hurricane Electric LLC
• AS34549 meerfarbig GmbH & Co. KG
• AS15830 Equinix (EMEA) Acquisition Enterprises B.V.
• AS34019 Hivane Association
• AS48362 Stadtwerke Feldkirch
• AS57463 NetIX Communications JSC
• AS37100 SEACOM Limited
• AS24482 SG.GS
• AS20485 Joint Stock Company TransTeleCom
• AS12779 IT.Gate S.p.A.
• AS37721 Virtual Technologies & Solutions
• AS212024 Marc Schmitt
• AS17639 Converge ICT Solutions Inc.
• AS31027 GlobalConnect A/S

Internet exchanges

• DE-CIX Frankfurt — Frankfurt, Germany