AS13167 — MERCK-KGAA Darmstadt Germany

AS13167 announces 2 IPv4 prefixes covering 67,584 addresses and 16 IPv6 prefixes.

About this network

The IPv6 announcements double in size at every step, the signature of an automated range splitter.

What it's used for

• The corporate network of a German pharmaceutical and chemicals company. 67,584 addresses across five IPv4 prefixes, sixteen IPv6 prefixes, and four observed BGP neighbours.

Notable

• The IPv6 list runs 2001:4cf8:2001::/48, 2002::/47, 2004::/46, 2008::/45, 2010::/44, 2020::/43, 2040::/42, 2080::/41, 2100::/40, under a parent 2001:4cf8::/35.
• The largest IPv4 prefix is 155.250.0.0/16; its registry lookup failed.
• The AS handle is MERCK-KGAA Darmstadt Germany, with two spaces before the country.
• Fifteen addresses were sampled and none returned a name.

Interesting

• Each of those IPv6 prefixes is exactly twice the previous one, starting at the boundary immediately after it ends. That is what happens when software is asked to cover a range whose edges do not fall on a single prefix boundary: it emits the smallest set that fits, and the sizes cascade. No person chooses nine prefixes in that pattern.
• The parent /35 is announced alongside the pieces, so the covering route and the specifics are both in the table at once.
• Four neighbours for a 67,000-address corporate network is a company buying resilient connectivity rather than selling any, which is what nearly every enterprise AS number is for.

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

Announced prefixes

• 85.238.136.0/21
• 155.250.0.0/16
• 2001:4cf8::/35
• 2001:4cf8:2001::/48
• 2001:4cf8:2002::/47
• 2001:4cf8:2004::/46
• 2001:4cf8:2008::/45
• 2001:4cf8:2010::/44
• 2001:4cf8:2020::/43
• 2001:4cf8:2040::/42
• 2001:4cf8:2080::/41
• 2001:4cf8:2100::/40
• 2001:4cf8:2200::/39
• 2001:4cf8:2400::/38
• 2001:4cf8:2800::/37
• 2001:4cf8:3000::/36
• 2001:4cf8:4000::/34
• 2001:4cf8:8000::/33

Upstream networks

• AS3758 SingNet
• AS8220 COLT Technology Services Group Limited
• AS12897 ENTEGA Medianet GmbH
• AS4657 StarHub Ltd

Adjacent networks

• AS3758 SingNet
• AS8220 COLT Technology Services Group Limited
• AS12897 ENTEGA Medianet GmbH
• AS4657 StarHub Ltd