AS12075 — JACOBS

AS12075 announces 8 IPv4 prefixes covering 3,328 addresses and 0 IPv6 prefixes.

About this network

Jacobs is one of the largest engineering and professional services firms in the world, and this is its corporate network.

What it's used for

• Corporate connectivity. 3,840 addresses across nine announced prefixes, six observed BGP neighbours, no IPv6 announced.

Notable

• Eight of the nine blocks are registered as JACOBS-B to Jacobs Engineering Group, all of them small slices — five /23s and three /24s — taken out of 168.88.0.0/16.
• The ninth, 209.46.32.0/23, is registered as AMENTUM-ICMS-2 to Amentum Services, Inc., a different company entirely.
• Six neighbours for under four thousand addresses. An end site with several ways out rather than a network carrying anyone else.

Interesting

• That Amentum block is worth pulling on. Jacobs separated its Critical Mission Solutions and cyber and intelligence businesses in 2024 and combined them with Amentum, a government services contractor, into a standalone company. A block registered to Amentum and still announced from the Jacobs AS is the sort of loose end a corporate separation leaves behind: the paperwork moves in one transaction, and the routing moves whenever someone gets to it.
• Announcing nine scattered fragments of a /16 rather than the whole thing is normal for a company that grew by acquisition. Each piece was lit for a different site or business, and nobody has had a reason to tidy the announcement since.

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

Announced prefixes

• 168.88.14.0/23
• 168.88.58.0/23
• 168.88.60.0/23
• 168.88.64.0/23
• 168.88.73.0/24
• 168.88.74.0/23
• 168.88.82.0/24
• 168.88.220.0/24

Upstream networks

• AS23005 SWITCH, LTD
• AS15830 Equinix (EMEA) Acquisition Enterprises B.V.
• AS4755 TATA Communications formerly VSNL is Leading ISP
• AS31242 P4 Sp. z o.o.

Adjacent networks

• AS23005 SWITCH, LTD
• AS15830 Equinix (EMEA) Acquisition Enterprises B.V.
• AS4755 TATA Communications formerly VSNL is Leading ISP
• AS31242 P4 Sp. z o.o.