Autonomous system
AS12075 JACOBS
Unclassified ARIN
Summary
Jacobs Engineering Group
enterprise legacy
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-Bto Jacobs Engineering Group, all of them small slices — five/23s and three/24s — taken out of168.88.0.0/16. - The ninth,
209.46.32.0/23, is registered asAMENTUM-ICMS-2to 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
/16rather 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. Source, and how to suggest an edit.
Interconnection
Peering at a glance
Internet exchanges
No exchange port on file. Many exchanges publish no participant list, so this is not proof of absence.
Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-10-24, licensed CC BY-NC-SA 3.0. Transit is inferred from observed BGP paths, never declared by either party.
Address space
Summary
IPv4 8 prefixes · 3.33K addresses IPv6 0 prefixes
| Country | Name | Prefixes |
|---|---|---|
| US | United States of America | 8 |
Registry
Allocation record
- Registry
- ARIN
- Handle
AS12075- Registry name
- JACOBS
- Registrant
- Jacobs Engineering Group Inc.
- Abuse contact
- ip.abuse@jacobs.com
- Registered
- 1999-03-16
- Last changed
- 2023-07-29
- Allocation
- assigned
Routing security
RPKI and IRR
- RPKI
- 0% valid · 0 valid, 12 with no ROA
- ROAs
- 0 authorising AS12075
- ASPA
- no ASPA record
- IRR
- 100% registered · 12 of 12 announcements
- Route objects
- 23 naming AS12075
Reputation
Classification and threat
Unclassified Not in the curated lists. Most of the ~80,000 allocated ASNs are not.
Spamhaus DROP
Not on ASN-DROP The network as a whole is not listed.
No DROP prefixes None of its announced space is on the DROP prefix list.
Spamhaus DROP ("Don't Route Or Peer") lists space and networks run by, or hijacked for, spam and cybercrime operations: 442 networks and 1,779 prefixes, as published 2026-10-24. A short, high-confidence list, so a match is worth taking seriously, and absence from it says little on its own.
FBI IC3
No IC3 indicators Nothing from the FBI IC3 feed.
IC3 threat data is alpha. Absence of an indicator is not evidence of good behaviour, only of absence from this one feed.
Elsewhere