Autonomous system
AS51100 KIER
Unclassified RIPE
Summary
Kier Group
business construction infrastructure corporate
KIER is the autonomous system for Kier Group plc, a major British construction and infrastructure services company.
What it's used for
- The address space is registered under netnames
UK-KIERLTD-20180104andUK-KIERLTD-20070911, both assigned to Kier Ltd, indicating a corporate internal network rather than a public service provider. - The AS announces 1536 IPv4 addresses across 2 prefixes (
185.239.164.0/22and91.195.112.0/23) with only 1 observed neighbour, a ratio consistent with a single-site or small-scale corporate estate rather than a transit or access network. - Traffic from this AS consists of internal corporate communications, office workers, and infrastructure management endpoints for Kier's construction and property operations.
Notable
- Registrants for both announced prefixes are listed as Kier Ltd, aligning perfectly with the AS holder and confirming the space is owned and operated by the same entity.
- Kier Group plc is a leading provider of construction, infrastructure, and property developments in the UK, with divisions in transportation, building, and support services.
- The inventory consists of two distinct IPv4 blocks, one acquired in 2007 and the other in 2018, reflecting the company's growth and expansion of its digital infrastructure over time.
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.
Transit providers
1 upstream, 0 downstream and 1 adjacent networks observed; most-used upstreams first.
| AS | Network | Paths seen |
|---|---|---|
| AS1273 | IDDQD-AS | 409 |
Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-10-14, licensed CC BY-NC-SA 3.0. Transit is inferred from observed BGP paths, never declared by either party.
Address space
Summary
IPv4 2 prefixes · 1.54K addresses IPv6 0 prefixes
| Country | Name | Prefixes |
|---|---|---|
| GB | United Kingdom | 2 |
Registry
Allocation record
- Registry
- RIPE
- Handle
AS51100- Registry name
- Kier
- Registrant
- Kier Ltd
- Abuse contact
- abuse@kier.co.uk
- Registered
- 2018-01-04
- Last changed
- 2024-06-25
- Allocation
- allocated
Routing security
RPKI and IRR
- RPKI
- 0% valid · 0 valid, 7 with no ROA
- ROAs
- 0 authorising AS51100
- ASPA
- no ASPA record
- IRR
- 100% registered · 7 of 7 announcements
- Route objects
- 8 naming AS51100
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 1,771 prefixes, as published 2026-10-15. 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