ASN AS51100 is an Autonomous System Number used to identify a network for BGP internet routing.

Who manages ASN AS51100?

AS51100 is listed under Kier Ltd.

What do peers, upstreams, and downstreams mean in ASN data?

Peers are lateral network interconnections, upstreams are transit providers, and downstreams are customer networks receiving connectivity.

What are routes and IP ranges for an ASN?

Routes and IP ranges are the network prefixes announced by the ASN on the internet and show the address space it originates.

Why is WHOIS data shown for an ASN?

WHOIS data provides registration and contact context for ASN ownership, administration, and operational reference.

How can I access the full ASN tables?

The page shows a preview of large ASN datasets. Use the page controls to load more rows, and upgrade to a paid plan for complete access.

AS51100 Kier Ltd | IPGeolocation.io

ASN Lookup Tool

Kier Ltd kier.co.uk

GB 7 Routes

AS Data

AS51100

AS51100 – Kier Ltd

AS Number	51100
AS Name	Kier
Organization	Kier Ltd (org-kl233-ripe)
Country	GB
Website	kier.co.uk
Number of IPv4 Routes	7
Number of IPv6 Routes	0
ASN type	BUSINESS
Allocation Status	ASSIGNED
Registry	RIPE
Date Allocated	2018-01-04

ASN Intelligence API for production workflows

Use ASN data for AS51100 in automation: routing intelligence, peering analysis, ownership checks, and network observability.

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IP Ranges

Route	Origin	Origin Name	ISP	# IPs
91.195.112.0/23	AS51100	Kier Ltd	Kier Ltd	512
185.239.166.0/24	AS51100	Kier Ltd	Kier Ltd	256
91.195.112.0/24	AS51100	Kier Ltd	Kier Ltd	256
185.239.167.0/24	AS51100	Kier Ltd	Kier Ltd	256
185.239.164.0/23	AS51100	Kier Ltd	Kier Ltd	512
91.195.113.0/24	AS51100	Kier Ltd	Kier Ltd	256
185.239.166.0/23	AS51100	Kier Ltd	Kier Ltd	512

Raw Whois Response

% This is the RIPE Database query service.
% The objects are in RPSL format.
%
% The RIPE Database is subject to Terms and Conditions.
% See https://docs.db.ripe.net/terms-conditions.html

% Note: this output has been filtered.
%       To receive output for a database update, use the "-B" flag.

% Information related to 'AS50893 - AS51311'

as-block:       AS50893 - AS51311
descr:          RIPE NCC ASN block
remarks:        These AS Numbers are assigned to network operators in the RIPE NCC service region.
mnt-by:         RIPE-NCC-HM-MNT
created:        2024-12-10T14:54:30Z
last-modified:  2024-12-10T14:54:30Z
source:         RIPE

% Information related to 'AS51100'

% Abuse contact for 'AS51100' is 'abuse@kier.co.uk'

aut-num:        AS51100
as-name:        Kier
org:            ORG-KL233-RIPE
import:         from AS1273 accept ANY
export:         to AS1273 announce AS51100
admin-c:        AA43437-RIPE
tech-c:         TA9096-RIPE
abuse-c:        AR44377-RIPE
status:         ASSIGNED
mnt-by:         RIPE-NCC-END-MNT
mnt-by:         uk-kierltd-1-mnt
created:        2018-01-04T15:31:34Z
last-modified:  2024-06-25T16:17:07Z
source:         RIPE # Filtered

organisation:   ORG-KL233-RIPE
org-name:       Kier Ltd
country:        GB
org-type:       LIR
address:        2nd Floor, Optimum House, Clippers Quay
address:        M50 3XP
address:        Salford
address:        UNITED KINGDOM
phone:          +44 0161 656 9400
admin-c:        AA43437-RIPE
tech-c:         TA9096-RIPE
abuse-c:        AR44377-RIPE
mnt-ref:        uk-kierltd-1-mnt
mnt-by:         RIPE-NCC-HM-MNT
mnt-by:         uk-kierltd-1-mnt
created:        2017-12-20T08:15:32Z
last-modified:  2024-06-27T07:10:32Z
source:         RIPE # Filtered

role:           Admin-C
address:        2nd Floor, Optimum House
address:        Clippers Quay
address:        Salford
address:        M50 3XP
address:        England, UK
org:            ORG-KL233-RIPE
tech-c:         TA9096-RIPE
nic-hdl:        AA43437-RIPE
mnt-by:         uk-kierltd-1-mnt
created:        2024-06-25T16:03:11Z
last-modified:  2024-06-25T16:12:40Z
source:         RIPE # Filtered

role:           Tech-C
address:        2nd Floor, Optimum House
address:        Clippers Quay
address:        Salford
address:        M50 3XP
address:        England, UK
org:            ORG-KL233-RIPE
admin-c:        AA43437-RIPE
nic-hdl:        TA9096-RIPE
mnt-by:         uk-kierltd-1-mnt
created:        2024-06-25T16:05:31Z
last-modified:  2024-06-25T16:13:26Z
source:         RIPE # Filtered

% This query was served by the RIPE Database Query Service version 1.121.2 (BUSA)

Parsed Whois Response

{
  "status" : true,
  "whois_server" : "whois.ripe.net",
  "as_blocks" : [ {
    "as_block" : "AS50893 - AS51311",
    "description" : [ "RIPE NCC ASN block" ],
    "remarks" : [ "These AS Numbers are assigned to network operators in the RIPE NCC service region." ],
    "mnt_by" : [ "RIPE-NCC-HM-MNT" ],
    "date_created" : "2024-12-10",
    "date_updated" : "2024-12-10",
    "source" : "RIPE"
  } ],
  "aut_nums" : [ {
    "aut_num" : "AS51100",
    "as_name" : "Kier",
    "status" : "ASSIGNED",
    "import" : [ "from AS1273 accept ANY" ],
    "export" : [ "to AS1273 announce AS51100" ],
    "organization" : "ORG-KL233-RIPE",
    "admin_contacts" : [ "AA43437-RIPE" ],
    "tech_contacts" : [ "TA9096-RIPE" ],
    "abuse_contacts" : [ "AR44377-RIPE" ],
    "mnt_by" : [ "RIPE-NCC-END-MNT", "uk-kierltd-1-mnt" ],
    "date_created" : "2018-01-04",
    "date_updated" : "2024-06-25",
    "source" : "RIPE"
  } ],
  "organization" : {
    "handle" : "ORG-KL233-RIPE",
    "name" : "Kier Ltd",
    "type" : "LIR",
    "address" : [ "2nd Floor, Optimum House, Clippers Quay", "M50 3XP", "Salford", "UNITED KINGDOM" ],
    "street" : "Clippers Quay",
    "city" : "Salford",
    "zip_code" : "M50 3XP",
    "country" : [ "GB" ],
    "phone" : [ "+44 0161 656 9400" ],
    "admin_contacts" : [ "AA43437-RIPE" ],
    "tech_contacts" : [ "TA9096-RIPE" ],
    "abuse_contacts" : [ "AR44377-RIPE" ],
    "mnt_ref" : [ "uk-kierltd-1-mnt" ],
    "mnt_by" : [ "RIPE-NCC-HM-MNT", "uk-kierltd-1-mnt" ],
    "date_created" : "2017-12-20",
    "date_updated" : "2024-06-27",
    "source" : "RIPE",
    "addressCountry" : "UNITED KINGDOM"
  },
  "administrative_contacts" : [ {
    "handle" : "AA43437-RIPE",
    "name" : "Admin-C",
    "address" : [ "2nd Floor, Optimum House", "Clippers Quay", "Salford", "M50 3XP", "England, UK" ],
    "street" : "Clippers Quay",
    "city" : "Salford",
    "state" : "ENGLAND",
    "zip_code" : "M50 3XP",
    "country" : "UK",
    "organizations" : [ "ORG-KL233-RIPE" ],
    "tech_contacts" : [ "TA9096-RIPE" ],
    "mnt_by" : [ "uk-kierltd-1-mnt" ],
    "date_created" : "2024-06-25",
    "date_updated" : "2024-06-25",
    "source" : "RIPE",
    "addressCountry" : "UK"
  } ],
  "technical_contacts" : [ {
    "handle" : "TA9096-RIPE",
    "name" : "Tech-C",
    "address" : [ "2nd Floor, Optimum House", "Clippers Quay", "Salford", "M50 3XP", "England, UK" ],
    "street" : "Clippers Quay",
    "city" : "Salford",
    "state" : "ENGLAND",
    "zip_code" : "M50 3XP",
    "country" : "UK",
    "organizations" : [ "ORG-KL233-RIPE" ],
    "admin_contacts" : [ "AA43437-RIPE" ],
    "mnt_by" : [ "uk-kierltd-1-mnt" ],
    "date_created" : "2024-06-25",
    "date_updated" : "2024-06-25",
    "source" : "RIPE",
    "addressCountry" : "UK"
  } ]
}

Peers

AS Number	Description	Country
AS65136
AS1273	Vodafone Group PLC	GB
AS1273	Vodafone Group PLC	NL
AS65138

Upstreams

AS Number	Description	Country
AS1273	Vodafone Group PLC	NL