ASN AS42081 is an Autonomous System Number used to identify a network for BGP internet routing.

Who manages ASN AS42081?

AS42081 is listed under European Centre for Medium Range Weather Forecasts ECMWF.

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.

AS42081 European Centre for Medium Range Weather Forecasts ECMWF

ASN Lookup Tool

European Centre for Medium Range Weather Forecasts ECMWF ecmwf.int

GB 11 Routes

AS Data

AS42081

AS42081 – European Centre for Medium Range Weather Forecasts ECMWF

AS Number	42081
AS Name	ecmwf-it
Organization	European Centre for Medium Range Weather Forecasts ECMWF (org-ecfm5-ripe)
Country	GB
Website	ecmwf.int
Number of IPv4 Routes	9
Number of IPv6 Routes	2
ASN type	GOVERNMENT
Allocation Status	ASSIGNED
Registry	RIPE
Date Allocated	2018-12-14

ASN Intelligence API for production workflows

Use ASN data for AS42081 in automation: routing intelligence, peering analysis, ownership checks, and network observability.

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IP Ranges

Route	Origin	Origin Name	ISP	# IPs
136.156.192.0/18	AS42081	European Centre for Medium Range Weather Forecasts ECMWF	European Centre for Medium Range Weather Forecasts ECMWF	16384
136.156.40.0/21	AS42081	European Centre for Medium Range Weather Forecasts ECMWF	European Centre for Medium Range Weather Forecasts ECMWF	2048
2a09:9180:ecfb::/48	AS42081	European Centre for Medium Range Weather Forecasts ECMWF	European Centre for Medium Range Weather Forecasts ECMWF	~1×10²⁴
77.83.226.0/24	AS42081	European Centre for Medium Range Weather Forecasts ECMWF	European Centre for Medium Range Weather Forecasts ECMWF	256
136.156.195.68/30	AS42081	European Centre for Medium Range Weather Forecasts ECMWF	European Centre for Medium Range Weather Forecasts ECMWF	4
136.156.195.64/30	AS42081	European Centre for Medium Range Weather Forecasts ECMWF	European Centre for Medium Range Weather Forecasts ECMWF	4
2a09:9180:ecfd::/48	AS42081	European Centre for Medium Range Weather Forecasts ECMWF	European Centre for Medium Range Weather Forecasts ECMWF	~1×10²⁴
136.156.128.0/20	AS42081	European Centre for Medium Range Weather Forecasts ECMWF	European Centre for Medium Range Weather Forecasts ECMWF	4096
136.156.144.0/20	AS42081	European Centre for Medium Range Weather Forecasts ECMWF	European Centre for Medium Range Weather Forecasts ECMWF	4096
77.83.224.0/23	AS42081	European Centre for Medium Range Weather Forecasts ECMWF	European Centre for Medium Range Weather Forecasts ECMWF	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 'AS40960 - AS42171'

as-block:       AS40960 - AS42171
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:        2024-07-22T14:14:32Z
last-modified:  2024-07-22T14:14:32Z
source:         RIPE

% Information related to 'AS42081'

% Abuse contact for 'AS42081' is 'netsec-ext@ecmwf.int'

aut-num:        AS42081
as-name:        ecmwf-it
org:            ORG-ECFM5-RIPE
import:         from AS137 accept ANY
export:         to AS137 announce AS42081
import:         from AS8928 accept ANY
export:         to AS8928 announce AS42081
import:         from AS31638 accept ANY
export:         to AS31638 announce AS42081
admin-c:        EC10273-RIPE
tech-c:         EC10273-RIPE
status:         ASSIGNED
mnt-by:         ecmwf-mnt
mnt-by:         RIPE-NCC-END-MNT
created:        2018-12-14T09:54:02Z
last-modified:  2022-10-08T17:39:51Z
source:         RIPE

organisation:   ORG-ECFM5-RIPE
org-name:       European Centre for Medium-Range Weather Forecasts (ECMWF)
country:        GB
org-type:       LIR
address:        Shinfield Park
address:        RG29AX
address:        READING
address:        UNITED KINGDOM
phone:          +44 118 949 9000
admin-c:        EC10273-RIPE
tech-c:         EC10273-RIPE
abuse-c:        AR49834-RIPE
mnt-ref:        ecmwf-mnt
mnt-by:         RIPE-NCC-HM-MNT
mnt-by:         ecmwf-mnt
created:        2018-12-13T07:09:07Z
last-modified:  2024-02-19T14:18:18Z
source:         RIPE # Filtered

role:           ECMWF NETSEC admin and tech contacts
org:            ORG-ECFM5-RIPE
address:        ECMWF Shinfield Park, Reading, RG2 9AX, United Kingdom
address:        ECMWF Tecnopolo di Bologna, Via Stalingrado 84/3, 40128 Bologna, Italy
address:        ECMWF Robert-Schuman-Platz 3, 53175 Bonn, Germany
phone:          +44 118 949 9000
admin-c:        SB29442-RIPE
admin-c:        HEG28-RIPE
admin-c:        JS24056-RIPE
tech-c:         SB29442-RIPE
tech-c:         HEG28-RIPE
tech-c:         JS24056-RIPE
nic-hdl:        EC10273-RIPE
mnt-by:         ecmwf-mnt
created:        2022-10-08T16:57:38Z
last-modified:  2023-03-21T14:55:15Z
source:         RIPE # Filtered

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

Parsed Whois Response

{
  "status" : true,
  "whois_server" : "whois.ripe.net",
  "as_blocks" : [ {
    "as_block" : "AS40960 - AS42171",
    "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" : "2024-07-22",
    "date_updated" : "2024-07-22",
    "source" : "RIPE"
  } ],
  "aut_nums" : [ {
    "aut_num" : "AS42081",
    "as_name" : "ecmwf-it",
    "status" : "ASSIGNED",
    "import" : [ "from AS137 accept ANY", "from AS8928 accept ANY", "from AS31638 accept ANY" ],
    "export" : [ "to AS137 announce AS42081", "to AS8928 announce AS42081", "to AS31638 announce AS42081" ],
    "organization" : "ORG-ECFM5-RIPE",
    "admin_contacts" : [ "EC10273-RIPE" ],
    "tech_contacts" : [ "EC10273-RIPE" ],
    "mnt_by" : [ "ecmwf-mnt", "RIPE-NCC-END-MNT" ],
    "date_created" : "2018-12-14",
    "date_updated" : "2022-10-08",
    "source" : "RIPE"
  } ],
  "organization" : {
    "handle" : "ORG-ECFM5-RIPE",
    "name" : "European Centre for Medium-Range Weather Forecasts (ECMWF)",
    "type" : "LIR",
    "address" : [ "Shinfield Park", "RG29AX", "READING", "UNITED KINGDOM" ],
    "street" : "Shinfield Park",
    "city" : "Reading",
    "zip_code" : "RG29AX",
    "country" : [ "GB" ],
    "phone" : [ "+44 118 949 9000" ],
    "admin_contacts" : [ "EC10273-RIPE" ],
    "tech_contacts" : [ "EC10273-RIPE" ],
    "abuse_contacts" : [ "AR49834-RIPE" ],
    "mnt_ref" : [ "ecmwf-mnt" ],
    "mnt_by" : [ "RIPE-NCC-HM-MNT", "ecmwf-mnt" ],
    "date_created" : "2018-12-13",
    "date_updated" : "2024-02-19",
    "source" : "RIPE",
    "addressCountry" : "UNITED KINGDOM"
  },
  "administrative_contacts" : [ {
    "handle" : "EC10273-RIPE",
    "name" : "ECMWF NETSEC admin and tech contacts",
    "address" : [ "ECMWF Shinfield Park, Reading, RG2 9AX, United Kingdom", "ECMWF Tecnopolo di Bologna, Via Stalingrado 84/3, 40128 Bologna, Italy", "ECMWF Robert-Schuman-Platz 3, 53175 Bonn, Germany" ],
    "street" : "Robert-schuman-platz",
    "city" : "Bonn",
    "zip_code" : "53175",
    "country" : "GERMANY",
    "phone" : [ "+44 118 949 9000" ],
    "organizations" : [ "ORG-ECFM5-RIPE" ],
    "admin_contacts" : [ "SB29442-RIPE", "HEG28-RIPE", "JS24056-RIPE" ],
    "tech_contacts" : [ "SB29442-RIPE", "HEG28-RIPE", "JS24056-RIPE" ],
    "mnt_by" : [ "ecmwf-mnt" ],
    "date_created" : "2022-10-08",
    "date_updated" : "2023-03-21",
    "source" : "RIPE",
    "addressCountry" : "GERMANY"
  } ],
  "technical_contacts" : [ {
    "handle" : "EC10273-RIPE",
    "name" : "ECMWF NETSEC admin and tech contacts",
    "address" : [ "ECMWF Shinfield Park, Reading, RG2 9AX, United Kingdom", "ECMWF Tecnopolo di Bologna, Via Stalingrado 84/3, 40128 Bologna, Italy", "ECMWF Robert-Schuman-Platz 3, 53175 Bonn, Germany" ],
    "street" : "Robert-schuman-platz",
    "city" : "Bonn",
    "zip_code" : "53175",
    "country" : "GERMANY",
    "phone" : [ "+44 118 949 9000" ],
    "organizations" : [ "ORG-ECFM5-RIPE" ],
    "admin_contacts" : [ "SB29442-RIPE", "HEG28-RIPE", "JS24056-RIPE" ],
    "tech_contacts" : [ "SB29442-RIPE", "HEG28-RIPE", "JS24056-RIPE" ],
    "mnt_by" : [ "ecmwf-mnt" ],
    "date_created" : "2022-10-08",
    "date_updated" : "2023-03-21",
    "source" : "RIPE",
    "addressCountry" : "GERMANY"
  } ]
}

Peers

AS Number	Description	Country
AS8928	GTT Communications Inc.	US
AS31638	Lepida S.c.p.A.	IT
AS137	Consortium GARR	IT

Upstreams

AS Number	Description	Country
AS31638	Lepida S.c.p.A.	IT
AS137	Consortium GARR	IT