ASN AS51941 is an Autonomous System Number used to identify a network for BGP internet routing.

Who manages ASN AS51941?

AS51941 is listed under BaseN Oy.

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.

AS51941 BaseN Oy | IPGeolocation.io

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BaseN Oy basen.net

FI 10 Routes

AS Data

AS51941

AS51941 – BaseN Oy

AS Number	51941
AS Name	BASEN-EU
Organization	BaseN Oy (org-bc19-ripe)
Country	FI
Website	basen.net
Number of IPv4 Routes	5
Number of IPv6 Routes	5
ASN type	BUSINESS
Allocation Status	ASSIGNED
Registry	RIPE
Date Allocated	2010-12-03

ASN Intelligence API for production workflows

Use ASN data for AS51941 in automation: routing intelligence, peering analysis, ownership checks, and network observability.

Access complete peers, upstreams, downstreams, routes, WHOIS, and contact intelligence via our API. Learn more

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IP Ranges

Route	Origin	Origin Name	ISP	# IPs
2a02:2380:1::/48	AS51941	BaseN Oy	BaseN Services at HEL	~1×10²⁴
46.183.72.0/23	AS51941	BaseN Oy	BaseN IPv4 allocation	512
2a02:2380:4::/48	AS51941	BaseN Oy	BaseN USA SJC	~1×10²⁴
2a02:2380:3::/48	AS51941	BaseN Oy	BaseN Services at HEL	~1×10²⁴
46.183.74.0/23	AS51941	BaseN Oy	BaseN IPv4 allocation	512
185.128.255.0/24	AS51941	BaseN Oy	BaseN Oy	256
46.183.76.0/23	AS51941	BaseN Oy	BaseN IPv4 allocation	512
2a02:2380:2::/48	AS51941	BaseN Oy	BaseN Services at HEL	~1×10²⁴
46.183.78.0/24	AS51941	BaseN Oy	BaseN Oy	256
2a02:2380:ff00::/48	AS51941	BaseN Oy	BaseN Services at INK	~1×10²⁴

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 'AS51857 - AS52209'

as-block:       AS51857 - AS52209
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:        2024-12-12T14:34:06Z
last-modified:  2024-12-12T14:34:06Z
source:         RIPE

% Information related to 'AS51941'

% Abuse contact for 'AS51941' is 'abuse@basen.net'

aut-num:        AS51941
as-name:        BASEN-EU
org:            ORG-BC19-RIPE
import:         from AS174 accept ANY
import:         from AS2914 accept ANY
import:         from AS6667 accept ANY
export:         to AS174 announce AS51941
export:         to AS2914 announce AS51941
export:         to AS6667 announce AS51941
admin-c:        KJN-RIPE
tech-c:         KJN-RIPE
status:         ASSIGNED
mnt-by:         RIPE-NCC-END-MNT
mnt-by:         MNT-BASEN
created:        2010-12-03T08:36:08Z
last-modified:  2025-07-02T11:53:12Z
source:         RIPE # Filtered

organisation:   ORG-BC19-RIPE
org-name:       BaseN Oy
country:        FI
org-type:       LIR
address:        Salmisaarenaukio 1
address:        00180
address:        Helsinki
address:        FINLAND
phone:          +358 9 8562 6653
mnt-ref:        MNT-BASEN
mnt-ref:        RIPE-NCC-HM-MNT
mnt-by:         RIPE-NCC-HM-MNT
mnt-by:         MNT-BASEN
admin-c:        KJN-RIPE
admin-c:        PH21
abuse-c:        BNA-RIPE
created:        2008-04-11T14:15:03Z
last-modified:  2025-06-19T08:35:33Z
source:         RIPE # Filtered

person:         Kaj J. Niemi
address:        BaseN Corporation
address:        Salmisaarenaukio 1
address:        FIN-00180 Helsinki
address:        Finland
phone:          +358 9 8562 6653
nic-hdl:        KJN-RIPE
mnt-by:         MNT-BASEN
created:        2002-05-09T18:03:42Z
last-modified:  2025-06-19T08:34:06Z
source:         RIPE # Filtered

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

Parsed Whois Response

{
  "status" : true,
  "whois_server" : "whois.ripe.net",
  "as_blocks" : [ {
    "as_block" : "AS51857 - AS52209",
    "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" : "2024-12-12",
    "date_updated" : "2024-12-12",
    "source" : "RIPE"
  } ],
  "aut_nums" : [ {
    "aut_num" : "AS51941",
    "as_name" : "BASEN-EU",
    "status" : "ASSIGNED",
    "import" : [ "from AS174 accept ANY", "from AS2914 accept ANY", "from AS6667 accept ANY" ],
    "export" : [ "to AS174 announce AS51941", "to AS2914 announce AS51941", "to AS6667 announce AS51941" ],
    "organization" : "ORG-BC19-RIPE",
    "admin_contacts" : [ "KJN-RIPE" ],
    "tech_contacts" : [ "KJN-RIPE" ],
    "mnt_by" : [ "RIPE-NCC-END-MNT", "MNT-BASEN" ],
    "date_created" : "2010-12-03",
    "date_updated" : "2025-07-02",
    "source" : "RIPE"
  } ],
  "organization" : {
    "handle" : "ORG-BC19-RIPE",
    "name" : "BaseN Oy",
    "type" : "LIR",
    "address" : [ "Salmisaarenaukio 1", "00180", "Helsinki", "FINLAND" ],
    "street" : "Salmisaarenaukio",
    "city" : "Helsinki",
    "zip_code" : "00180",
    "country" : [ "FI" ],
    "phone" : [ "+358 9 8562 6653" ],
    "admin_contacts" : [ "KJN-RIPE", "PH21" ],
    "abuse_contacts" : [ "BNA-RIPE" ],
    "mnt_ref" : [ "MNT-BASEN", "RIPE-NCC-HM-MNT" ],
    "mnt_by" : [ "RIPE-NCC-HM-MNT", "MNT-BASEN" ],
    "date_created" : "2008-04-11",
    "date_updated" : "2025-06-19",
    "source" : "RIPE",
    "addressCountry" : "FINLAND"
  },
  "administrative_contacts" : [ {
    "handle" : "KJN-RIPE",
    "name" : "Kaj J. Niemi",
    "address" : [ "BaseN Corporation", "Salmisaarenaukio 1", "FIN-00180 Helsinki", "Finland" ],
    "street" : "Fin-00180",
    "city" : "Helsinki",
    "country" : "FINLAND",
    "phone" : [ "+358 9 8562 6653" ],
    "mnt_by" : [ "MNT-BASEN" ],
    "date_created" : "2002-05-09",
    "date_updated" : "2025-06-19",
    "source" : "RIPE",
    "addressCountry" : "FINLAND"
  } ],
  "technical_contacts" : [ {
    "handle" : "KJN-RIPE",
    "name" : "Kaj J. Niemi",
    "address" : [ "BaseN Corporation", "Salmisaarenaukio 1", "FIN-00180 Helsinki", "Finland" ],
    "street" : "Fin-00180",
    "city" : "Helsinki",
    "country" : "FINLAND",
    "phone" : [ "+358 9 8562 6653" ],
    "mnt_by" : [ "MNT-BASEN" ],
    "date_created" : "2002-05-09",
    "date_updated" : "2025-06-19",
    "source" : "RIPE",
    "addressCountry" : "FINLAND"
  } ]
}

Peers

AS Number	Description	Country
AS6667	Elisa Oyj	FI
AS1239	Cogent Communications, LLC	US
AS2914	NTT America, Inc.	US
AS174	Cogent Communications, LLC	US

Upstreams

AS Number	Description	Country
AS6667	Elisa Oyj	FI
AS2914	NTT America, Inc.	US
AS174	Cogent Communications, LLC	US