ASN AS15721 is an Autonomous System Number used to identify a network for BGP internet routing.

Who manages ASN AS15721?

AS15721 is listed under C.T.CO. 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.

AS15721 C.T.CO. Ltd. | IPGeolocation.io

ASN Lookup Tool

C.T.CO. Ltd. ctco.lv

LV 3 Routes

AS Data

AS15721

AS15721 – C.T.CO. Ltd.

AS Number	15721
AS Name	CTCO
Organization	C.T.CO. Ltd. (org-cl2-ripe)
Country	LV
Website	ctco.lv
Number of IPv4 Routes	3
Number of IPv6 Routes	0
ASN type	BUSINESS
Allocation Status	ASSIGNED
Registry	RIPE
Date Allocated	2001-12-13

ASN Intelligence API for production workflows

Use ASN data for AS15721 in automation: routing intelligence, peering analysis, ownership checks, and network observability.

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IP Ranges

Route	Origin	Origin Name	ISP	# IPs
217.21.168.0/21	AS15721	C.T.CO. Ltd.	C.T.Co Ltd	2048
217.21.168.0/22	AS15721	C.T.CO. Ltd.	C.T.Co Ltd	1024
217.21.172.0/22	AS15721	C.T.CO. Ltd.	C.T.Co Ltd	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 'AS15719 - AS15803'

as-block:       AS15719 - AS15803
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:        2024-02-13T15:18:50Z
last-modified:  2024-02-13T15:18:50Z
source:         RIPE

% Information related to 'AS15721'

% Abuse contact for 'AS15721' is 'sysadmin@ctco.lv'

aut-num:        AS15721
org:            ORG-CL2-RIPE
as-name:        CTCO
descr:          Riga, Latvia
import:         from AS-CTCO action pref=100; accept AS-LATVIA
import:         from AS21016 action pref=50; accept ANY
export:         to AS-CTCO announce AS15721
export:         to AS21016 action aspath.prepend (AS15721,  AS15721);  announce AS15721
import:         from AS12578 action pref=200; accept ANY
export:         to AS12578 announce AS15721
import:         from AS197870 action pref=200; accept ANY
export:         to AS197870 announce AS15721
import:         from AS9002 action pref=50; accept ANY
export:         to AS9002 action aspath.prepend (AS15721,AS15721,AS15721,AS15721,AS15721); announce AS15721
admin-c:        CH951-RIPE
tech-c:         CH951-RIPE
status:         ASSIGNED
mnt-by:         RIPE-NCC-END-MNT
mnt-by:         CTCO-MNT
created:        2001-12-13T18:16:00Z
last-modified:  2023-10-20T11:49:35Z
source:         RIPE

organisation:   ORG-CL2-RIPE
org-name:       C.T.CO. Ltd.
country:        LV
org-type:       LIR
address:        Meistaru Street 33
address:        LV-1076
address:        Valdlauchi
address:        LATVIA
phone:          +37166952000
admin-c:        JK5327-RIPE
admin-c:        PG4602-RIPE
mnt-by:         CTCO-MNT
mnt-ref:        CTCO-MNT
mnt-ref:        RIPE-NCC-HM-MNT
mnt-by:         RIPE-NCC-HM-MNT
abuse-c:        CAC84-RIPE
created:        2004-04-17T11:37:59Z
last-modified:  2020-12-16T13:29:43Z
source:         RIPE # Filtered

role:           CTCO Hostmaster
address:        Meistaru Street 33
address:        Valdlauchi, LV-1076, Latvia
phone:          +37166952059
admin-c:        PG4602-RIPE
tech-c:         AS6824-RIPE
tech-c:         KR559-RIPE
nic-hdl:        CH951-RIPE
mnt-by:         CTCO-MNT
created:        2003-04-10T15:06:48Z
last-modified:  2024-01-04T12:31:08Z
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" : "AS15719 - AS15803",
    "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" : "2024-02-13",
    "date_updated" : "2024-02-13",
    "source" : "RIPE"
  } ],
  "aut_nums" : [ {
    "aut_num" : "AS15721",
    "as_name" : "CTCO",
    "description" : [ "Riga, Latvia" ],
    "status" : "ASSIGNED",
    "import" : [ "from AS-CTCO action pref=100; accept AS-LATVIA", "from AS21016 action pref=50; accept ANY", "from AS12578 action pref=200; accept ANY", "from AS197870 action pref=200; accept ANY", "from AS9002 action pref=50; accept ANY" ],
    "export" : [ "to AS-CTCO announce AS15721", "to AS21016 action aspath.prepend (AS15721,  AS15721);  announce AS15721", "to AS12578 announce AS15721", "to AS197870 announce AS15721", "to AS9002 action aspath.prepend (AS15721,AS15721,AS15721,AS15721,AS15721); announce AS15721" ],
    "organization" : "ORG-CL2-RIPE",
    "admin_contacts" : [ "CH951-RIPE" ],
    "tech_contacts" : [ "CH951-RIPE" ],
    "mnt_by" : [ "RIPE-NCC-END-MNT", "CTCO-MNT" ],
    "date_created" : "2001-12-13",
    "date_updated" : "2023-10-20",
    "source" : "RIPE"
  } ],
  "organization" : {
    "handle" : "ORG-CL2-RIPE",
    "name" : "C.T.CO. Ltd.",
    "type" : "LIR",
    "address" : [ "Meistaru Street 33", "LV-1076", "Valdlauchi", "LATVIA" ],
    "street" : "Meistaru Street",
    "city" : "Valdlauchi",
    "zip_code" : "LV-1076",
    "country" : [ "LV" ],
    "phone" : [ "+37166952000" ],
    "admin_contacts" : [ "JK5327-RIPE", "PG4602-RIPE" ],
    "abuse_contacts" : [ "CAC84-RIPE" ],
    "mnt_ref" : [ "CTCO-MNT", "RIPE-NCC-HM-MNT" ],
    "mnt_by" : [ "CTCO-MNT", "RIPE-NCC-HM-MNT" ],
    "date_created" : "2004-04-17",
    "date_updated" : "2020-12-16",
    "source" : "RIPE",
    "addressCountry" : "LATVIA"
  },
  "administrative_contacts" : [ {
    "handle" : "CH951-RIPE",
    "name" : "CTCO Hostmaster",
    "address" : [ "Meistaru Street 33", "Valdlauchi, LV-1076, Latvia" ],
    "street" : "Meistaru Street 33",
    "city" : "Valdlauchi",
    "zip_code" : "LV-1076",
    "country" : "LATVIA",
    "phone" : [ "+37166952059" ],
    "admin_contacts" : [ "PG4602-RIPE" ],
    "tech_contacts" : [ "AS6824-RIPE", "KR559-RIPE" ],
    "mnt_by" : [ "CTCO-MNT" ],
    "date_created" : "2003-04-10",
    "date_updated" : "2024-01-04",
    "source" : "RIPE",
    "addressCountry" : "LATVIA"
  } ],
  "technical_contacts" : [ {
    "handle" : "CH951-RIPE",
    "name" : "CTCO Hostmaster",
    "address" : [ "Meistaru Street 33", "Valdlauchi, LV-1076, Latvia" ],
    "street" : "Meistaru Street 33",
    "city" : "Valdlauchi",
    "zip_code" : "LV-1076",
    "country" : "LATVIA",
    "phone" : [ "+37166952059" ],
    "admin_contacts" : [ "PG4602-RIPE" ],
    "tech_contacts" : [ "AS6824-RIPE", "KR559-RIPE" ],
    "mnt_by" : [ "CTCO-MNT" ],
    "date_created" : "2003-04-10",
    "date_updated" : "2024-01-04",
    "source" : "RIPE",
    "addressCountry" : "LATVIA"
  } ]
}

Peers

AS Number	Description	Country
AS197870	S.I.A."IBANPAY"	LV
AS21016	SIA BITE Latvija	LV
AS197870	S.I.A.IBANPAY	LV
AS28886	RETN Limited	GB
AS9002	RETN Limited	GB
AS12578	SIA Tet	LV

Upstreams

AS Number	Description	Country
AS197870	S.I.A.IBANPAY	LV
AS28886	RETN Limited	GB
AS9002	RETN Limited	GB
AS12578	SIA Tet	LV

Downstreams

AS Number	Description	Country
AS197870	S.I.A.IBANPAY	LV