What is ASN AS133405?

ASN AS133405 is an Autonomous System Number used to identify a network for BGP internet routing.

Who manages ASN AS133405?

AS133405 is listed under RETN 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?

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AS133405 RETN Co., Ltd. | IPGeolocation.io

RETN Co., Ltd. retn.net

JP 2 Routes

AS Data

AS133405

AS133405 – RETN Co., Ltd.

AS Number	133405
AS Name	RETNKK-AS-AP
Organization	RETN Co., Ltd. (org-rkk1-ap)
Country	JP
Website	retn.net
Number of IPv4 Routes	1
Number of IPv6 Routes	1
ASN type	ISP
Registry	APNIC
Date Allocated	N/A

ASN Intelligence API for production workflows

Use ASN data for AS133405 in automation: routing intelligence, peering analysis, ownership checks, and network observability.

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IP Ranges

Route	Origin	Origin Name	ISP	# IPs
163.128.219.0/24	AS133405	RETN Co., Ltd.	RETN Co., Ltd.	256
2001:df6:edc0::/48	AS133405	RETN Co., Ltd.	RETN Co., Ltd.	~1×10²⁴

Raw Whois Response

% [whois.apnic.net]
% Whois data copyright terms    http://www.apnic.net/db/dbcopyright.html

% Information related to 'AS133120 - AS133631'

as-block:       AS133120 - AS133631
descr:          APNIC ASN block
remarks:        These AS numbers are further assigned by APNIC
remarks:        to APNIC members and end-users in the APNIC region
admin-c:        HM20-AP
tech-c:         HM20-AP
mnt-by:         APNIC-HM
mnt-lower:      APNIC-HM
last-modified:  2013-09-11T23:52:15Z
source:         APNIC

role:           APNIC Hostmaster
address:        6 Cordelia Street
address:        South Brisbane
address:        QLD 4101
country:        AU
phone:          +61 7 3858 3100
fax-no:         +61 7 3858 3199
e-mail:         helpdesk@apnic.net
admin-c:        AMS11-AP
tech-c:         AH256-AP
nic-hdl:        HM20-AP
remarks:        Administrator for APNIC
notify:         hostmaster@apnic.net
mnt-by:         MAINT-APNIC-AP
last-modified:  2013-10-23T04:06:51Z
source:         APNIC

% Information related to 'AS133405'

% Abuse contact for 'AS133405' is 'abuse@retn.net'

aut-num:        AS133405
as-name:        RETNKK-AS-AP
descr:          RETN Co., Ltd.
country:        JP
org:            ORG-RKK1-AP
admin-c:        RKKA1-AP
tech-c:         RKKA1-AP
mnt-by:         APNIC-HM
mnt-irt:        IRT-RETNKK-JP
mnt-routes:     MAINT-RETNKK-JP
mnt-lower:      MAINT-RETNKK-JP
abuse-c:        AR1534-AP
last-modified:  2026-04-14T09:15:43Z
source:         APNIC

irt:            IRT-RETNKK-JP
address:        6-2-31-1917 Toyosu, Koto-ku, Tokyo, 135-0061, Japan, Tokyo Koto-ku 135-0061
e-mail:         peering@retn.net
abuse-mailbox:  abuse@retn.net
admin-c:        RKKA1-AP
tech-c:         RKKA1-AP
auth:           # Filtered
remarks:        abuse@retn.net was validated on 2026-02-17
mnt-by:         MAINT-RETNKK-JP
last-modified:  2026-04-14T09:31:23Z
source:         APNIC

organisation:   ORG-RKK1-AP
org-name:       RETN Co., Ltd.
org-type:       LIR
country:        JP
address:        6-2-31-1917 Toyosu
address:        Koto-ku, Tokyo, 135-0061, Japan
phone:          +85238454700
e-mail:         peering@retn.net
mnt-ref:        APNIC-HM
mnt-by:         APNIC-HM
last-modified:  2026-03-13T13:24:44Z
source:         APNIC

role:           ABUSE RETNKKJP
country:        ZZ
address:        6-2-31-1917 Toyosu, Koto-ku, Tokyo, 135-0061, Japan, Tokyo Koto-ku 135-0061
phone:          +000000000
e-mail:         peering@retn.net
admin-c:        RKKA1-AP
tech-c:         RKKA1-AP
nic-hdl:        AR1534-AP
remarks:        Generated from irt object IRT-RETNKK-JP
remarks:        abuse@retn.net was validated on 2026-02-17
abuse-mailbox:  abuse@retn.net
mnt-by:         APNIC-ABUSE
last-modified:  2026-04-14T01:45:16Z
source:         APNIC

role:           RETN K K administrator
address:        6-2-31-1917 Toyosu, Koto-ku, Tokyo, 135-0061, Japan, Tokyo Koto-ku 135-0061
country:        JP
phone:          +85238454700
e-mail:         peering@retn.net
admin-c:        RKKA1-AP
tech-c:         RKKA1-AP
nic-hdl:        RKKA1-AP
mnt-by:         MAINT-RETNKK-JP
last-modified:  2026-04-13T01:47:49Z
source:         APNIC

% This query was served by the APNIC Whois Service version 1.88.48 (WHOIS-US2)



#
# ARIN WHOIS data and services are subject to the Terms of Use
# available at: https://www.arin.net/resources/registry/whois/tou/
#
# If you see inaccuracies in the results, please report at
# https://www.arin.net/resources/registry/whois/inaccuracy_reporting/
#
# Copyright 1997-2026, American Registry for Internet Numbers, Ltd.
#


ASNumber:       132575 - 138453
ASName:         APNIC-ASBLOCK-132575
ASHandle:       AS132575
RegDate:        2006-11-29
Updated:        2024-09-03
Comment:        These AS numbers are not registered in the ARIN database.
Comment:        For details, refer to the APNIC Whois Database via
Comment:        WHOIS.APNIC.NET or http://wq.apnic.net/apnic-bin/whois.pl
Ref:            https://rdap.arin.net/registry/autnum/132575

ResourceLink:  https://apps.db.ripe.net/db-web-ui/query
ResourceLink:  whois.apnic.net


OrgName:        Asia Pacific Network Information Centre
OrgId:          APNIC
Address:        PO Box 3646
City:           South Brisbane
StateProv:      QLD
PostalCode:     4101
Country:        AU
RegDate:        
Updated:        2012-01-24
Ref:            https://rdap.arin.net/registry/entity/APNIC

ReferralServer:  whois://whois.apnic.net
ResourceLink:  http://wq.apnic.net/whois-search/static/search.html

OrgTechHandle: AWC12-ARIN
OrgTechName:   APNIC Whois Contact
OrgTechPhone:  +61 7 3858 3188 
OrgTechEmail:  search-apnic-not-arin@apnic.net
OrgTechRef:    https://rdap.arin.net/registry/entity/AWC12-ARIN

OrgAbuseHandle: AWC12-ARIN
OrgAbuseName:   APNIC Whois Contact
OrgAbusePhone:  +61 7 3858 3188 
OrgAbuseEmail:  search-apnic-not-arin@apnic.net
OrgAbuseRef:    https://rdap.arin.net/registry/entity/AWC12-ARIN


#
# ARIN WHOIS data and services are subject to the Terms of Use
# available at: https://www.arin.net/resources/registry/whois/tou/
#
# If you see inaccuracies in the results, please report at
# https://www.arin.net/resources/registry/whois/inaccuracy_reporting/
#
# Copyright 1997-2026, American Registry for Internet Numbers, Ltd.
#

[ JPNIC database provides information regarding IP address and ASN. Its use   ]
[ is restricted to network administration purposes. For further information,  ]
[ use 'whois -h whois.nic.ad.jp help'. To only display English output,        ]
[ add '/e' at the end of command, e.g. 'whois -h whois.nic.ad.jp xxx/e'.      ]

No match!!

Reference: WHOIS servers of RIRs
  APNIC WHOIS(whois.apnic.net)
  ARIN WHOIS(whois.arin.net)
  RIPE WHOIS(apps.db.ripe.net)
  LACNIC WHOIS(whois.lacnic.net)
  AfriNIC WHOIS(whois.afrinic.net)
% [whois.apnic.net]
% Whois data copyright terms    http://www.apnic.net/db/dbcopyright.html

% Information related to 'AS133120 - AS133631'

as-block:       AS133120 - AS133631
descr:          APNIC ASN block
remarks:        These AS numbers are further assigned by APNIC
remarks:        to APNIC members and end-users in the APNIC region
admin-c:        HM20-AP
tech-c:         HM20-AP
mnt-by:         APNIC-HM
mnt-lower:      APNIC-HM
last-modified:  2013-09-11T23:52:15Z
source:         APNIC

role:           APNIC Hostmaster
address:        6 Cordelia Street
address:        South Brisbane
address:        QLD 4101
country:        AU
phone:          +61 7 3858 3100
fax-no:         +61 7 3858 3199
e-mail:         helpdesk@apnic.net
admin-c:        AMS11-AP
tech-c:         AH256-AP
nic-hdl:        HM20-AP
remarks:        Administrator for APNIC
notify:         hostmaster@apnic.net
mnt-by:         MAINT-APNIC-AP
last-modified:  2013-10-23T04:06:51Z
source:         APNIC

% Information related to 'AS133405'

% Abuse contact for 'AS133405' is 'abuse@retn.net'

aut-num:        AS133405
as-name:        RETNKK-AS-AP
descr:          RETN Co., Ltd.
country:        JP
org:            ORG-RKK1-AP
admin-c:        RKKA1-AP
tech-c:         RKKA1-AP
mnt-by:         APNIC-HM
mnt-irt:        IRT-RETNKK-JP
mnt-routes:     MAINT-RETNKK-JP
mnt-lower:      MAINT-RETNKK-JP
abuse-c:        AR1534-AP
last-modified:  2026-04-14T09:15:43Z
source:         APNIC

irt:            IRT-RETNKK-JP
address:        6-2-31-1917 Toyosu, Koto-ku, Tokyo, 135-0061, Japan, Tokyo Koto-ku 135-0061
e-mail:         peering@retn.net
abuse-mailbox:  abuse@retn.net
admin-c:        RKKA1-AP
tech-c:         RKKA1-AP
auth:           # Filtered
remarks:        abuse@retn.net was validated on 2026-02-17
mnt-by:         MAINT-RETNKK-JP
last-modified:  2026-04-14T09:31:23Z
source:         APNIC

organisation:   ORG-RKK1-AP
org-name:       RETN Co., Ltd.
org-type:       LIR
country:        JP
address:        6-2-31-1917 Toyosu
address:        Koto-ku, Tokyo, 135-0061, Japan
phone:          +85238454700
e-mail:         peering@retn.net
mnt-ref:        APNIC-HM
mnt-by:         APNIC-HM
last-modified:  2026-03-13T13:24:44Z
source:         APNIC

role:           ABUSE RETNKKJP
country:        ZZ
address:        6-2-31-1917 Toyosu, Koto-ku, Tokyo, 135-0061, Japan, Tokyo Koto-ku 135-0061
phone:          +000000000
e-mail:         peering@retn.net
admin-c:        RKKA1-AP
tech-c:         RKKA1-AP
nic-hdl:        AR1534-AP
remarks:        Generated from irt object IRT-RETNKK-JP
remarks:        abuse@retn.net was validated on 2026-02-17
abuse-mailbox:  abuse@retn.net
mnt-by:         APNIC-ABUSE
last-modified:  2026-04-14T01:45:16Z
source:         APNIC

role:           RETN K K administrator
address:        6-2-31-1917 Toyosu, Koto-ku, Tokyo, 135-0061, Japan, Tokyo Koto-ku 135-0061
country:        JP
phone:          +85238454700
e-mail:         peering@retn.net
admin-c:        RKKA1-AP
tech-c:         RKKA1-AP
nic-hdl:        RKKA1-AP
mnt-by:         MAINT-RETNKK-JP
last-modified:  2026-04-13T01:47:49Z
source:         APNIC

% This query was served by the APNIC Whois Service version 1.88.48 (WHOIS-JP1)

Parsed Whois Response

{
  "status" : true,
  "whois_server" : "whois.apnic.net",
  "as_blocks" : [ {
    "as_block" : "AS133120 - AS133631",
    "description" : [ "APNIC ASN block" ],
    "admin_contacts" : [ "HM20-AP" ],
    "tech_contacts" : [ "HM20-AP" ],
    "remarks" : [ "These AS numbers are further assigned by APNIC", "to APNIC members and end-users in the APNIC region" ],
    "mnt_by" : [ "APNIC-HM" ],
    "mnt_lower" : [ "APNIC-HM" ],
    "date_updated" : "2013-09-11",
    "source" : "APNIC"
  }, {
    "as_block" : "AS133120 - AS133631",
    "description" : [ "APNIC ASN block" ],
    "admin_contacts" : [ "HM20-AP" ],
    "tech_contacts" : [ "HM20-AP" ],
    "remarks" : [ "These AS numbers are further assigned by APNIC", "to APNIC members and end-users in the APNIC region" ],
    "mnt_by" : [ "APNIC-HM" ],
    "mnt_lower" : [ "APNIC-HM" ],
    "date_updated" : "2013-09-11",
    "source" : "APNIC"
  } ],
  "aut_nums" : [ {
    "aut_num" : "AS133405",
    "as_name" : "RETNKK-AS-AP",
    "description" : [ "RETN Co., Ltd." ],
    "country" : "JP",
    "organization" : "ORG-RKK1-AP",
    "admin_contacts" : [ "RKKA1-AP" ],
    "tech_contacts" : [ "RKKA1-AP" ],
    "abuse_contacts" : [ "AR1534-AP" ],
    "mnt_irt" : [ "IRT-RETNKK-JP" ],
    "mnt_lower" : [ "MAINT-RETNKK-JP" ],
    "mnt_routes" : [ "MAINT-RETNKK-JP" ],
    "mnt_by" : [ "APNIC-HM" ],
    "date_updated" : "2026-04-14",
    "source" : "APNIC"
  }, {
    "aut_num" : "AS133405",
    "as_name" : "RETNKK-AS-AP",
    "description" : [ "RETN Co., Ltd." ],
    "country" : "JP",
    "organization" : "ORG-RKK1-AP",
    "admin_contacts" : [ "RKKA1-AP" ],
    "tech_contacts" : [ "RKKA1-AP" ],
    "abuse_contacts" : [ "AR1534-AP" ],
    "mnt_irt" : [ "IRT-RETNKK-JP" ],
    "mnt_lower" : [ "MAINT-RETNKK-JP" ],
    "mnt_routes" : [ "MAINT-RETNKK-JP" ],
    "mnt_by" : [ "APNIC-HM" ],
    "date_updated" : "2026-04-14",
    "source" : "APNIC"
  } ],
  "irt" : {
    "handle" : "IRT-RETNKK-JP",
    "address" : [ "6-2-31-1917 Toyosu, Koto-ku, Tokyo, 135-0061, Japan, Tokyo Koto-ku 135-0061" ],
    "city" : "Koto-ku",
    "state" : "TOKYO",
    "zip_code" : "135-0061",
    "country" : "JAPAN",
    "email" : [ "peering@retn.net" ],
    "abuse_mailbox" : [ "abuse@retn.net" ],
    "admin_contacts" : [ "RKKA1-AP" ],
    "tech_contacts" : [ "RKKA1-AP" ],
    "remarks" : [ "abuse@retn.net was validated on 2026-02-17" ],
    "mnt_by" : [ "MAINT-RETNKK-JP" ],
    "date_updated" : "2026-04-14",
    "source" : "APNIC"
  },
  "organization" : {
    "handle" : "ORG-RKK1-AP",
    "name" : "RETN Co., Ltd.",
    "type" : "LIR",
    "address" : [ "6-2-31-1917 Toyosu", "Koto-ku, Tokyo, 135-0061, Japan" ],
    "city" : "Tokyo",
    "zip_code" : "135-0061",
    "country" : [ "JP" ],
    "email" : [ "peering@retn.net" ],
    "phone" : [ "+85238454700" ],
    "mnt_ref" : [ "APNIC-HM" ],
    "mnt_by" : [ "APNIC-HM" ],
    "date_updated" : "2026-03-13",
    "source" : "APNIC",
    "addressCountry" : "JAPAN"
  },
  "administrative_contacts" : [ {
    "handle" : "RKKA1-AP",
    "name" : "RETN K K administrator",
    "address" : [ "6-2-31-1917 Toyosu, Koto-ku, Tokyo, 135-0061, Japan, Tokyo Koto-ku 135-0061" ],
    "city" : "Koto-ku",
    "state" : "TOKYO",
    "zip_code" : "135-0061",
    "country" : "JP",
    "email" : [ "peering@retn.net" ],
    "phone" : [ "+85238454700" ],
    "admin_contacts" : [ "RKKA1-AP" ],
    "tech_contacts" : [ "RKKA1-AP" ],
    "mnt_by" : [ "MAINT-RETNKK-JP" ],
    "date_updated" : "2026-04-13",
    "source" : "APNIC",
    "addressCountry" : "JAPAN"
  } ],
  "technical_contacts" : [ {
    "handle" : "RKKA1-AP",
    "name" : "RETN K K administrator",
    "address" : [ "6-2-31-1917 Toyosu, Koto-ku, Tokyo, 135-0061, Japan, Tokyo Koto-ku 135-0061" ],
    "city" : "Koto-ku",
    "state" : "TOKYO",
    "zip_code" : "135-0061",
    "country" : "JP",
    "email" : [ "peering@retn.net" ],
    "phone" : [ "+85238454700" ],
    "admin_contacts" : [ "RKKA1-AP" ],
    "tech_contacts" : [ "RKKA1-AP" ],
    "mnt_by" : [ "MAINT-RETNKK-JP" ],
    "date_updated" : "2026-04-13",
    "source" : "APNIC",
    "addressCountry" : "JAPAN"
  } ],
  "abuse_contacts" : [ {
    "handle" : "AR1534-AP",
    "name" : "ABUSE RETNKKJP",
    "address" : [ "6-2-31-1917 Toyosu, Koto-ku, Tokyo, 135-0061, Japan, Tokyo Koto-ku 135-0061" ],
    "city" : "Koto-ku",
    "state" : "TOKYO",
    "zip_code" : "135-0061",
    "country" : "ZZ",
    "email" : [ "peering@retn.net" ],
    "abuse_mailbox" : [ "abuse@retn.net" ],
    "phone" : [ "+000000000" ],
    "admin_contacts" : [ "RKKA1-AP" ],
    "tech_contacts" : [ "RKKA1-AP" ],
    "remarks" : [ "Generated from irt object IRT-RETNKK-JP", "abuse@retn.net was validated on 2026-02-17" ],
    "mnt_by" : [ "APNIC-ABUSE" ],
    "date_updated" : "2026-04-14",
    "source" : "APNIC",
    "addressCountry" : "JAPAN"
  } ]
}

Peers

AS Number	Description	Country
AS9002	RETN Limited	GB

Upstreams

AS Number	Description	Country
AS9002	RETN Limited	GB

Contacts

Email Contacts

peering@retn.net

Abuse Contacts

abuse@retn.net

ASN Lookup Tool

ASN Summary