ASN AS10209 is an Autonomous System Number used to identify a network for BGP internet routing.

Who manages ASN AS10209?

AS10209 is listed under Synopsys.

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.

AS10209 Synopsys | IPGeolocation.io

ASN Lookup Tool

Synopsys

JP 3 Routes

AS Data

AS10209

AS10209 – Synopsys

AS Number	10209
AS Name	Japan HUB and Data Center
Organization	Synopsys (org-sa28-ap)
Country	JP
Number of IPv4 Routes	3
Number of IPv6 Routes	0
ASN type	BUSINESS
Registry	APNIC
Date Allocated	2007-09-25

ASN Intelligence API for production workflows

Use ASN data for AS10209 in automation: routing intelligence, peering analysis, ownership checks, and network observability.

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IP Ranges

Route	Origin	Origin Name	ISP	# IPs
198.182.50.0/23	AS10209	Synopsys	Synopsys Inc.	512
198.182.50.0/24	AS10209	Synopsys	Synopsys Inc.	256
198.182.51.0/24	AS10209	Synopsys	Synopsys Inc.	256

Raw Whois Response

[ 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 'AS9249 - AS10239'

as-block:       AS9249 - AS10239
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:  2022-09-22T22:36:45Z
source:         APNIC

role:           APNIC Hostmaster
address:        PO Box 3646
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:  2026-08-26T00:40:00Z
source:         APNIC

% Information related to 'AS10209'

% Abuse contact for 'AS10209' is 'bent@synopsys.com'

aut-num:        AS10209
as-name:        Synopsys-AS-JP-AP
descr:          Japan HUB and Data Center
descr:          1-28-1 Ooi, Shinagawa-ku Sumitomo Fudosan Ooimachi Ekimae Bl Tokyo
country:        JP
import:         from AS1 action pref=100; accept ANY
import:         from AS1239 action pref=100; accept ANY
export:         to AS1 announce AS10209
export:         to AS1239 announce AS10209
default:        to AS1 action pref=10; networks ANY
remarks:        www.synopsys.com
org:            ORG-SA28-AP
admin-c:        BT217-AP
tech-c:         BT217-AP
abuse-c:        AS2372-AP
notify:         network@synopsys.com
mnt-lower:      MAINT-JP-SYNOPSYS
mnt-routes:     MAINT-JP-SYNOPSYS
mnt-by:         APNIC-HM
mnt-irt:        IRT-SYNOPSYS-NON-JP
last-modified:  2020-06-22T15:54:35Z
source:         APNIC

irt:            IRT-SYNOPSYS-NON-JP
address:        700 E. Middlefield Road
address:        Mountain View, CA 94043
e-mail:         bent@synopsys.com
abuse-mailbox:  bent@synopsys.com
admin-c:        BT217-AP
tech-c:         BT217-AP
auth:           # Filtered
remarks:        bent@synopsys.com was validated on 2026-08-11
mnt-by:         MAINT-JP-SYNOPSYS
last-modified:  2026-08-11T15:01:47Z
source:         APNIC

organisation:   ORG-SA28-AP
org-name:       Synopsys
org-type:       LIR
country:        JP
address:        Futako Tamagawa Rise Office
address:        2-21-1 Tamagawa, Setagaya-ku
phone:          +1-650-584-5000
e-mail:         network-core@synopsys.com
mnt-ref:        APNIC-HM
mnt-by:         APNIC-HM
last-modified:  2023-09-05T02:14:55Z
source:         APNIC

role:           ABUSE SYNOPSYSNONJP
country:        ZZ
address:        700 E. Middlefield Road
address:        Mountain View, CA 94043
phone:          +000000000
e-mail:         bent@synopsys.com
admin-c:        BT217-AP
tech-c:         BT217-AP
nic-hdl:        AS2372-AP
remarks:        Generated from irt object IRT-SYNOPSYS-NON-JP
remarks:        bent@synopsys.com was validated on 2026-08-11
abuse-mailbox:  bent@synopsys.com
mnt-by:         APNIC-ABUSE
last-modified:  2026-08-11T15:01:54Z
source:         APNIC

person:         BEN TSUI
nic-hdl:        BT217-AP
e-mail:         BENT@SYNOPSYS.COM
address:        700 E. Middlefield Road
address:        Mountain View, CA 94043
phone:          +1-650-584-4260
fax-no:         +1-650-584-4343
country:        US
mnt-by:         MAINT-NEW
last-modified:  2008-09-04T07:49:55Z
source:         APNIC

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

Parsed Whois Response

{
  "status" : true,
  "whois_server" : "whois.apnic.net",
  "as_blocks" : [ {
    "as_block" : "AS9249 - AS10239",
    "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" : "2022-09-22",
    "source" : "APNIC"
  } ],
  "aut_nums" : [ {
    "aut_num" : "AS10209",
    "as_name" : "Synopsys-AS-JP-AP",
    "description" : [ "Japan HUB and Data Center", "1-28-1 Ooi, Shinagawa-ku Sumitomo Fudosan Ooimachi Ekimae Bl Tokyo" ],
    "country" : "JP",
    "import" : [ "from AS1 action pref=100; accept ANY", "from AS1239 action pref=100; accept ANY" ],
    "export" : [ "to AS1 announce AS10209", "to AS1239 announce AS10209" ],
    "default" : [ "to AS1 action pref=10; networks ANY" ],
    "organization" : "ORG-SA28-AP",
    "admin_contacts" : [ "BT217-AP" ],
    "tech_contacts" : [ "BT217-AP" ],
    "abuse_contacts" : [ "AS2372-AP" ],
    "remarks" : [ "www.synopsys.com" ],
    "notify" : [ "network@synopsys.com" ],
    "mnt_irt" : [ "IRT-SYNOPSYS-NON-JP" ],
    "mnt_lower" : [ "MAINT-JP-SYNOPSYS" ],
    "mnt_routes" : [ "MAINT-JP-SYNOPSYS" ],
    "mnt_by" : [ "APNIC-HM" ],
    "date_updated" : "2020-06-22",
    "source" : "APNIC"
  } ],
  "irt" : {
    "handle" : "IRT-SYNOPSYS-NON-JP",
    "address" : [ "700 E. Middlefield Road", "Mountain View, CA 94043" ],
    "street" : "E. Middlefield Road",
    "city" : "Mountain View",
    "state" : "CA",
    "zip_code" : "94043",
    "email" : [ "bent@synopsys.com" ],
    "abuse_mailbox" : [ "bent@synopsys.com" ],
    "admin_contacts" : [ "BT217-AP" ],
    "tech_contacts" : [ "BT217-AP" ],
    "remarks" : [ "bent@synopsys.com was validated on 2026-08-11" ],
    "mnt_by" : [ "MAINT-JP-SYNOPSYS" ],
    "date_updated" : "2026-08-11",
    "source" : "APNIC"
  },
  "organization" : {
    "handle" : "ORG-SA28-AP",
    "name" : "Synopsys",
    "type" : "LIR",
    "address" : [ "Futako Tamagawa Rise Office", "2-21-1 Tamagawa, Setagaya-ku" ],
    "street" : "Tamagawa",
    "city" : "Setagaya-ku",
    "country" : [ "JP" ],
    "email" : [ "network-core@synopsys.com" ],
    "phone" : [ "+1-650-584-5000" ],
    "mnt_ref" : [ "APNIC-HM" ],
    "mnt_by" : [ "APNIC-HM" ],
    "date_updated" : "2023-09-05",
    "source" : "APNIC"
  },
  "administrative_contacts" : [ {
    "handle" : "BT217-AP",
    "name" : "BEN TSUI",
    "address" : [ "700 E. Middlefield Road", "Mountain View, CA 94043" ],
    "street" : "E. Middlefield Road",
    "city" : "Mountain View",
    "state" : "CA",
    "zip_code" : "94043",
    "country" : "US",
    "email" : [ "BENT@SYNOPSYS.COM" ],
    "phone" : [ "+1-650-584-4260" ],
    "fax_no" : [ "+1-650-584-4343" ],
    "mnt_by" : [ "MAINT-NEW" ],
    "date_updated" : "2008-09-04",
    "source" : "APNIC"
  } ],
  "technical_contacts" : [ {
    "handle" : "BT217-AP",
    "name" : "BEN TSUI",
    "address" : [ "700 E. Middlefield Road", "Mountain View, CA 94043" ],
    "street" : "E. Middlefield Road",
    "city" : "Mountain View",
    "state" : "CA",
    "zip_code" : "94043",
    "country" : "US",
    "email" : [ "BENT@SYNOPSYS.COM" ],
    "phone" : [ "+1-650-584-4260" ],
    "fax_no" : [ "+1-650-584-4343" ],
    "mnt_by" : [ "MAINT-NEW" ],
    "date_updated" : "2008-09-04",
    "source" : "APNIC"
  } ],
  "abuse_contacts" : [ {
    "handle" : "AS2372-AP",
    "name" : "ABUSE SYNOPSYSNONJP",
    "address" : [ "700 E. Middlefield Road", "Mountain View, CA 94043" ],
    "street" : "E. Middlefield Road",
    "city" : "Mountain View",
    "state" : "CA",
    "zip_code" : "94043",
    "country" : "ZZ",
    "email" : [ "bent@synopsys.com" ],
    "abuse_mailbox" : [ "bent@synopsys.com" ],
    "phone" : [ "+000000000" ],
    "admin_contacts" : [ "BT217-AP" ],
    "tech_contacts" : [ "BT217-AP" ],
    "remarks" : [ "Generated from irt object IRT-SYNOPSYS-NON-JP", "bent@synopsys.com was validated on 2026-08-11" ],
    "mnt_by" : [ "APNIC-ABUSE" ],
    "date_updated" : "2026-08-11",
    "source" : "APNIC"
  } ]
}

Peers

AS Number	Description	Country
AS1	Level 3 Parent, LLC	US
AS1239	Cogent Communications, LLC	US
AS4637	Telstra International Limited	HK
AS3356	Level 3 Parent, LLC	US

Upstreams

AS Number	Description	Country
AS4637	Telstra International Limited	HK
AS3356	Level 3 Parent, LLC	US

Legacy Routes

149.117.1.0/24