203.21.42.0/23

AS56118 · OCSC-TH

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Summary

Country	Thailand
Domain	ocsc.go.th
ASN	AS56118
Registry	APNIC
ID	OCSC-TH

WHOIS Details

inetnum:        203.21.42.0 - 203.21.43.255
netname:        OCSC-TH
descr:          47/111 Tiwanon Road
descr:          Talad kwan sub-district, Muang district
descr:          Nonthaburi, 11000, Thailand
country:        TH
org:            ORG-OOTC3-AP
admin-c:        WM1241-AP
tech-c:         WM1241-AP
abuse-c:        AO410-AP
status:         ASSIGNED PORTABLE
remarks:        --------------------------------------------------------
remarks:        To report network abuse, please contact mnt-irt
remarks:        For troubleshooting, please contact tech-c and admin-c
remarks:        Report invalid contact via www.apnic.net/invalidcontact
remarks:        --------------------------------------------------------
mnt-by:         APNIC-HM
mnt-routes:     MAINT-OCSC-TH
mnt-irt:        IRT-OCSC-TH
last-modified:  2023-01-30T03:09:47Z
source:         APNIC

irt:            IRT-OCSC-TH
address:        47/111 Tiwanon Road, Talad kwan sub-district, Muang district, Nonthaburi, 11000, Thailand.
e-mail:         watanyu@ocsc.go.th
abuse-mailbox:  watanyu@ocsc.go.th
admin-c:        WM1241-AP
tech-c:         WM1241-AP
auth:           # Filtered
remarks:        watanyu@ocsc.go.th was validated on 2025-10-15
mnt-by:         MAINT-OCSC-TH
last-modified:  2025-10-15T00:47:50Z
source:         APNIC

organisation:   ORG-OOTC3-AP
org-name:       Office of the Civil Service Commission (OCSC)
org-type:       LIR
country:        TH
address:        Office of the Civil Service Commission
address:        47/111 Tiwanon Road, Talad kwan sub-district,
address:        Muang district
phone:          +66-2-547-1194
fax-no:         +66-2547-1081
e-mail:         watanyu@ocsc.go.th
mnt-ref:        APNIC-HM
mnt-by:         APNIC-HM
last-modified:  2023-09-05T02:15:47Z
source:         APNIC

role:           ABUSE OCSCTH
country:        ZZ
address:        47/111 Tiwanon Road, Talad kwan sub-district, Muang district, Nonthaburi, 11000, Thailand.
phone:          +000000000
e-mail:         watanyu@ocsc.go.th
admin-c:        WM1241-AP
tech-c:         WM1241-AP
nic-hdl:        AO410-AP
remarks:        Generated from irt object IRT-OCSC-TH
remarks:        watanyu@ocsc.go.th was validated on 2025-10-15
abuse-mailbox:  watanyu@ocsc.go.th
mnt-by:         APNIC-ABUSE
last-modified:  2025-10-15T00:48:22Z
source:         APNIC

person:         Watanyu Manataursiri
address:        47/111 Tiwanon Road, Talad kwan sub-district, Muang district, Nonthaburi, 11000, Thailand.
country:        TH
phone:          +66634-1-66634
e-mail:         watanyu@ocsc.go.th
nic-hdl:        WM1241-AP
mnt-by:         MAINT-OCSC-TH
last-modified:  2022-06-14T08:32:51Z
source:         APNIC

Nearby Ranges

BGP prefixes that overlap with 203.21.0.0/16

Range	ASN	Company	Num of IPs
203.21.24.0/21	AS703	Verizon Australia PTY Limited	2,048
203.21.112.0/21	AS133612	VODAFONE AUSTRALIA PTY LIMITED	2,048
203.21.108.0/22	AS133612	VODAFONE AUSTRALIA PTY LIMITED	1,024
203.21.140.0/22	AS135409	Kacific Broadband Satellites Pte Ltd	1,024
203.21.130.0/23	AS10148	The University of Melbourne	512
203.21.128.0/23	AS7545	St. Vincent's Health & Aged Care Ltd.	512
203.21.76.0/23	AS38549	Viewbank Rise Networks	512
203.21.150.0/23	AS137896	Hunter Water Corporation	512
203.21.66.0/24	AS209854	Cyberzone S.A.	256
203.21.4.0/24	AS216053	Data Cloud Technology d.o.o Kragujevac	256
203.21.7.0/24	AS24448	Synamedia Technologies (India) Private Limited	256
203.21.79.0/24	AS2764	First Linear	256
203.21.72.0/24	AS395793	Mistic Internet Security Pty Ltd	256
203.21.125.0/24	AS45671	MailGuard Pty. Ltd.	256
203.21.20.0/24	AS4739	iiNet Limited	256
203.21.134.0/24	AS58716	Penrith City Council	256
203.21.15.0/24	AS7545	iVolve Pty Ltd	256
203.21.5.0/24	AS7545	Micronica	256
203.21.78.0/24	AS7545	iiNet Limited	256
203.21.121.0/24	AS7575	Universities Australia	256
203.21.37.0/24	AS7575	Australian Academic and Research Network	256
203.21.83.0/24	AS7647	OnTheNet Pty Ltd	256
203.21.95.0/24	AS9009	Formosa Sydney Pty Limited	256
203.21.22.0/24	AS9266	Fiveways International Limited	256
203.21.207.0/24	AS10143	Infinet Group Pty Ltd	256
203.21.12.0/24	AS9650	CITEC	256
203.21.9.0/24	AS10143	OCTEC Incorporated	256
203.21.40.0/24	AS133015	City of Stirling	256
203.21.140.0/24	AS135409	Western Samoa Pool	256
203.21.120.0/24	AS17882	Univision LLC	256
203.21.21.0/24	AS17889	Intraceptives Pty Ltd	256
203.21.104.0/24	AS18986	Calligo (Canada) Inc.	256
203.21.47.0/24	AS18986	Calligo (Canada) Inc.	256
203.21.65.0/24	AS208185	Phoenix Business Solutions Australia Pty Ltd	256

Hosted domains

There are 2 domain names hosted across 2 IP addresses on this ASN. Checkout our API to access full domain hosting information.

IP Address	Domain	Domains on this IP
203.21.42.111	ocsc.go.th	1

Hosted domains API

Our Hosted Domains API, or Reverse IP API returns a full list of domains that are hosted on a single IP address.

Useful for Cybersecurity

Read more

Pingable IPs

5 IPs in this range replied to an ICMP ping during our most recent internet scan. Learn more.

IP Address	ASN	Details
203.21.42.255	AS56118 OCSC-TH	`3.41ms` from Bangkok, TH
203.21.43.12	AS56118 OCSC-TH	`3.41ms` from Bangkok, TH

Other Pingable IPs

Below is a random selection of 25 IPs that replied to an ICMP ping during our most recent internet scan.

IP Address	ASN	Details
68.118.226.87	AS20115 Charter Communications LLC	`12.19ms` from Ashburn, US
54.187.105.103	AS16509 Amazon.com, Inc.	`0.19ms` from Boardman, US
181.45.143.55	AS27747 Telecentro S.A.	`6.36ms` from Buenos Aires, AR
217.182.33.7	AS16276 OVH SAS	`0.10ms` from Gravelines, FR
197.91.220.231	AS20011 Dimension Data	`2.24ms` from Johannesburg, ZA
144.34.134.247	AS25820 IT7 Networks Inc	`0.33ms` from Los Angeles, US
178.68.81.247	AS12389 PJSC Rostelecom	`17.61ms` from Saint Petersburg, RU
51.154.83.71	AS15796 Salt Mobile SA	`1.69ms` from Zuerich, CH
16.62.90.151	AS16509 Amazon.com, Inc.	`0.36ms` from Zuerich, CH
172.72.86.119	AS11426 Charter Communications Inc	`4.29ms` from Charlotte, US
52.95.120.7	AS16509 Amazon.com, Inc.	`0.43ms` from Dublin, IE
20.234.86.119	AS8075 Microsoft Corporation	`0.20ms` from Dublin, IE
170.255.247.247	AS213160 Council of the EU, General Secretariat	`3.90ms` from Gravelines, FR
90.195.11.103	AS5607 Sky UK Limited	`10.27ms` from London, GB
75.113.98.23	AS33363 Charter Communications, Inc	`8.84ms` from Los Angeles, US
2.40.179.183	AS30722 Vodafone Italia S.p.A.	`1.66ms` from Milan, IT
176.193.91.119	AS12714 PJSC MegaFon	`2.28ms` from Moscow, RU
52.194.166.167	AS16509 Amazon.com, Inc.	`0.22ms` from Tokyo, JP
24.150.227.183	AS7992 Cogeco Connexion Inc.	`6.99ms` from Toronto, CA
99.243.165.7	AS812 Rogers Communications Canada Inc.	`7.12ms` from Toronto, CA
106.75.46.7	AS23724 IDC, China Telecommunications Corporation	`2.73ms` from Beijing, CN
45.7.189.23	AS266595 NOVA CONEXAO INTERNET LTDA	`8.00ms` from Chapeco, BR
68.148.241.167	AS6327 Shaw Communications Inc.	`3.80ms` from Edmonton, CA
73.145.126.135	AS7922 Comcast Cable Communications, LLC	`8.89ms` from Flint, US
116.104.152.167	AS7552 Viettel Group	`3.23ms` from Hanoi, VN

Traceroute

Below is a recent traceroute taken from the IPinfo ProbeNet to an IP in this range. Learn more.

traceroute -a -n -q1 -f5 203.21.42.255

traceroute to 203.21.42.255 (203.21.42.255): 64 hops max, 52 byte packets

5 [AS3491] 116.206.112.8 0.56 ms

6 [AS7693] 58.181.255.225 0.67 ms

7 [AS7693] 58.181.253.54 0.454 ms

8 [AS7693] 203.195.104.76 0.381 ms

9 [AS56118] 203.21.42.255 3.657 ms

Measurement taken from

IPinfo ProbeNet in Bangkok, TH

On October 17th 2025

What are IP address ranges?

IP address ranges, or netblocks, are groups of related IP addresses. They are usually represented as a base IP address, followed by a slash, and then a netmask which represents how many IP addresses are contained within the netblock. This format is known as CIDR. You'll also sometimes see netblocks given as a start ip address, and an end ip address, or an ip address range.

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