203.17.138.0/24

AS16509 · Amazon.com, Inc.

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Summary

Country	Australia
Domain	optus.com.au
ASN	AS16509
Registry	APNIC
ID	OPTUSCOM-AU

WHOIS Details

inetnum:        203.17.138.0 - 203.17.138.255
netname:        OPTUSCOM-AU
descr:          SingTel Optus Pty Ltd
country:        AU
org:            ORG-SOPL2-AP
admin-c:        OA3-AP
tech-c:         OA3-AP
abuse-c:        AO399-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:        --------------------------------------------------------
remarks:        -----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----
mnt-by:         APNIC-HM
mnt-routes:     MAINT-OPTUSCOM-AP
mnt-irt:        IRT-OPTUSCOM-AU
last-modified:  2024-03-06T00:40:32Z
source:         APNIC

irt:            IRT-OPTUSCOM-AU
address:        SingTel Optus Pty Ltd
address:        Optus Macquarie Park (OCS)
address:        1 Lyonpark Road
address:        Macquarie Park NSW 2113
e-mail:         abuse@optusnet.com.au
abuse-mailbox:  abuse@optusnet.com.au
admin-c:        OA3-AP
tech-c:         OA3-AP
auth:           # Filtered
remarks:        abuse@optusnet.com.au was validated on 2025-12-23
mnt-by:         MAINT-OPTUSCOM-AP
last-modified:  2026-02-02T03:10:28Z
source:         APNIC

organisation:   ORG-SOPL2-AP
org-name:       SingTel Optus Pty Ltd
org-type:       LIR
country:        AU
address:        Optus Macquarie Park (OCS)
address:        1 Lyonpark Road, Macquarie Park
phone:          +61-2-8082-7800
fax-no:         +61-2-8082-7100
e-mail:         irr-admin@optus.com.au
mnt-ref:        APNIC-HM
mnt-by:         APNIC-HM
last-modified:  2025-09-25T13:05:45Z
source:         APNIC

role:           ABUSE OPTUSCOMAU
country:        ZZ
address:        SingTel Optus Pty Ltd
address:        Optus Macquarie Park (OCS)
address:        1 Lyonpark Road
address:        Macquarie Park NSW 2113
phone:          +000000000
e-mail:         abuse@optusnet.com.au
admin-c:        OA3-AP
tech-c:         OA3-AP
nic-hdl:        AO399-AP
remarks:        Generated from irt object IRT-OPTUSCOM-AU
remarks:        abuse@optusnet.com.au was validated on 2025-12-23
abuse-mailbox:  abuse@optusnet.com.au
mnt-by:         APNIC-ABUSE
last-modified:  2025-12-23T22:44:48Z
source:         APNIC

role:           OPTUS IP ADMINISTRATORS
address:        SingTel Optus Pty Ltd
address:        Optus Macquarie Park (OCS)
address:        1 Lyonpark Road
address:        Macquarie Park  NSW 2113
address:        AUSTRALIA
country:        AU
phone:          +61 2 8082 7800
fax-no:         +61 2 8082 7100
e-mail:         ipadmin@optus.net.au
remarks:        send spam/abuse reports to abuse@optus.net.au
remarks:        please use http://www.apnic.net/db/spam.html
remarks:        to identify networks before sending reports and
remarks:        always include full headers/logs.
admin-c:        NC8-AP
admin-c:        IA65-AP
tech-c:         NC8-AP
tech-c:         IA65-AP
tech-c:         OH23-AP
nic-hdl:        OA3-AP
notify:         hostmaster@optus.net.au
mnt-by:         MAINT-OPTUSCOM-AP
last-modified:  2011-12-06T00:10:13Z
source:         APNIC

route:          203.17.138.0/24
origin:         AS14618
descr:          SingTel Optus Pty Ltd Optus Macquarie Park (OCS) Building A, Level 2 1 Lyonpark Road, Macquarie Park
mnt-by:         MAINT-OPTUSCOM-AP
last-modified:  2024-03-06T00:48:52Z
source:         APNIC

route:          203.17.138.0/24
origin:         AS16509
descr:          SingTel Optus Pty Ltd Optus Macquarie Park (OCS) Building A, Level 2 1 Lyonpark Road, Macquarie Park
mnt-by:         MAINT-OPTUSCOM-AP
last-modified:  2024-03-06T00:48:46Z
source:         APNIC

Nearby Ranges

BGP prefixes that overlap with 203.17.0.0/16

Range	ASN	Company	Num of IPs
203.17.96.0/21	AS4739	iiNet Limited	2,048
203.17.168.0/21	AS9893	Cenitex	2,048
203.17.40.0/21	AS1221	Telstra Limited	2,048
203.17.240.0/22	AS140065	CiFi Pty Ltd	1,024
203.17.204.0/22	AS4826	Mitsubishi Electric Australia Pty Ltd	1,024
203.17.76.0/22	AS17766	Nexon Asia Pacific Pty Ltd	1,024
203.17.32.0/22	AS24543	First Data Resources Australia	1,024
203.17.148.0/22	AS38611	Bendigo Community Telco Limited	1,024
203.17.244.0/23	AS137409	GSL Networks Pty LTD	512
203.17.220.0/23	AS8075	AUSTRADE	512
203.17.212.0/23	AS38333	My Net Fone Limited	512
203.17.245.0/24	AS137409	GSL Networks Pty LTD - Amsterdam	256
203.17.137.0/24	AS150151	SKY COMMUNICATIONS INTERNET SERVICES	256
203.17.177.0/24	AS154167	Rackmill	256
203.17.165.0/24	AS16509	Uniware Managed Services Pty Ltd	256
203.17.236.0/24	AS17632	Barristers' Chambers Limited,	256
203.17.70.0/24	AS17807	State Library of Queensland	256
203.17.23.0/24	AS17882	Univision LLC	256
203.17.126.0/24	AS209242	LACHTARISTO HOLDINGS LIMITED	256
203.17.123.0/24	AS212384	Private Customer	256
203.17.251.0/24	AS2764	Data Analysis Australia	256
203.17.66.0/24	AS34414	Nokia Solutions and Networks Australia Pty Ltd	256
203.17.226.0/24	AS38424	KOREA CABLE TELECOM	256
203.17.36.0/24	AS38719	Dreamscape Networks PTY LTD	256
203.17.166.0/24	AS45158	ISW Technology Pty Ltd	256
203.17.253.0/24	AS45240	Realestate.com.au Limited	256
203.17.225.0/24	AS45570	Active Ideas Pty. Ltd.	256
203.17.185.0/24	AS45867	Commonwealth Bank of Australia	256
203.17.7.0/24	AS4826	City Of Kwinana	256
203.17.93.0/24	AS4826	Denver Technology	256
203.17.65.0/24	AS63996	MD Rehanur Rahman t/a M/S FNF Online	256
203.17.8.0/24	AS7545	TPG Internet Pty Ltd.	256
203.17.215.0/24	AS7637	State Library of Victoria	256
203.17.29.0/24	AS7703	Westway Nominees Pty Ltd t/a Bekkers	256
203.17.73.0/24	AS9268	Ultrahost Pty Ltd	256
203.17.167.0/24	AS9336	ID Interdomain	256
203.17.120.0/24	AS9893	Cenitex	256
203.17.31.0/24	AS10215	Microland Limited	256
203.17.163.0/24	AS9942	TPG Internet Pty Ltd.	256
203.17.237.0/24	AS10557	UAB code200	256
203.17.162.0/24	AS1221	Telstra Limited	256
203.17.194.0/24	AS131302	294/3 Vidhya Nagari Marg	256
203.17.12.0/24	AS134802	Naic Cable TV Corp.	256
203.17.180.0/24	AS135600	Whiz Communications Pte Ltd	256
203.17.181.0/24	AS135600	Whiz Communications Pte Ltd	256
203.17.214.0/24	AS136518	Department of Planning, Lands and Heritage	256
203.17.193.0/24	AS136572	The Office of the Chief Information Officer (OCIO)	256
203.17.154.0/24	AS137060	The Club Group Pty Limited	256
203.17.244.0/24	AS137409	GSL Networks Pty LTD - Amsterdam	256

Hosted domains

There are no domains currently hosted on this ASN.

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

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

IP Address	ASN	Details
203.17.138.17	AS16509 Amazon.com, Inc.	`1.71ms` from Sydney, AU

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
185.24.220.168	AS196752 Tilaa B.V.	`0.50ms` from Amsterdam, NL
18.64.234.216	AS16509 Amazon.com, Inc.	`0.18ms` from Atlanta, US
79.217.50.136	AS3320 Deutsche Telekom AG	`4.12ms` from Berlin, DE
23.14.81.104	AS16625 Akamai Technologies, Inc.	`0.31ms` from Bogotá, CO
191.80.90.136	AS22927 Telefonica de Argentina	`4.26ms` from Buenos Aires, AR
61.144.144.88	AS4134 CHINANET-BACKBONE	`2.86ms` from Guangzhou, CN
36.102.38.136	AS4134 CHINANET-BACKBONE	`15.15ms` from Hohhot, CN
196.170.112.184	AS24691 TogoTelecom, Togo	`3.73ms` from Lomé, TG
143.159.203.232	AS6871 Plusnet	`2.84ms` from London, GB
27.202.4.184	AS4837 CHINA UNICOM China169 Backbone	`4.92ms` from Qingdao, CN
105.154.250.88	AS36903 Office National des Postes et Telecommunications ONPT (Maroc Telecom) / IAM	`5.54ms` from Rabat, MA
144.195.139.104	AS30103 Zoom Video Communications, Inc	`0.59ms` from San Jose, US
216.170.173.248	AS4181 TDS TELECOM	`10.33ms` from Seattle, US
112.158.239.248	AS17858 LG POWERCOMM	`7.04ms` from Seoul, KR
43.212.157.200	AS16509 Amazon.com, Inc.	`0.31ms` from Taipei, TW
202.212.168.40	AS2514 NTT PC Communications, Inc.	`4.72ms` from Tokyo, JP
110.253.116.248	AS4837 CHINA UNICOM China169 Backbone	`8.00ms` from Beijing, CN
76.19.119.248	AS7922 Comcast Cable Communications, LLC	`5.85ms` from Boston, US
188.26.170.248	AS8708 DIGI ROMANIA S.A.	`1.12ms` from Bucharest, RO
211.138.225.168	AS56047 China Mobile communications corporation	`0.43ms` from Changsha, CN
134.94.144.120	AS680 Verein zur Foerderung eines Deutschen Forschungsnetzes e.V.	`4.74ms` from Frankfurt am Main, DE
84.23.198.152	AS15457 NOS Madeira Comunicacoes, S.A.	`19.36ms` from Lisbon, PT
82.213.247.200	AS15704 XTRA TELECOM S.A.	`1.27ms` from Madrid, ES
151.1.192.8	AS3242 REEVO S.P.A.	`1.21ms` from Milan, IT
4.232.4.72	AS8075 Microsoft Corporation	`0.14ms` from Milan, IT

Traceroute

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

traceroute -a -n -q1 -f2 -m11 203.17.138.75

traceroute to 203.17.138.75 (203.17.138.75): 11 hops max, 52 byte packets

2 [AS9924] 219.80.115.29 2.542 ms

3 [AS9924] 60.199.25.197 1.478 ms

4 [AS9924] 60.199.23.133 3.695 ms

5 [AS9924] 60.199.14.245 3.646 ms

6 [AS9924] 60.199.22.26 129.417 ms

7 [AS7713] 198.32.176.217 175.787 ms

8 [AS16509] 54.240.243.157 157.11 ms

9 *

10 *

11 *

Measurement taken from

IPinfo ProbeNet in Taipei, TW

On February 7th 2026

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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