203.17.40.0/21

AS1221  ·  Telstra Limited

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Summary

Country Australia
Domain telstra.net
ASN AS1221
Registry APNIC
ID TELSTRAINTERNET-AU

WHOIS Details

inetnum:        203.17.40.0 - 203.17.47.255
netname:        TELSTRAINTERNET-AU
descr:          Telstra Limited
country:        AU
org:            ORG-TC6-AP
admin-c:        TIAR-AP
tech-c:         TAN2-AP
status:         ALLOCATED PORTABLE
abuse-c:        AT1005-AP
remarks:        -----
remarks:        All reports regarding SPAM or security breaches
remarks:        should be addressed to abuse@telstra.net
remarks:        ------
mnt-by:         APNIC-HM
mnt-lower:      MAINT-AU-TIAR-AP
mnt-routes:     MAINT-AU-TIAR-AP
mnt-irt:        IRT-TELSTRA-AU
last-modified:  2024-05-10T00:50:23Z
source:         APNIC

irt:            IRT-TELSTRA-AU
address:        Telstra Internet
e-mail:         abuse@telstra.net
abuse-mailbox:  abuse@telstra.net
admin-c:        TIAR-AP
tech-c:         TIAR-AP
auth:           # Filtered
remarks:        abuse@telstra.net was validated on 2026-01-26
mnt-by:         MAINT-AU-TIAR-AP
last-modified:  2026-01-26T01:19:20Z
source:         APNIC

organisation:   ORG-TC6-AP
org-name:       Telstra Limited
org-type:       LIR
country:        AU
address:        242 Exhibition Street
e-mail:         corporateaddressing@team.telstra.com
mnt-ref:        APNIC-HM
mnt-by:         APNIC-HM
last-modified:  2024-12-06T08:30:50Z
source:         APNIC

role:           ABUSE TELSTRAAU
country:        ZZ
address:        Telstra Internet
phone:          +000000000
e-mail:         abuse@telstra.net
admin-c:        TIAR-AP
tech-c:         TIAR-AP
nic-hdl:        AT1005-AP
remarks:        Generated from irt object IRT-TELSTRA-AU
remarks:        abuse@telstra.net was validated on 2026-01-26
abuse-mailbox:  abuse@telstra.net
mnt-by:         APNIC-ABUSE
last-modified:  2026-01-26T01:19:29Z
source:         APNIC

role:           Telstra AU NOC
address:        Telstra Internet
address:        242 Exhibition Street
address:        Melbourne
address:        VIC 3000
country:        AU
phone:          +61 3 8650 3305
e-mail:         ipnoc-au@team.telstra.com
admin-c:        TIAR-AP
tech-c:         TIAR-AP
nic-hdl:        TAN2-AP
mnt-by:         MAINT-AU-TIAR-AP
last-modified:  2025-11-26T05:11:17Z
source:         APNIC

person:         Telstra Internet Address Registry
address:        Telstra Internet
address:        242 Exhibition St
address:        Melbourne
address:        VIC 3000
country:        AU
phone:          +61 000000000
e-mail:         addressing@telstra.net
nic-hdl:        TIAR-AP
remarks:        Telstra Internet Address Registry Role Object
mnt-by:         MAINT-AU-TIAR-AP
last-modified:  2021-12-09T22:28:56Z
source:         APNIC

route:          203.17.40.0/21
origin:         AS1221
descr:          Telstra Corporation 242 Exhibition Street
mnt-by:         MAINT-AU-TIAR-AP
last-modified:  2021-01-22T04:40:10Z
source:         APNIC

route:          203.17.40.0/21
origin:         AS19905
descr:          Telstra Corporation Limited 242 Exhibition Street
mnt-by:         MAINT-AU-TIAR-AP
last-modified:  2022-09-12T02:17:47Z
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 AS7545 iiNet Limited 2,048
203.17.168.0/21 AS9893 Cenitex 2,048
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
203.17.240.0/22 AS140065 CiFi Pty Ltd 1,024
203.17.204.0/22 AS4826 Mitsubishi Electric Australia Pty Ltd 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
203.17.212.0/23 AS38333 My Net Fone Limited 512
203.17.220.0/23 AS8075 AUSTRADE 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
203.17.138.0/24 AS16509 SingTel Optus Pty Ltd 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 is 1 domain name hosted across 1 IP address on this ASN. Checkout our API to access full domain hosting information.

IP Address Domain Domains on this IP
203.17.42.59 stratinnova.net 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

Pingable IPs

No IPs in this range replied to an ICMP ping during our most recent internet scan. Learn more.

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
212.129.20.165 AS12876 SCALEWAY S.A.S. 0.23ms from Amsterdam, NL
102.189.222.53 AS24835 Vodafone Data 9.83ms from Cairo, EG
71.74.67.69 AS10796 Charter Communications Inc 9.23ms from Columbus, US
103.151.0.37 AS140612 DESH COMMUNICATIONS 0.59ms from Dhaka, BD
73.166.247.245 AS7922 Comcast Cable Communications, LLC 3.67ms from Houston, US
90.36.1.229 AS3215 Orange S.A. 7.06ms from Le Lamentin, MQ
150.241.10.85 AS207714 Fundacion Tecnalia Research and Innovation 8.00ms from Madrid, ES
201.185.213.117 AS13489 UNE EPM TELECOMUNICACIONES S.A. 9.29ms from Medellin, CO
176.60.66.149 AS25106 Mobile TeleSystems JLLC 5.25ms from Minsk, BY
61.203.215.197 AS7679 QTnet,Inc. 6.84ms from Osaka, JP
81.255.129.21 AS3215 Orange S.A. 3.39ms from Paris, FR
135.13.12.21 AS8075 Microsoft Corporation 0.29ms from Saint Thomas Mount, IN
37.232.187.5 AS12714 PJSC MegaFon 11.12ms from Samara, RU
61.169.130.181 AS4812 China Telecom (Group) 3.23ms from Shanghai, CN
185.56.172.213 AS50606 Horyzont Technologie Internetowe sp.z.o.o. 0.31ms from Warsaw, PL
2.132.15.197 AS9198 JSC Kazakhtelecom 2.10ms from Almaty, KZ
185.164.63.229 AS61327 MTX Connect S. a r.l. 2.20ms from Amsterdam, NL
100.28.88.85 AS14618 Amazon.com, Inc. 0.58ms from Ashburn, US
120.15.235.101 AS4837 CHINA UNICOM China169 Backbone 10.79ms from Beijing, CN
41.82.114.229 AS8346 SONATEL-AS Autonomous System 3.29ms from Dakar, SN
134.3.178.101 AS3209 Vodafone GmbH 4.65ms from Frankfurt am Main, DE
113.98.83.37 AS4134 CHINANET-BACKBONE 2.14ms from Guangzhou, CN
203.233.212.213 AS7557 Korea Trade Network 1.27ms from Incheon, KR
39.40.142.5 AS17557 Pakistan Telecommunication Company Limited 12.17ms from Islamabad, PK
180.32.51.133 AS4713 NTT DOCOMO BUSINESS,Inc. 13.00ms from Osaka, JP

Traceroute

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

$
traceroute -a -n -q1 -m7 203.17.41.78
traceroute to 203.17.41.78 (203.17.41.78): 7 hops max, 52 byte packets
1 [AS15169] 142.251.244.117 130.799 ms
2 [AS15169] 192.178.97.144 130.617 ms
3 *
4 [AS1221] 203.50.11.176 135.048 ms
5 *
6 *
7 *
Measurement taken from IPinfo ProbeNet in Chang-hua, TW
On

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.

Traffic works its way around the internet based on the routing table, which contains a list of networks and their associated netblocks.

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