203.21.37.0/24

AS7575  ·  Australian Academic and Research Network (AARNet)

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Summary

Country Australia
Domain aarnet.edu.au
ASN AS7575
Registry APNIC
ID AARNET

WHOIS Details

inetnum:        203.21.37.0 - 203.21.37.255
netname:        AARNET
descr:          Australian Academic and Research Network
country:        AU
org:            ORG-AAAR1-AP
admin-c:        ANOC-AP
tech-c:         ANOC-AP
abuse-c:        AA1638-AP
status:         ALLOCATED 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:        ** Conversion note - reference 'DH8766' changed to 'DH8766-AP'
remarks:        Record imported from AUNIC as part of AUNIC->APNIC migration
remarks:        Please see http://www.apnic.net/db/aunic/
remarks:        --------------------------------------------------------
notify:         irrcontact@aarnet.edu.au
mnt-by:         APNIC-HM
mnt-lower:      MAINT-AARNET-AP
mnt-routes:     MAINT-AARNET-AP
mnt-irt:        IRT-AARNET-AU
last-modified:  2023-07-17T01:31:18Z
source:         APNIC

irt:            IRT-AARNET-AU
address:        AARNet Pty Ltd
e-mail:         abuse@aarnet.edu.au
abuse-mailbox:  abuse@aarnet.edu.au
admin-c:        SM6-AP
tech-c:         ANOC-AP
auth:           # Filtered
remarks:        abuse@aarnet.edu.au was validated on 2025-10-07
mnt-by:         MAINT-AARNET-AP
last-modified:  2025-10-07T13:30:20Z
source:         APNIC

organisation:   ORG-AAAR1-AP
org-name:       Australian Academic and Research Network
org-type:       LIR
country:        AU
address:        Building 9
address:        Banks Street
phone:          +61-2-6222-3530
fax-no:         +61-2-6222-3535
e-mail:         irrcontact@aarnet.edu.au
mnt-ref:        APNIC-HM
mnt-by:         APNIC-HM
last-modified:  2023-09-05T02:14:44Z
source:         APNIC

role:           ABUSE AARNETAU
country:        ZZ
address:        AARNet Pty Ltd
phone:          +000000000
e-mail:         abuse@aarnet.edu.au
admin-c:        SM6-AP
tech-c:         ANOC-AP
nic-hdl:        AA1638-AP
remarks:        Generated from irt object IRT-AARNET-AU
remarks:        abuse@aarnet.edu.au was validated on 2025-10-07
abuse-mailbox:  abuse@aarnet.edu.au
mnt-by:         APNIC-ABUSE
last-modified:  2025-10-07T13:30:49Z
source:         APNIC

role:           AARNet Network Operations Centre
remarks:        
remarks:        
remarks:        
remarks:        Send abuse reports to abuse@aarnet.edu.au
remarks:        Please include timestamps and offset to UTC in logs
remarks:        Peering requests to peering@aarnet.edu.au
remarks:        
address:        AARNet Pty Ltd
address:        GPO Box 1559
address:        Canberra
address:        ACT  2601
country:        AU
phone:          +61 1300 275 662
phone:          +61 2 6222 3555
e-mail:         noc@aarnet.edu.au
admin-c:        ANOC-AP
tech-c:         ANOC-AP
nic-hdl:        ANOC-AP
mnt-by:         MAINT-AARNET-AP
last-modified:  2020-12-02T07:35:01Z
source:         APNIC

route:          203.21.37.0/24
origin:         AS7575
descr:          Australian Academic and Research Network Building 9 Banks Street
mnt-by:         MAINT-AARNET-AP
last-modified:  2023-07-18T02:54:36Z
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
203.21.42.0/23 AS56118 47/111 Tiwanon Road 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
203.21.83.0/24 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 no domains currently hosted on this ASN.

Hosted domains API

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Useful for Cybersecurity

Pingable IPs

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

IP Address ASN Details
203.21.37.3 AS7575 Australian Academic and Research Network (AARNet) 0.56ms 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
154.247.85.184 AS36947 Telecom Algeria 12.81ms from Algiers, DZ
71.120.132.152 AS701 Verizon Business 8.78ms from Ashburn, US
151.145.188.136 AS7029 Windstream Communications LLC 0.72ms from Ashburn, US
136.113.53.88 AS396982 Google LLC 0.13ms from Council Bluffs, US
35.193.115.152 AS396982 Google LLC 0.13ms from Council Bluffs, US
14.254.247.200 AS45899 VNPT Corp 0.91ms from Da Nang, VN
41.82.159.88 AS8346 SONATEL-AS Autonomous System 2.33ms from Dakar, SN
20.233.181.56 AS8075 Microsoft Corporation 0.92ms from Dubai, AE
212.224.81.8 AS44066 firstcolo GmbH 0.47ms from Frankfurt am Main, DE
151.240.9.40 AS16276 OVH SAS 1.59ms from Gravelines, FR
109.110.254.72 AS35432 Cablenet Communication Systems plc 6.36ms from Larnaca, CY
176.26.143.40 AS5607 Sky UK Limited 1.59ms from London, GB
116.72.136.136 AS17488 Hathway IP Over Cable Internet 4.10ms from Mumbai, IN
67.248.211.184 AS11351 Charter Communications Inc 12.62ms from New York City, US
98.10.70.152 AS11351 Charter Communications Inc 19.64ms from New York City, US
154.202.4.40 AS20326 TeraSwitch Networks Inc. 1.03ms from New York City, US
174.44.239.248 AS6128 Cablevision Systems Corp. 11.72ms from Secaucus, US
14.39.14.88 AS4766 Korea Telecom 1.28ms from Seoul, KR
134.238.23.200 AS394089 Google LLC 0.94ms from Singapore, SG
126.122.140.152 AS17676 SoftBank Corp. 9.40ms from Tokyo, JP
85.127.94.104 AS8412 T-Mobile Austria GmbH 4.78ms from Vienna, AT
52.239.243.56 AS8075 Microsoft Corporation 0.47ms from Amsterdam, NL
67.172.58.88 AS7922 Comcast Cable Communications, LLC 10.07ms from Ashburn, US
46.176.212.56 AS3329 VODAFONE-PANAFON HELLENIC TELECOMMUNICATIONS COMPANY SA 5.03ms from Athens, GR
75.91.178.56 AS7029 Windstream Communications LLC 12.31ms from Atlanta, US

Traceroute

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

$
traceroute -a -n -q1 -f4 203.21.37.5
traceroute to 203.21.37.5 (203.21.37.5): 64 hops max, 52 byte packets
4 [AS3356] 217.163.113.74 10.645 ms
5 [AS7575] 113.197.15.2 264.308 ms
6 [AS7575] 138.44.18.79 262.206 ms
7 [AS7575] 203.21.37.5 262.37 ms
Measurement taken from IPinfo ProbeNet in Amsterdam, NL
On

What are IP address ranges?

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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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