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:        ANOC-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:  2026-01-30T04:42:26Z
source:         APNIC

organisation:   ORG-AAAR1-AP
org-name:       Australian Academic and Research Network
org-type:       LIR
country:        AU
address:        PO Box 5519
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:  2026-01-30T13:04:55Z
source:         APNIC

role:           ABUSE AARNETAU
country:        ZZ
address:        AARNet Pty Ltd
phone:          +000000000
e-mail:         abuse@aarnet.edu.au
admin-c:        ANOC-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:  2026-01-30T04:42:58Z
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
203.21.112.0/21 AS133612 VODAFONE AUSTRALIA PTY LIMITED 2,048
203.21.24.0/21 AS703 Verizon Australia PTY Limited 2,048
203.21.140.0/22 AS135409 Kacific Broadband Satellites Pte Ltd 1,024
203.21.108.0/22 AS133612 VODAFONE AUSTRALIA PTY LIMITED 1,024
203.21.150.0/23 AS137896 Hunter Water Corporation 512
203.21.128.0/23 AS2764 St. Vincent's Health & Aged Care Ltd. 512
203.21.130.0/23 AS10148 The University of Melbourne 512
203.21.42.0/23 AS56118 47/111 Tiwanon Road 512
203.21.76.0/23 AS38549 Viewbank Rise Networks 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
203.21.5.0/24 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
203.21.65.0/24 AS154329 Phoenix Business Solutions Australia Pty Ltd 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

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

Pingable IPs

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

IP Address ASN Details
203.21.37.5 AS7575 Australian Academic and Research Network (AARNet) 0.57ms 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
79.242.120.104 AS3320 Deutsche Telekom AG 5.34ms from Berlin, DE
93.122.211.104 AS8953 Orange Romania S.A. 19.05ms from Bucharest, RO
1.26.75.248 AS4837 CHINA UNICOM China169 Backbone 10.16ms from Changchun, CN
85.197.65.8 AS25220 equada network GmbH 0.40ms from Frankfurt am Main, DE
86.161.190.88 AS2856 British Telecommunications PLC 4.09ms from London, GB
76.89.232.88 AS20001 Charter Communications Inc 4.79ms from Los Angeles, US
185.149.198.88 AS39728 Likhno Dmitriy trading as Luganet 18.51ms from Moscow, RU
114.188.106.72 AS4713 NTT DOCOMO BUSINESS,Inc. 5.40ms from Osaka, JP
88.175.65.152 AS12322 Free SAS 5.22ms from Paris, FR
90.39.59.152 AS3215 Orange S.A. 6.39ms from Paris, FR
190.211.44.200 AS14117 Telefonica del Sur S.A. 8.77ms from Santiago, CL
114.33.176.232 AS3462 Data Communication Business Group 3.64ms from Taichung, TW
219.62.66.168 AS17676 SoftBank Corp. 3.15ms from Tokyo, JP
222.138.135.120 AS4837 CHINA UNICOM China169 Backbone 4.96ms from Zhengzhou, CN
5.76.92.232 AS9198 JSC Kazakhtelecom 7.75ms from Astana, KZ
105.68.142.120 AS36884 Wana Corporate 4.42ms from Casablanca, MA
154.46.174.136 AS204096 Manutenzione ed Assistenza Computers S.r.l. 17.60ms from Frosinone, IT
116.104.225.200 AS7552 Viettel Group 3.57ms from Hanoi, VN
95.58.93.184 AS9198 JSC Kazakhtelecom 4.62ms from Karagandy, KZ
90.155.12.8 AS20712 Andrews & Arnold Ltd 4.16ms from London, GB
34.111.159.56 AS396982 Google LLC 0.07ms from Melbourne, AU
104.189.249.88 AS7018 AT&T Enterprises, LLC 11.17ms from Miami, US
79.41.131.24 AS3269 Telecom Italia S.p.A. 1.91ms from Milan, IT
5.36.215.184 AS28885 OmanTel NAP 2.48ms from Muscat, OM
201.40.190.104 AS8167 V tal 1.96ms from Novo Hamburgo, BR

Traceroute

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

$
traceroute -a -n -q1 -f4 203.21.37.2
traceroute to 203.21.37.2 (203.21.37.2): 64 hops max, 52 byte packets
4 [] 103.16.102.67 52.395 ms
5 [AS7575] 113.197.15.2 152.148 ms
6 [AS7575] 138.44.18.79 148.579 ms
7 [AS7575] 203.21.37.2 154.813 ms
Measurement taken from IPinfo ProbeNet in Yangon, MM
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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