203.21.125.0/24

AS45671 · Wholesale Services Provider

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Summary

Country	Australia
Domain	mailguard.com.au
ASN	AS45671
Registry	APNIC
ID	MAILGUA-AU

WHOIS Details

inetnum:        203.21.125.0 - 203.21.125.255
netname:        MAILGUA-AU
descr:          MailGuard Pty. Ltd.
descr:          68-72 York St.
descr:          Sth Melbourne VIC 3205
country:        AU
org:            ORG-MPL15-AP
admin-c:        MPLA7-AP
tech-c:         MPLA7-AP
abuse-c:        AA1642-AP
status:         ASSIGNED PORTABLE
mnt-by:         APNIC-HM
mnt-routes:     MAINT-AU-MAILGUARD
mnt-irt:        IRT-AU-MAILGUARD
last-modified:  2020-06-22T05:29:29Z
source:         APNIC

irt:            IRT-AU-MAILGUARD
address:        68-72 York St.
address:        South Melbourne VIC 3205
phone:          +61 3 9694 4444
fax-no:         +61 3 9694 4410
e-mail:         netops@mailguard.com.au
abuse-mailbox:  netops@mailguard.com.au
admin-c:        MPLA7-AP
tech-c:         MPLA7-AP
auth:           # Filtered
remarks:        netops@mailguard.com.au was validated on 2025-07-22
mnt-by:         MAINT-AU-MAILGUARD
last-modified:  2025-09-04T07:05:09Z
source:         APNIC

organisation:   ORG-MPL15-AP
org-name:       MAILGUARD PTY. LTD.
org-type:       LIR
country:        AU
address:        68-72 York St
phone:          +61-3-9694-4444
fax-no:         +61-3-9694-4410
e-mail:         netops@mailguard.com.au
mnt-ref:        APNIC-HM
mnt-by:         APNIC-HM
last-modified:  2023-09-05T02:16:24Z
source:         APNIC

role:           ABUSE AUMAILGUARD
country:        ZZ
address:        68-72 York St.
address:        South Melbourne VIC 3205
phone:          +61 3 9694 4444
e-mail:         netops@mailguard.com.au
admin-c:        MPLA7-AP
tech-c:         MPLA7-AP
nic-hdl:        AA1642-AP
remarks:        Generated from irt object IRT-AU-MAILGUARD
remarks:        netops@mailguard.com.au was validated on 2025-07-22
abuse-mailbox:  netops@mailguard.com.au
mnt-by:         APNIC-ABUSE
last-modified:  2025-07-22T23:27:55Z
source:         APNIC

role:           MailGuard Pty. Ltd. administrator
address:        68-72 York St.
address:        South Melbourne VIC 3205
country:        AU
phone:          +61 3 9694 4444
fax-no:         +61 3 9694 4410
e-mail:         netops@mailguard.com.au
admin-c:        SC17-AP
tech-c:         SC17-AP
nic-hdl:        MPLA7-AP
mnt-by:         MAINT-AU-MAILGUARD
last-modified:  2014-07-04T05:42:50Z
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
203.21.20.0/24	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 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

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

IP Address	ASN	Details
203.21.125.204	AS45671 Wholesale Services Provider	`0.13ms` from Melbourne, 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
20.56.229.168	AS8075 Microsoft Corporation	`0.25ms` from Amsterdam, NL
62.234.40.72	AS45090 Shenzhen Tencent Computer Systems Company Limited	`1.76ms` from Beijing, CN
34.220.233.216	AS16509 Amazon.com, Inc.	`0.51ms` from Boardman, US
131.161.25.136	AS264359 Start Telecomunicações EIRELI	`6.77ms` from Campina Grande, BR
14.227.21.56	AS45899 VNPT Corp	`2.37ms` from Ho Chi Minh City, VN
213.120.7.8	AS2856 British Telecommunications PLC	`0.87ms` from London, GB
47.229.219.168	AS20115 Charter Communications LLC	`4.36ms` from Los Angeles, US
86.57.183.152	AS6697 Republican Unitary Telecommunication Enterprise Beltelecom	`5.15ms` from Minsk, BY
104.46.226.152	AS8075 Microsoft Corporation	`0.16ms` from Osaka, JP
34.234.87.88	AS14618 Amazon.com, Inc.	`0.44ms` from Reston, US
118.52.131.232	AS4766 Korea Telecom	`2.14ms` from Seoul, KR
121.140.214.168	AS4766 Korea Telecom	`1.15ms` from Seoul, KR
4.217.128.184	AS8075 Microsoft Corporation	`0.32ms` from Seoul, KR
51.5.68.24	AS8075 Microsoft Corporation	`1.93ms` from Berlin, DE
3.18.163.104	AS16509 Amazon.com, Inc.	`0.15ms` from Columbus, US
181.218.196.8	AS28573 Claro NXT Telecomunicacoes Ltda	`3.05ms` from Curitiba, BR
84.183.15.56	AS3320 Deutsche Telekom AG	`2.27ms` from Duesseldorf, DE
3.79.94.72	AS16509 Amazon.com, Inc.	`0.15ms` from Frankfurt am Main, DE
58.186.58.56	AS18403 FPT Telecom Company	`1.46ms` from Hanoi, VN
98.211.69.200	AS7922 Comcast Cable Communications, LLC	`9.53ms` from Herndon, US
156.237.177.88	AS134548 DXTL Tseung Kwan O Service	`0.73ms` from Hong Kong, HK
149.120.170.104	AS398478 PEG TECH INC	`0.45ms` from Hong Kong, HK
178.89.62.104	AS9198 JSC Kazakhtelecom	`4.67ms` from Karagandy, KZ
51.140.156.136	AS8075 Microsoft Corporation	`0.18ms` from London, GB
76.171.109.152	AS20001 Charter Communications Inc	`4.49ms` from Los Angeles, US

Traceroute

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

traceroute -a -n -q1 -f9 203.21.125.6

traceroute to 203.21.125.6 (203.21.125.6): 64 hops max, 52 byte packets

9 [AS45671] 203.21.125.6 0.445 ms

Measurement taken from

IPinfo ProbeNet in Melbourne, AU

On October 30th 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.

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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