Top-Level Domain

.au

Aggregated statistics for the top-level domain

Apex domains

1,643,615

we've enumerated

Subdomains seen

5,612,600

CT + DNS + brute

TLS certs

—

naming .au

Hosting ASNs

—

distinct origins

Apex domains with the most known subdomains — large orgs, telecoms, hosters.

Apex	Subdomains
3cx.com.au	11,348
cdu.edu.au	10,099
tiks.com.au	9,246
nsw.gov.au	9,160
unsw.edu.au	7,186
chocolatecoded.com.au	6,906
studentserver.com.au	6,327
dpvps.com.au	5,779
digitalfinancialadvice.com.au	5,231
unimelb.edu.au	4,669
irys.net.au	4,461
dom.au	4,380
altf4solutions.com.au	4,117
anu.edu.au	4,098
illegal.au	3,295
accept.com.au	3,080
lib.com.au	2,991
v8.com.au	2,883
openbank.com.au	2,849
comms.com.au	2,794
zimbra.com.au	2,740
streetwise.com.au	2,648
version.com.au	2,639
sweetscents.com.au	2,628
fom.au	2,616
chemplus.com.au	2,615
themills.com.au	2,603
groups.com.au	2,561
rmb.com.au	2,505
griffith.edu.au	2,484
ltd.au	2,465
connexus.net.au	2,455
uk.au	2,449
telstra.com.au	2,445
remote.net.au	2,445
106.com.au	2,349
bcr.au	2,312
adv.com.au	2,309
albanycreekrealestate.com.au	2,279
crackerjack.com.au	2,243
sealife.com.au	2,202
ecig.com.au	2,173
classr3.com.au	2,123
eiw.com.au	2,103
201.com.au	2,094
mocloud.com.au	2,073
ecu.edu.au	1,986
westernsydney.edu.au	1,890
sydney.edu.au	1,841
rediweb.com.au	1,781

Issuer (CA)	Certs
Let's Encrypt	8,594
Amazon	5,792
DigiCert	4,728
Sectigo	2,921
YR1	1,576
YR2	1,574
GoDaddy	1,073
GlobalSign	707
YE2	669
YE1	597
WR3	347
Cloudflare	256
GoDaddy (Starfield)	250
ZeroSSL	112
cPanel, Inc. Certification Authority	103

Forward-DNS crawler hasn't resolved enough .au apexes to BGP-attributable IPs.

Body-fetcher hasn't covered enough .au sites yet for stack patterns to emerge.

ℹ Coverage will improve significantly once CZDS zone-file access is granted for this TLD.