Top-Level Domain
.io
Aggregated statistics for the top-level domain
Apex domains
692,132
we've enumerated
Subdomains seen
9,402,056
CT + DNS + brute
TLS certs
82,467
naming .io
Hosting ASNs
15
distinct origins
Domain Distribution
Apex domains with the most known subdomains — large orgs, telecoms, hosters.
| Apex | Subdomains |
|---|---|
| azurecontainerapps.io | 3,448,986 |
| keenetic.io | 1,801,057 |
| nip.io | 326,473 |
| sslip.io | 259,024 |
| azurecontainerapps-test.io | 185,582 |
| k4apps.io | 174,214 |
| nid.io | 118,142 |
| netcraze.io | 83,070 |
| starsweb.io | 73,902 |
| tktl.io | 64,511 |
| qzz.io | 51,426 |
| instruqt.io | 29,880 |
| nxcli.io | 26,700 |
| cloudhub.io | 22,330 |
| jsdelivr.io | 19,471 |
| aroapp-hcp.io | 13,710 |
| redhatworkshops.io | 12,580 |
| streamgpu.io | 11,875 |
| aroapp.io | 11,619 |
| cedevice.io | 10,030 |
| isccloud.io | 9,082 |
| tmachine.io | 8,288 |
| sfmc.io | 8,257 |
| wiz.io | 7,925 |
| upli.io | 7,557 |
| ikarem.io | 7,416 |
| icore.io | 6,907 |
| cxnpl.io | 6,558 |
| affiliatereel.io | 6,064 |
| galaxy-dev.io | 5,333 |
| cs-ide.io | 5,062 |
| cwan.io | 4,883 |
| azmk8s.io | 4,805 |
| lumar.io | 4,781 |
| fluffy-otter-5.telebit.io | 4,767 |
| sapcloud.io | 4,710 |
| enablon.io | 4,678 |
| backname.io | 4,664 |
| hotelengine.io | 4,383 |
| pegcloud.io | 4,353 |
| serious-cat-33.telebit.io | 4,301 |
| litegallery.io | 4,279 |
| gigantic.io | 4,239 |
| zuddl.io | 4,179 |
| wdr.io | 4,176 |
| ordinary-elephant-58.telebit.io | 3,969 |
| dishcloud.io | 3,944 |
| enotis.io | 3,857 |
| idemia.io | 3,798 |
| amazee.io | 3,798 |
Top Certificate Issuers
| Issuer (CA) | Certs |
|---|---|
| Amazon | 29,660 |
| Let's Encrypt | 24,280 |
| WR3 | 5,163 |
| ca | 4,697 |
| YR1 | 1,889 |
| YR2 | 1,818 |
| YE2 | 1,744 |
| Sectigo | 1,669 |
| YE1 | 1,648 |
| RunCloud WebSSL Root CA | 1,572 |
| DigiCert | 1,359 |
| Cloudflare | 1,220 |
| GoDaddy | 709 |
| ZeroSSL | 433 |
| GlobalSign | 363 |
Top Hosting ASNs
| ASN | Name | .io domains |
|---|---|---|
| AS16509 | Amazon.com | 354,717 |
| AS8075 | Microsoft | 321,975 |
| AS13335 | Cloudflare | 133,484 |
| AS396982 | Google Cloud | 59,387 |
| AS14061 | DigitalOcean | 56,507 |
| AS24940 | Hetzner Online | 55,276 |
| AS16276 | OVHcloud | 36,329 |
| AS214996 | — | 26,430 |
| AS14618 | Amazon AES | 23,321 |
| AS49505 | Selectel Ltd. | 21,336 |
| AS41722 | Miran | 16,903 |
| AS206834 | — | 16,822 |
| AS47583 | Hostinger International | 16,485 |
| AS54113 | Fastly, Inc. | 14,526 |
| AS34762 | Combell | 12,825 |
Tech-Stack Distribution
No Wappalyzer detections
Body-fetcher hasn't covered enough .io sites yet for stack patterns to emerge.
Most-resolved apex domains
Apexes resolving to the most distinct A/AAAA records — popularity proxy.
| Apex | Distinct IPs |
|---|---|
| aixl.io | 2,588 |
| www.enablejavascript.io | 1,347 |
| 192bet0.io | 986 |
| code.gitea.io | 824 |
| 98e.io | 753 |
| 6ss.io | 750 |
| staging.keen.io | 671 |
| 8pus.io | 663 |
| zproxy.lum-superproxy.io | 634 |
| agar.io | 589 |
| ik.imagekit.io | 467 |
| air360.io | 446 |
| restream.io | 429 |
| gitea.io | 403 |
| meltwater.io | 386 |
| cdn.trustindex.io | 330 |
| canny.io | 323 |
| docs.gitea.io | 300 |
| cdn.pagesense.io | 297 |
| noenv.io | 283 |
| 389win.io | 280 |
| cdn.raygun.io | 249 |
| justrelate.io | 248 |
| beefree.io | 245 |
| www.linearity.io | 237 |
Threat-intel hits
| Feed | Category | Domains |
|---|---|---|
| openphish | phishing | 1,587 |
ℹ Coverage will improve significantly once CZDS zone-file access is granted for this TLD.