Top-Level Domain
.io
Aggregated statistics for the top-level domain
Apex domains
769,331
we've enumerated
Subdomains seen
12,781,286
CT + DNS + brute
TLS certs
96,549
naming .io
Hosting ASNs
15
distinct origins
Domain Distribution
Apex domains with the most known subdomains — large orgs, telecoms, hosters.
| Apex | Subdomains |
|---|---|
| azurecontainerapps.io | 4,866,920 |
| keenetic.io | 2,153,866 |
| netcraze.io | 730,889 |
| nip.io | 452,755 |
| sslip.io | 393,344 |
| azurecontainerapps-test.io | 260,017 |
| k4apps.io | 253,814 |
| nid.io | 118,143 |
| starsweb.io | 75,059 |
| tktl.io | 65,342 |
| qzz.io | 63,362 |
| instruqt.io | 36,996 |
| nxcli.io | 32,155 |
| cloudhub.io | 24,213 |
| streamgpu.io | 20,900 |
| jsdelivr.io | 19,471 |
| isccloud.io | 17,545 |
| aroapp-hcp.io | 17,256 |
| aroapp.io | 15,622 |
| redhatworkshops.io | 14,954 |
| azmk8s.io | 10,862 |
| tmachine.io | 10,712 |
| sfmc.io | 10,320 |
| cedevice.io | 10,306 |
| wiz.io | 7,956 |
| upli.io | 7,855 |
| ikarem.io | 7,845 |
| cs-ide.io | 7,386 |
| galaxy-dev.io | 7,178 |
| icore.io | 6,809 |
| cxnpl.io | 6,676 |
| affiliatereel.io | 6,391 |
| sapcloud.io | 5,440 |
| zuddl.io | 5,434 |
| fluffy-otter-5.telebit.io | 5,299 |
| pegcloud.io | 5,081 |
| backname.io | 5,013 |
| cwan.io | 4,917 |
| amazee.io | 4,841 |
| wdr.io | 4,818 |
| lumar.io | 4,803 |
| enablon.io | 4,768 |
| serious-cat-33.telebit.io | 4,670 |
| litegallery.io | 4,629 |
| azgrafana.io | 4,610 |
| sehlat.io | 4,585 |
| cloudezapp.io | 4,488 |
| hotelengine.io | 4,388 |
| gigantic.io | 4,361 |
| enotis.io | 4,251 |
Top Certificate Issuers
| Issuer (CA) | Certs |
|---|---|
| Amazon | 29,848 |
| Let's Encrypt | 25,087 |
| ca | 10,717 |
| WR3 | 6,518 |
| YR1 | 2,917 |
| YE2 | 2,861 |
| YR2 | 2,754 |
| YE1 | 2,712 |
| Sectigo | 1,844 |
| RunCloud WebSSL Root CA | 1,778 |
| DigiCert | 1,505 |
| Cloudflare | 1,418 |
| GoDaddy | 783 |
| ZeroSSL | 520 |
| GlobalSign | 411 |
Top Hosting ASNs
| ASN | Name | .io domains |
|---|---|---|
| AS16509 | Amazon.com | 403,396 |
| AS8075 | Microsoft | 376,699 |
| AS49505 | Selectel Ltd. | 180,834 |
| AS13335 | Cloudflare | 161,316 |
| AS41722 | Miran | 144,578 |
| AS396982 | Google Cloud | 106,972 |
| AS14061 | DigitalOcean | 67,879 |
| AS24940 | Hetzner Online | 67,032 |
| AS50340 | Selectel MSK | 56,722 |
| AS16276 | OVHcloud | 43,035 |
| AS214996 | — | 29,826 |
| AS14618 | Amazon AES | 26,599 |
| AS47583 | Hostinger International | 21,326 |
| AS206834 | — | 20,870 |
| AS54113 | Fastly, Inc. | 16,859 |
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 | 1,616 |
| 192bet0.io | 986 |
| code.gitea.io | 844 |
| 98e.io | 757 |
| zproxy.lum-superproxy.io | 754 |
| 6ss.io | 750 |
| staging.keen.io | 671 |
| 8pus.io | 663 |
| agar.io | 589 |
| ik.imagekit.io | 493 |
| air360.io | 446 |
| restream.io | 433 |
| gitea.io | 407 |
| meltwater.io | 386 |
| canny.io | 347 |
| cdn.trustindex.io | 330 |
| docs.gitea.io | 308 |
| cdn.pagesense.io | 301 |
| noenv.io | 283 |
| 389win.io | 280 |
| www.8196.io | 270 |
| justrelate.io | 251 |
| beefree.io | 249 |
| cdn.raygun.io | 249 |
Threat-intel hits
| Feed | Category | Domains |
|---|---|---|
| openphish | phishing | 1,920 |
ℹ Coverage will improve significantly once CZDS zone-file access is granted for this TLD.