Top-Level Domain
.io
Aggregated statistics for the top-level domain
Apex domains
—
we've enumerated
Subdomains seen
10,392,036
CT + DNS + brute
TLS certs
88,038
naming .io
Hosting ASNs
—
distinct origins
Domain Distribution
Apex domains with the most known subdomains — large orgs, telecoms, hosters.
| Apex | Subdomains |
|---|---|
| azurecontainerapps.io | 3,576,220 |
| keenetic.io | 1,980,019 |
| nip.io | 375,079 |
| netcraze.io | 356,510 |
| sslip.io | 324,643 |
| azurecontainerapps-test.io | 194,021 |
| k4apps.io | 179,804 |
| nid.io | 118,145 |
| starsweb.io | 74,550 |
| tktl.io | 65,070 |
| qzz.io | 58,172 |
| instruqt.io | 32,768 |
| nxcli.io | 29,265 |
| cloudhub.io | 23,490 |
| jsdelivr.io | 19,471 |
| isccloud.io | 17,394 |
| aroapp-hcp.io | 14,271 |
| streamgpu.io | 14,178 |
| redhatworkshops.io | 13,304 |
| aroapp.io | 12,202 |
| cedevice.io | 10,218 |
| tmachine.io | 9,335 |
| sfmc.io | 8,481 |
| wiz.io | 8,053 |
| ikarem.io | 7,672 |
| upli.io | 7,648 |
| azmk8s.io | 7,243 |
| icore.io | 6,998 |
| cxnpl.io | 6,621 |
| affiliatereel.io | 6,169 |
| galaxy-dev.io | 5,968 |
| cs-ide.io | 5,600 |
| fluffy-otter-5.telebit.io | 5,159 |
| sapcloud.io | 5,108 |
| cwan.io | 4,915 |
| serious-cat-33.telebit.io | 4,871 |
| backname.io | 4,802 |
| lumar.io | 4,802 |
| pegcloud.io | 4,727 |
| enablon.io | 4,718 |
| ordinary-elephant-58.telebit.io | 4,700 |
| zuddl.io | 4,693 |
| wdr.io | 4,451 |
| hotelengine.io | 4,383 |
| litegallery.io | 4,368 |
| gigantic.io | 4,305 |
| amazee.io | 4,297 |
| sehlat.io | 4,103 |
| wet-crab-48.telebit.io | 4,088 |
| enotis.io | 4,074 |
Top Certificate Issuers
| Issuer (CA) | Certs |
|---|---|
| Amazon | 29,722 |
| Let's Encrypt | 24,616 |
| ca | 7,120 |
| WR3 | 5,682 |
| YR1 | 2,269 |
| YR2 | 2,196 |
| YE2 | 2,177 |
| YE1 | 2,053 |
| Sectigo | 1,749 |
| RunCloud WebSSL Root CA | 1,649 |
| DigiCert | 1,413 |
| Cloudflare | 1,302 |
| GoDaddy | 744 |
| ZeroSSL | 464 |
| GlobalSign | 385 |
Top Hosting ASNs
No hosting attribution yet
Forward-DNS crawler hasn't resolved enough .io apexes to BGP-attributable IPs.
Tech-Stack Distribution
No Wappalyzer detections
Body-fetcher hasn't covered enough .io sites yet for stack patterns to emerge.
Threat-intel hits
| Feed | Category | Domains |
|---|---|---|
| openphish | phishing | 1,746 |
ℹ Coverage will improve significantly once CZDS zone-file access is granted for this TLD.