Top-Level Domain
.io
Aggregated statistics for the top-level domain
Apex domains
—
we've enumerated
Subdomains seen
—
CT + DNS + brute
TLS certs
85,187
naming .io
Hosting ASNs
15
distinct origins
Domain Distribution
Apex domains with the most known subdomains — large orgs, telecoms, hosters.
| Apex | Subdomains |
|---|---|
| azurecontainerapps.io | 3,499,284 |
| keenetic.io | 1,890,363 |
| nip.io | 349,848 |
| sslip.io | 287,274 |
| azurecontainerapps-test.io | 189,590 |
| k4apps.io | 176,590 |
| nid.io | 118,143 |
| netcraze.io | 117,554 |
| starsweb.io | 74,294 |
| tktl.io | 64,820 |
| qzz.io | 54,420 |
| instruqt.io | 31,342 |
| nxcli.io | 27,750 |
| cloudhub.io | 22,828 |
| jsdelivr.io | 19,471 |
| aroapp-hcp.io | 13,925 |
| redhatworkshops.io | 12,937 |
| streamgpu.io | 12,475 |
| aroapp.io | 11,890 |
| cedevice.io | 10,176 |
| isccloud.io | 9,150 |
| tmachine.io | 8,804 |
| sfmc.io | 8,298 |
| wiz.io | 8,003 |
| upli.io | 7,596 |
| ikarem.io | 7,515 |
| icore.io | 6,995 |
| cxnpl.io | 6,592 |
| affiliatereel.io | 6,127 |
| azmk8s.io | 5,982 |
| galaxy-dev.io | 5,609 |
| cs-ide.io | 5,441 |
| fluffy-otter-5.telebit.io | 4,950 |
| cwan.io | 4,898 |
| sapcloud.io | 4,877 |
| lumar.io | 4,792 |
| backname.io | 4,742 |
| enablon.io | 4,698 |
| serious-cat-33.telebit.io | 4,561 |
| pegcloud.io | 4,552 |
| hotelengine.io | 4,383 |
| ordinary-elephant-58.telebit.io | 4,379 |
| zuddl.io | 4,371 |
| litegallery.io | 4,324 |
| wdr.io | 4,268 |
| gigantic.io | 4,266 |
| amazee.io | 3,999 |
| wet-crab-48.telebit.io | 3,972 |
| enotis.io | 3,960 |
| dishcloud.io | 3,949 |
Top Certificate Issuers
| Issuer (CA) | Certs |
|---|---|
| Amazon | 29,689 |
| Let's Encrypt | 24,449 |
| ca | 5,864 |
| WR3 | 5,414 |
| YR1 | 2,085 |
| YR2 | 2,008 |
| YE2 | 1,959 |
| YE1 | 1,861 |
| Sectigo | 1,707 |
| RunCloud WebSSL Root CA | 1,602 |
| DigiCert | 1,386 |
| Cloudflare | 1,262 |
| GoDaddy | 729 |
| ZeroSSL | 449 |
| GlobalSign | 374 |
Top Hosting ASNs
| ASN | Name | .io domains |
|---|---|---|
| AS16509 | Amazon.com | 363,408 |
| AS8075 | Microsoft | 325,456 |
| AS13335 | Cloudflare | 138,327 |
| AS396982 | Google Cloud | 66,263 |
| AS14061 | DigitalOcean | 58,153 |
| AS24940 | Hetzner Online | 57,464 |
| AS16276 | OVHcloud | 37,787 |
| AS49505 | Selectel Ltd. | 29,536 |
| AS214996 | — | 28,321 |
| AS14618 | Amazon AES | 24,031 |
| AS41722 | Miran | 23,458 |
| AS47583 | Hostinger International | 17,309 |
| AS206834 | — | 17,077 |
| AS54113 | Fastly, Inc. | 14,915 |
| AS34762 | Combell | 13,361 |
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 | 1,659 |
ℹ Coverage will improve significantly once CZDS zone-file access is granted for this TLD.