Top-Level Domain
.io
Aggregated statistics for the top-level domain
Apex domains
—
we've enumerated
Subdomains seen
—
CT + DNS + brute
TLS certs
81,460
naming .io
Hosting ASNs
—
distinct origins
Domain Distribution
No apex enumerations
No subdomain discoveries yet for .io. Our CT-log + DNS-brute crawlers populate this as they pick up domains.
Top Certificate Issuers
| Issuer (CA) | Certs |
|---|---|
| Amazon | 29,648 |
| Let's Encrypt | 24,215 |
| WR3 | 5,068 |
| ca | 4,270 |
| YR1 | 1,826 |
| YR2 | 1,748 |
| YE2 | 1,669 |
| Sectigo | 1,661 |
| YE1 | 1,563 |
| RunCloud WebSSL Root CA | 1,558 |
| DigiCert | 1,351 |
| Cloudflare | 1,210 |
| GoDaddy | 697 |
| ZeroSSL | 423 |
| GlobalSign | 357 |
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 | 1,579 |
ℹ Coverage will improve significantly once CZDS zone-file access is granted for this TLD.