.io

.io is a country code top-level domain managed by Internet Computer Bureau Limited.

Registry facts

TLD	`.io`
Type	Country Code
TLD manager	Internet Computer Bureau Limited
IANA status	Active
Script	Latn
RDAP server	None listed in the IANA bootstrap registry (use WHOIS)
IANA record	iana.org/domains/root/db/io

IANA data: TLD list Version 2026111000, Last Updated Tue Nov 10 07:07:01 2026 UTC; RDAP bootstrap published 2026-10-28; Root Zone Database fetched 2026-11-11.

206.io domains measuredof 9,971 in the sample

13.1%signed with DNSSEC

46.1%enforce DMARC

65.7%send HSTSof those answering on HTTPS

.io domains compared with the whole sample

Accent bars: 206 .io domains. Grey bars: all 9,971 measured domains.

DNSSEC signed 13.1%

all measured 10.6%

SPF record 68.4%

all measured 75.7%

DMARC record 62.6%

all measured 68.0%

DMARC enforced 46.1%

all measured 50.9%

CAA record 21.8%

all measured 20.7%

MTA-STS 1.9%

all measured 3.0%

TLS 1.3 91.8%

all measured 84.9%

HSTS 65.7%

all measured 56.4%

DNS providers

Amazon Route 53 48.1%

Cloudflare DNS 26.2%

Google Cloud DNS 7.8%

IBM NS1 Connect 1.9%

Azure DNS 1.9%

Gandi LiveDNS 1.5%

Email providers

Google Workspace 42.2%

Amazon SES 7.8%

Microsoft 365 (Exchange Online) 4.9%

Mailgun 2.4%

Zoho Mail 2.4%

Proofpoint 1.9%

Certificate authorities

Let's Encrypt 23.8%

Google Trust Services 23.8%

Amazon Trust Services 13.6%

DigiCert 3.9%

Sectigo 1.9%

GoDaddy / Starfield 1.0%

Popular .io domains in the sample

h264.iosentry.ioadobe.iogithub.ioastrumu.iobranch.iogrammarly.ionetcraze.iopushy.iointercom.ioitch.iotubi.io

Check one yourself:

WHOIS lookup Inspect DNSSEC Check SSL certificate

Other TLDs in the sample

.com · 5078 .net · 785 .org · 434 .ru · 291 .jp · 202 .de · 181 .edu · 125 .gov · 114 .in · 107 .br · 106

Source: our own scan of November 2026 (2026-11-11), 9,971 of the top 10,000 domains of the Tranco list Y895G that answered in DNS. Method and data.