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Flag io.png
Country: British Indian Ocean Territory
Continent: Asia
Capital: Diego Garcia
Location: -7°37'S 72°29'E

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IDN capable: Yes
Handle Updates: No
Registration Period: 1-10 years
Autorenew Grace Period: 35 days
Deletion Timeframe: 35 days after expiration date
Registration System: Realtime
WHOIS-Update: Real-time
WHOIS-Privacy: Yes
Registry: Registry
Dispute Policy: Policy


Zone Info

.IO is the official country code Top-Level-Domain (ccTLD) of The British Indian Ocean Territory.

Zone Use

Anybody can register a domain in this TLD.


  • Minimum: 3
  • Maximum: 63
  • Letters and numbers
  • Hyphens ("-"), however not at the beginning or directly in front of the TLD

IDN Info

The IO-IDN-Policy.pdf with available IDN languages can be downloaded here

Domain Registration

.IO domains can be registered online thorugh webinterface or API.

command         = AddDomain
domain          =
ownercontact0   = [owner handle]
admincontact0   = [admin contact]
techcontact0    = [tech contact]
billingcontact0 = [billing contact]
nameserver0     = [nameserver1]
nameserver1     = [nameserver2]

These registries are also enforcing its policies to include reseller contact data in billing contact handles used for .IO, .SH, .AC, and .TM domains. Previously the registrar data was inserted in the billing contact handle. We lifted this technical restriction. As of now, contact information for billing contact handles used for .IO, .SH, .AC, and .TM domains can be inserted and will be shown in whois. We will not change any contact handle data for existing .IO domains, but we advise to change the billing contact information accordingly to comply with the registry policy.

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Domain Modification


Registrant changes for .IO domains can be done online via api or webinterface.

command       = ModifyDomain
domain        =
ownercontact0 = [new owner handle]

Domain Renewal

.IO domains can be renewed through the webinterface or with the corresponding API command.

command    = RenewDomain
domain     =
period     = [renew period]
expiration = [current year of expiration]

Deletion Process

.IO Domains can be deleted through the API or WebInterface.

command = DeleteDomain
domain  =


  • Most of the registrations are performed in near realtime. However, special domain names such as weird iDNs or abusive names will require manual approval by the registry
  • Min./Max nameservers 1-13
  • TLD does not support status clientTransferProhibited.


.IO Domain Transfers are possible. Upon successfully transferring a domain, it is automatically renewed for one year. The registration period is extended by one year.

Transfer procedure

.IO Transfers can either be done through the RRPproxy WebInterface or API.

command = TransferDomain
domain  =
auth    = ...

Transfer notes

  • A .IO Domain Transfer must be initiated with a so-called Authorisation Code, which can be obtained from the current registrar through the owner or Admin-C of the domain.
  • Ensure that your respective domain does not have a lock-status (REGISTRAR-LOCK or HOLD). This can be seen in the WHOIS.
    If the domain is locked, then the owner can demand that the domain will be unlocked.


Restores are generally possible. A restore can be requested via API command or via webinterface.

command = restoredomain
domain  =

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