Docker Hub username checker and rules

A brand claims its name on Docker Hub as a Docker ID or an organization namespace. Our check looks up both. How our checks work

CostFree for a Docker ID

Name length4 to 30 characters

CharactersLetters and numbers

Can you change it?No, it's permanent

Organizations needTeam, from $15 a user

Checked 25 Oct 2026, 07:27 UTCSources ^{[1, 2, 4]}

What can a Docker Hub username contain?

Letters and numbers only, 4 to 30 characters. Docker stores it in lowercase, and it can't be an email address.

An organization's namespace can't match an existing Docker ID. Docker doesn't publish separate character rules for it.^{[1, 2, 5]}

Check the name above, with GitHub and the .com.
On the sign-up page, choose email, Google or GitHub, then pick your username.
Verify your account. With email, enter the six-digit code Docker sends; Docker blocks sign-in until you do.
For an organization, choose Create new organization in Docker Home, pick a plan and seats, enter the namespace and pay.^{[1, 3]}

A personal Docker ID is free. Organizations come with the Team plan or above.

Plan	Price, billed yearly	Docker Hub includes
Personal	$0	1 private repository
Pro	$9 a month ($11 monthly)	Unlimited pulls
Team	$15 per user a month ($16 monthly)	1 organization, unlimited private repositories
Business	$24 per user a month	Unlimited organizations, through sales

Sources ^[4]

Docker IDs are first come, first served, and you can never change one.

Fact	What it means
Permanent	For a different Docker ID, you need a new account
Never reused	A Docker ID can't be used again after the account is deactivated
Organization namespace	Permanent too; only the display name can change

Sources ^{[2, 5]}

If your company holds a U.S. trademark on it, Docker Support can retrieve the Docker ID for you. Otherwise pick a close version.^[2]

Checks Docker Hub, GitHub, GitLab, Hugging Face, X and the .com in one search.