Roblox User Lookup (User ID and Username)

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roblox past usernames

Roblox past usernames: how to see the history

Look up the account and click Show past usernames. The history comes from a public Roblox route that takes the User ID, so the tool resolves a name to an ID first when needed.

What the route returns and why it is slow

The route is GET users.roblox.com/v1/users/{id}/username-history. The tool asks for the 50 most recent names in descending order and shows what comes back, and the response signals through a cursor when more pages exist, in which case a notice says older names exist. An account that never changed its name comes back with an empty list, and that is the majority case: builderman (ID 156) and ID 261, for example, answer with an empty data array.
The limit is the detail that surprises most. On 2026-10-18 the route headers advertised x-ratelimit-limit "1, 1;w=60": a single call per 60-second window for each IP, and a second call inside the window gets 429 with a retry-after of 5 s even though the window only reopens about 50 s later. Since the IP is our server's, the quota is shared among all visitors. The tool handles this with a per-route cooldown, returns the wait time in the message and keeps each history it got for 1 hour.
An ID that does not exist answers with a 404 error and the message "The user id is invalid.", and the tool shows that there is no account nor history. Names appear as chips in the returned order. They help recognize a player who changed names, but they do not prove identity: anyone can register an old name once it is free, so always confirm by User ID.

Real route answers (2026-10-18)

Account with no changes

Input: 156
Expected output: data: []

The tool shows "No past usernames".

Another account with no changes

Input: 261
Expected output: data: []

Response: data equal to [].

Nonexistent ID

Input: 1000
Expected output: HTTP 404

Message "The user id is invalid.", shown as account not found.

Second call in under 1 minute

Input: 156, depois 1 / 156, then 1
Expected output: HTTP 429

The tool shows the time to try again.

Full tool FAQ

How do I find someone's User ID on Roblox?

Type the username in the Lookup tab. The ID shows up large, with a copy button. On the website the same number is in the profile address: roblox.com/users/156/profile is the account with ID 156 (builderman). You can also paste that whole link here and the tool extracts the ID.

Does the User ID change when someone changes their username?

What is the difference between a username and a display name?

How do I know if a username is available?

Why does a name show as in use when the account is gone in the app?

How do I see an account's past usernames?

How many usernames or IDs can I convert at once?

How do I convert a username to an ID inside a Luau script?

Why are friends, followers or following sometimes blank?

Does the tool store data or access private information?

Frequently asked questions

Why does it say "try again in N seconds"?

Because someone else, or you, already used the single past-username query of the 1-minute window. Wait the time shown and click Try again. Profiles already looked up in the last hour come from the cache without spending the quota.

Can I see the history of several users at once?

No, and it is because of the 1-per-minute limit on the Roblox route, which has no batch version. What Batch mode converts in bulk are names and IDs.

Does the list include names of deleted or banned accounts?

We could not confirm the behavior for banned or terminated accounts, because the route answers case by case. If the history comes back empty or with an error for an account you know changed names, treat it as unconfirmed.

Next steps

What the route returns and why it is slow

Code	Meaning
0	Available to register Roblox accepted this name in the sign-up check.
1	Already in use An account with this name exists. Usernames are unique and not case sensitive.
2	Rejected by moderation Roblox's content filter blocked this name as inappropriate for the platform.
3	Invalid length The name must be 3 to 20 characters long.
4	Underscore at the start or end The name cannot start or end with _.
5	Too many underscores The name can have at most one _.
6	Contains spaces Spaces are not allowed. Use an underscore instead.
7	Characters not allowed Only letters A to Z (no accents), digits 0 to 9 and one underscore are valid.
10	Looks like personal information Roblox's documentation describes this code as a name that contains personal data, such as a phone number or email.
12	Reserved name Roblox's documentation describes this code as a name reserved by the platform.

The route is GET users.roblox.com/v1/users/{id}/username-history. The tool asks for the 50 most recent names in descending order and shows what comes back, and the response signals through a cursor when more pages exist, in which case a notice says older names exist. An account that never changed its name comes back with an empty list, and that is the majority case: builderman (ID 156) and ID 261, for example, answer with an empty data array.

The limit is the detail that surprises most. On 2026-10-18 the route headers advertised x-ratelimit-limit "1, 1;w=60": a single call per 60-second window for each IP, and a second call inside the window gets 429 with a retry-after of 5 s even though the window only reopens about 50 s later. Since the IP is our server's, the quota is shared among all visitors. The tool handles this with a per-route cooldown, returns the wait time in the message and keeps each history it got for 1 hour.

An ID that does not exist answers with a 404 error and the message "The user id is invalid.", and the tool shows that there is no account nor history. Names appear as chips in the returned order. They help recognize a player who changed names, but they do not prove identity: anyone can register an old name once it is free, so always confirm by User ID.

Real route answers (2026-10-18)

Account with no changes

Input: 156
Expected output: data: []

The tool shows "No past usernames".

Another account with no changes

Input: 261
Expected output: data: []

Response: data equal to [].

Nonexistent ID

Input: 1000
Expected output: HTTP 404

Message "The user id is invalid.", shown as account not found.

Second call in under 1 minute

Input: 156, depois 1 / 156, then 1
Expected output: HTTP 429

The tool shows the time to try again.

Full tool FAQ

How do I find someone's User ID on Roblox?

Does the User ID change when someone changes their username?

What is the difference between a username and a display name?

How do I know if a username is available?

Why does a name show as in use when the account is gone in the app?

How do I see an account's past usernames?

How many usernames or IDs can I convert at once?

How do I convert a username to an ID inside a Luau script?

Why are friends, followers or following sometimes blank?

Does the tool store data or access private information?

Frequently asked questions

Why does it say "try again in N seconds"?

Can I see the history of several users at once?

No, and it is because of the 1-per-minute limit on the Roblox route, which has no batch version. What Batch mode converts in bulk are names and IDs.