# Bucket Naming Rules

In Tigris, buckets are global, each requiring a unique name. In addition, there are specific rules that must be followed when creating a bucket. Let's review these rules below.

## Rules[​](#rules "Direct link to Rules")

The following naming rules apply for buckets.

* Bucket name must be between \[3, 63] characters

* Bucket name can only contain lowercase characters, numbers, dots, and hyphens.

  info

  Using a dot (.) will disable virtual-hosted style access (e.g., `https://foo.bucket.t3.storage.dev`) for a bucket. However, you can still access it through a correctly configured [custom domain](/docs/buckets/custom-domain/.md).

* Bucket names must not contain two adjacent periods

* Name must start with a number or a lowercase character

* Name must end with a number or a lowercase character

* Prefix `xn--` is reserved and not allowed in the bucket prefix

* Suffix `-s3alias` is reserved and not allowed in the bucket suffix

* Bucket name cannot be IP addresses

## Example bucket names[​](#example-bucket-names "Direct link to Example bucket names")

The following bucket names show examples of which characters are allowed in bucket names: `a-z, 0-9, dots (.), and hyphens (-)`.

```
tigris-demo-bucket1-a1b2c3d4-5678-90ab-cdef-example11111

tigris-demo-bucket

example.com

www.example.com

my.example.tigris.bucket
```

The following example bucket names are not valid:

```
tigris_demo_bucket (contains underscores)

TigrisDemoBucket (contains uppercase letters)

tigris-demo-bucket- (ends with a hyphen)

example..com (contains two adjacent periods)

192.168.5.4 (matches format of an IP address)

xn--examplebucket (starts with reserved prefix)

examplebucket-s3alias (ends with reserved suffix)
```