Yes. A domain name can start with a number. Modern hostname rules allow a label to begin with either a letter or a digit, so names such as 7example.com are technically valid. The bigger question is whether a numbered domain is clear enough for people to remember and type correctly.
Quick answer
The technical rules allow it, including for common extensions such as .com and for .uk domains. Whether it is a good choice depends more on branding, clarity and how easily someone can say and type the name.
If you have found an available domain beginning with a digit, there is no general DNS rule saying you must change it to a word. The old restriction that host names had to start with a letter was relaxed decades ago.
RFC 1123, an Internet Standard published in 1989, explicitly changed the first-character rule so that a host name could begin with either a letter or a digit. ICANN also describes ordinary ASCII domain labels as using letters, digits and hyphens.
The harder decision is whether people will understand the number when they hear your domain. A technically valid domain can still be a poor brand if you constantly have to explain whether the number is written as a digit or as a word.
Yes. Under the modern Internet hostname rules, the first character can be a letter or a digit.
The clearest source is RFC 1123. It changed the older hostname syntax and states that the first character may be either a letter or a digit.
That means domains such as 7example.com, 24hours.net or 3things.org can be valid from a hostname-syntax point of view. A label can even be entirely numeric, although the rules of the particular registry still apply.
For normal ASCII domains, ICANN describes the familiar character set as letters, digits and hyphens. Hyphens are more restricted: they are not generally allowed at the beginning or end of an ordinary hostname label.
Starts with a digit. This is allowed under the modern hostname rules.
Begins with two digits followed by letters. This is also technically valid.
An all-numeric second-level label can be valid, subject to the registry’s own rules.
A leading hyphen is not valid under the ordinary hostname rules.
A label should not end with a hyphen either.
Numbers can also appear at the end or in the middle of a domain label.
Many do, but the registry running each extension can impose extra registration rules, so it is worth checking the specific TLD before relying on a name.
Common generic extensions such as .com use the standard domain-name character rules, so a number at the start is not a problem in itself. If you are comparing an available name across extensions, our .com price comparison is a useful place to check current registrar pricing.
The same basic idea applies in the UK. Nominet says .uk domain names may contain the letters a-z, numbers 0-9 and hyphens, and that a domain cannot begin or end with a hyphen. A leading number is therefore permitted under the current .uk naming rules. You can compare .co.uk registration prices if that is the extension you are considering.
Where I would be careful is with less familiar country-code or specialist extensions. Registry policies can differ, and some namespaces have eligibility or naming rules that go beyond the basic DNS syntax.
The DNS can support a label beginning with a digit, but the registry for a particular extension can still apply its own policy restrictions. Check the extension’s current rules before building a brand around the domain.
Sometimes. I would judge it on how naturally the number belongs in the name, not on the fact that it is a number.
A number can work very well when it is already part of the brand, a recognised phrase, a year, a model number or something customers naturally expect to see as digits.
The problem starts when people have to guess. If you say the domain aloud and someone has to ask, “Is that 4 or four?”, you have created a small bit of friction every time the name is shared by phone, radio, podcast or word of mouth.
I also avoid choosing a numbered version simply because the cleaner word-only domain has gone. A domain such as 4greatdeals.example may be technically fine, but if the number is only there as a workaround it can make the address feel harder to trust or remember.
If customers already know the business with the digit in its name, matching that form can make the domain easier to recognise.
Numbers such as 24, 365 or a meaningful year can make sense when the connection is immediate rather than forced.
A strong domain should be easy to repeat without having to explain whether the number is a digit or a word.
Using 2 for “to”, 4 for “for” or 8 for “ate” can create unnecessary typing and spelling confusion.
Not automatically. A clear, established brand can look perfectly natural with a leading number. What tends to look weaker is a random digit added solely because the preferred domain was unavailable.
If you are still deciding between several names, it is worth checking the actual registration and renewal costs rather than picking a compromise domain just because it appears cheap in year one. Our domain registration comparison is designed for that.
Managing a portfolio of more than 300 domains has made me much less interested in clever-looking names and much more interested in names people can actually use without explanation.
I would not reject a domain simply because it starts with a number. My first test is whether I can say the full domain once and reasonably expect someone to type the right thing.
If I have to follow it with “that is the number 4, not the word four”, I normally see that as a warning. It does not make the domain unusable, but it means the brand is carrying a small communication problem from day one.
I would be much happier using a leading number where the numeric form is the obvious form of the brand. In that situation the digit can actually make the domain shorter and more memorable.
If the leading number makes immediate sense, I am comfortable with it. If it exists only because the better domain was unavailable, I would usually keep looking.
In brief
The technical rules allow it, and .uk domains can start with a digit too. I would make the decision on clarity: if the number belongs naturally in the brand and people can type the domain without asking questions, there is no reason to avoid it just because the first character is numeric.
