There are exactly 36 possible 1-character domain names — thirty-six. That is fewer domain names than keys on a standard computer keyboard. Every single one is a prized digital asset.
Using letters only (a–z), there are 26 possible domains. Exactly one domain for each letter of the English alphabet — the most exclusive class of domain names in existence.
Allowing both letters and digits (a–z, 0–9) creates 36 combinations. Adding digits 0 through 9 brings the total to just 36 — still fewer than the number of playing cards in a poker deck.
Here's how saturated each TLD is at this length.
all valid 1-character domain labels (a–z, 0–9, hyphens)
| # | TLD | Registered | % Full (Alpha) |
|---|---|---|---|
| 1 | .name | 237 | >99.9% |
One-character domain names are among the most coveted in the domain industry. With only 26 possible alphabetic combinations, they represent an extremely finite resource. In popular TLDs like .com and .net, virtually all 1-character names are registered — making them valuable in the aftermarket.
The scarcity of 1-character domains makes them popular for brand names, abbreviations, and premium resale. Many three-letter .com domains sell for five to six figures on aftermarket platforms.
Most major TLDs — including .com, .net, .org, .info, and .biz — do not allow single-character domain registrations. These registries enforce a minimum domain length of 2 or 3 characters, which is why they do not appear in the table above.
The TLDs that do support 1-character domains are primarily newer generic extensions (gTLDs) such as .xyz, .bot, .live, and .online. Even among these, single-character names are extremely scarce — with only 26 possible alphabetic combinations, most are already registered.
If you are looking for an ultra-short domain, consider 2-character names in legacy TLDs or explore the newer gTLDs listed above that support single-character registrations.
Domain name labels (the part before the dot) follow strict character rules defined in RFC 5891 and RFC 1035. DNSChkr calculates three tiers of possible combinations for each domain length:
Alphabetic (a–z)
261 = 26
Only the 26 lowercase letters. The simplest calculation — each position has 26 choices, so 1 positions gives 261.
Alphanumeric (a–z, 0–9)
361 = 36
Letters plus digits. Each position has 36 choices. Domain names are case-insensitive, so uppercase and lowercase are equivalent.
All Valid Labels
36 total
Includes hyphens, but with restrictions. The total is not simply 371 because hyphens have placement rules.
| Character Set | Characters | Formula | 1-Char Combinations |
|---|---|---|---|
| Alphabetic | a–z (26) | 261 | 26 |
| Alphanumeric | a–z, 0–9 (36) | 361 | 36 |
| All Valid Labels | a–z, 0–9, hyphen (37) |
alphabetic
261 using a–z
alphanumeric
361 with digits 0–9
saturation
across 50 TLDs
.name registered
>99.9% of total
| 2 | .nu | 35 | >99.9% |
| 3 | .vip | 33 | >99.9% |
| 4 | .biz | 28 | >99.9% |
| 5 | .club | 27 | >99.9% |
| 6 | .live | 27 | >99.9% |
| 7 | .world | 26 | >99.9% |
| 8 | .digital | 25 | 96.2% |
| 9 | .run | 25 | 96.2% |
| 10 | .app | 25 | 96.2% |
| 11 | .network | 24 | 92.3% |
| 12 | .org | 23 | 88.5% |
| 13 | .today | 23 | 88.5% |
| 14 | .fyi | 22 | 84.6% |
| 15 | .global | 22 | 84.6% |
| 16 | .beer | 22 | 84.6% |
| 17 | .work | 21 | 80.8% |
| 18 | .bet | 20 | 76.9% |
| 19 | .bot | 20 | 76.9% |
| 20 | .studio | 20 | 76.9% |
| 21 | .info | 19 | 73.1% |
| 22 | .pro | 19 | 73.1% |
| 23 | .fit | 18 | 69.2% |
| 24 | .asia | 18 | 69.2% |
| 25 | .top | 18 | 69.2% |
| 26 | .works | 17 | 65.4% |
| 27 | .finance | 16 | 61.5% |
| 28 | .life | 16 | 61.5% |
| 29 | .xyz | 16 | 61.5% |
| 30 | .group | 15 | 57.7% |
| 31 | .house | 15 | 57.7% |
| 32 | .lol | 15 | 57.7% |
| 33 | .ltd | 15 | 57.7% |
| 34 | .systems | 15 | 57.7% |
| 35 | .company | 14 | 53.9% |
| 36 | .contact | 14 | 53.9% |
| 37 | 14 | 53.9% |
| 38 | .agency | 14 | 53.9% |
| 39 | .center | 14 | 53.9% |
| 40 | .social | 14 | 53.9% |
| 41 | .media | 13 | 50.0% |
| 42 | .se | 13 | 50.0% |
| 43 | .solutions | 13 | 50.0% |
| 44 | .wine | 13 | 50.0% |
| 45 | .claims | 12 | 46.1% |
| 46 | .cool | 12 | 46.1% |
| 47 | .education | 12 | 46.1% |
| 48 | .exchange | 12 | 46.1% |
| 49 | .help | 12 | 46.1% |
| 50 | .capital | 12 | 46.1% |
| With placement rules |
| 36 |
Hyphen Placement Rules
xn--example are reserved for internationalized domain names (IDN) under RFC 5891 §4.2.3.1. A hyphen in position 3 and position 4 simultaneously is not permitted in standard registrations.These constraints mean at 1 character, the double-hyphen rule at positions 3–4 does not apply (the label is too short). All three counts are mathematical constants that never change — only the number of registered domains (shown in the table above) changes daily.