There are exactly 89,804,121,984 possible 7-character domain names — eighty-nine billion eight hundred four million one hundred twenty-one thousand nine hundred eighty-four. More possible domains than the estimated number of stars visible from Earth with the most powerful telescopes. At seven characters, the namespace dwarfs anything humans could exhaust in a lifetime.
Using letters only (a–z), there are 8,031,810,176 possible domains. Just over eight billion — roughly one possible domain for every person alive on Earth. The namespace has reached human-population scale.
Allowing both letters and digits (a–z, 0–9) creates 78,364,164,096 combinations. Nearly ten possible domains for every human being. Even the most popular TLDs have enormous availability at this length.
Here's how saturated each TLD is at this length.
billion valid combinations
all valid 7-character domain labels (a–z, 0–9, hyphens)
| # | TLD | Registered | % Full (Alpha) |
|---|---|---|---|
| 1 | .com | 4,923,808 | 0.06% |
At 7 characters, the domain namespace becomes vast — 8,031,810,176 possible alphabetic combinations. Even the most popular TLDs have significant availability at this length. The challenge shifts from scarcity to finding memorable, meaningful names.
Longer domains are often full words or multi-word combinations. While they lack the premium cachet of short domains, they offer excellent opportunities for keyword-rich, descriptive domain names.
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)
267 = 8,031,810,176
Only the 26 lowercase letters. The simplest calculation — each position has 26 choices, so 7 positions gives 267.
Alphanumeric (a–z, 0–9)
367 = 78,364,164,096
Letters plus digits. Each position has 36 choices. Domain names are case-insensitive, so uppercase and lowercase are equivalent.
All Valid Labels
89,804,121,984 total
Includes hyphens, but with restrictions. The total is not simply 377 because hyphens have placement rules.
| Character Set | Characters | Formula | 7-Char Combinations |
|---|---|---|---|
| Alphabetic | a–z (26) | 267 | 8,031,810,176 |
| Alphanumeric | a–z, 0–9 (36) | 367 | 78,364,164,096 |
| All Valid Labels |
billion alphabetic
267 using a–z
billion alphanumeric
367 with digits 0–9
saturation
across 50 TLDs
.com registered
0.06% of total
| 2 | .net | 937,211 | 0.01% |
| 3 | .org | 688,226 | 0.01% |
| 4 | .top | 541,036 | 0.01% |
| 5 | .xyz | 468,928 | 0.01% |
| 6 | .shop | 441,558 | 0.01% |
| 7 | .info | 410,568 | 0.01% |
| 8 | .bond | 287,443 | <0.01% |
| 9 | .sbs | 278,500 | <0.01% |
| 10 | .online | 228,090 | <0.01% |
| 11 | .store | 164,039 | <0.01% |
| 12 | .ch | 162,316 | <0.01% |
| 13 | .vip | 155,635 | <0.01% |
| 14 | .site | 143,588 | <0.01% |
| 15 | .app | 123,690 | <0.01% |
| 16 | .se | 110,388 | <0.01% |
| 17 | .pro | 102,603 | <0.01% |
| 18 | .biz | 82,693 | <0.01% |
| 19 | .dev | 57,509 | <0.01% |
| 20 | .autos | 56,478 | <0.01% |
| 21 | .tech | 56,128 | <0.01% |
| 22 | .cloud | 52,795 | <0.01% |
| 23 | .space | 52,406 | <0.01% |
| 24 | .cfd | 50,559 | <0.01% |
| 25 | .asia | 47,414 | <0.01% |
| 26 | .live | 43,815 | <0.01% |
| 27 | .club | 43,015 | <0.01% |
| 28 | .click | 41,087 | <0.01% |
| 29 | .yachts | 31,531 | <0.01% |
| 30 | .life | 30,677 | <0.01% |
| 31 | .world | 28,588 | <0.01% |
| 32 | .icu | 24,162 | <0.01% |
| 33 | .buzz | 23,623 | <0.01% |
| 34 | .work | 21,895 | <0.01% |
| 35 | .cyou | 21,434 | <0.01% |
| 36 | .art | 21,272 | <0.01% |
| 37 | .mobi | 20,844 | <0.01% |
| 38 | .lol | 19,171 | <0.01% |
| 39 | .fun | 18,719 | <0.01% |
| 40 | .makeup | 17,348 | <0.01% |
| 41 | .nu | 17,183 | <0.01% |
| 42 | .website | 16,659 | <0.01% |
| 43 | .one | 16,219 | <0.01% |
| 44 | .digital | 15,286 | <0.01% |
| 45 | .blog | 14,927 | <0.01% |
| 46 | .studio | 14,056 | <0.01% |
| 47 | .beer | 13,768 | <0.01% |
| 48 | .bet | 11,547 | <0.01% |
| 49 | .link | 11,369 | <0.01% |
| 50 | .solutions | 8,246 | <0.01% |
| a–z, 0–9, hyphen (37) |
| With placement rules |
| 89,804,121,984 |
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 the "all valid" count is less than a simple 36 × 37^5 × 36 calculation — the double-hyphen exclusion at positions 3–4 removes a subset of otherwise valid combinations. All three counts are mathematical constants that never change — only the number of registered domains (shown in the table above) changes daily.