There are exactly 65,598,336 possible 5-character domain names — sixty-five million five hundred ninety-eight thousand three hundred thirty-six. About as many possible domains as there are books that have ever been published in all of human history. A vast-sounding number, but one that popular TLDs are steadily filling.
Using letters only (a–z), there are 11,881,376 possible domains. Roughly the number of distinct articles on English Wikipedia. A large collection, but entirely countable — and heavily claimed in top TLDs.
Allowing both letters and digits (a–z, 0–9) creates 60,466,176 combinations. If each combination were a page, you could fill a library with over 120,000 five-hundred-page books. This is the last length where popular TLDs face real saturation pressure.
Here's how saturated each TLD is at this length.
million valid combinations
all valid 5-character domain labels (a–z, 0–9, hyphens)
| # | TLD | Registered | % Full (Alpha) |
|---|---|---|---|
| 1 | .com | 2,233,774 | 18.8% |
Five-character domains sit in a sweet spot between scarcity and availability. With 11,881,376 possible alphabetic combinations, the namespace is large enough that opportunities exist in many TLDs, yet small enough that popular extensions are heavily saturated.
At this length, many real English words, brand names, and dictionary terms are possible. The mix of registered domains typically includes common words, abbreviations, and brandable 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)
265 = 11,881,376
Only the 26 lowercase letters. The simplest calculation — each position has 26 choices, so 5 positions gives 265.
Alphanumeric (a–z, 0–9)
365 = 60,466,176
Letters plus digits. Each position has 36 choices. Domain names are case-insensitive, so uppercase and lowercase are equivalent.
All Valid Labels
65,598,336 total
Includes hyphens, but with restrictions. The total is not simply 375 because hyphens have placement rules.
| Character Set | Characters | Formula | 5-Char Combinations |
|---|---|---|---|
| Alphabetic | a–z (26) | 265 | 11,881,376 |
| Alphanumeric | a–z, 0–9 (36) | 365 | 60,466,176 |
| All Valid Labels |
million alphabetic
265 using a–z
million alphanumeric
365 with digits 0–9
saturation
across 50 TLDs
.com registered
18.8% of total
| 2 | .top | 1,680,911 | 14.2% |
| 3 | .net | 562,655 | 4.7% |
| 4 | .org | 502,626 | 4.2% |
| 5 | .vip | 293,693 | 2.5% |
| 6 | .info | 293,074 | 2.5% |
| 7 | .xyz | 276,137 | 2.3% |
| 8 | .shop | 254,339 | 2.1% |
| 9 | .app | 114,685 | 0.97% |
| 10 | .online | 107,051 | 0.90% |
| 11 | .bond | 103,916 | 0.87% |
| 12 | .ch | 92,209 | 0.78% |
| 13 | .sbs | 85,934 | 0.72% |
| 14 | .pro | 83,306 | 0.70% |
| 15 | .store | 77,836 | 0.66% |
| 16 | .site | 77,828 | 0.66% |
| 17 | .biz | 76,643 | 0.65% |
| 18 | .se | 63,580 | 0.54% |
| 19 | .lol | 47,566 | 0.40% |
| 20 | .dev | 44,889 | 0.38% |
| 21 | .tech | 43,491 | 0.37% |
| 22 | .mobi | 41,866 | 0.35% |
| 23 | .club | 40,904 | 0.34% |
| 24 | .cloud | 37,976 | 0.32% |
| 25 | .cyou | 34,874 | 0.29% |
| 26 | .icu | 34,097 | 0.29% |
| 27 | .asia | 32,585 | 0.27% |
| 28 | .space | 29,530 | 0.25% |
| 29 | .link | 28,279 | 0.24% |
| 30 | .click | 28,277 | 0.24% |
| 31 | .live | 27,523 | 0.23% |
| 32 | .one | 27,393 | 0.23% |
| 33 | .loan | 26,594 | 0.22% |
| 34 | .cfd | 24,392 | 0.21% |
| 35 | .blog | 23,234 | 0.20% |
| 36 | .life | 23,090 | 0.19% |
| 37 | .work | 21,560 | 0.18% |
| 38 | .world | 19,180 | 0.16% |
| 39 | .qpon | 18,491 | 0.16% |
| 40 | .art | 14,745 | 0.12% |
| 41 | .fun | 14,484 | 0.12% |
| 42 | .studio | 13,922 | 0.12% |
| 43 | .bet | 13,214 | 0.11% |
| 44 | .nu | 12,933 | 0.11% |
| 45 | .website | 10,989 | 0.09% |
| 46 | .win | 10,690 | 0.09% |
| 47 | .buzz | 10,048 | 0.08% |
| 48 | .digital | 9,889 | 0.08% |
| 49 | .bid | 9,758 | 0.08% |
| 50 | .today | 9,430 | 0.08% |
| a–z, 0–9, hyphen (37) |
| With placement rules |
| 65,598,336 |
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 × 37^3 × 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.