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DNS Checker(beta)

Four-Character Domain Availability

There are exactly 1,774,224 possible 4-character domain names — one million seven hundred seventy-four thousand two hundred twenty-four. If each valid four-character domain were worth just one dollar, the entire namespace would be valued at less than the price of a modest house in a major city. That is how finite this space is.

Using letters only (a–z), there are 456,976 possible domains. Fewer than half a million letter-only combinations — roughly the number of words in four large novels. In .com, nearly all of them are registered.

Allowing both letters and digits (a–z, 0–9) creates 1,679,616 combinations. If each combination were a penny, the total would not even buy a used car. The namespace is remarkably small at this length.

Here's how saturated each TLD is at this length.

Data updated daily — last snapshot: April 29, 2026
1,774,224 valid domain combinations

million valid combinations

all valid 4-character domain labels (a–z, 0–9, hyphens)

Alphabetic combinations

thousand alphabetic

264 using a–z

Alphanumeric combinations

million alphanumeric

364 with digits 0–9

Average saturation

saturation

across 50 TLDs

Total registered domains

.com registered

>99.9% of total

Which TLDs Are Most Saturated at 4 Characters?

1
Registered1,088,099
Saturation>99.9%
2
Registered508,845
Saturation>99.9%
3
Registered307,876
Saturation67.4%
4
Registered304,990
Saturation66.7%
5
Registered260,223
Saturation56.9%

How Full Is Each TLD at 4 Characters?

#TLDRegistered% Full (Alpha)
1.com1,088,099
>99.9%
2.xyz508,845
>99.9%
3.net307,876
67.4%
4.top304,990
66.7%
5.org260,223
56.9%
6.info108,120
23.7%
7.shop91,732
20.1%
8.vip81,133
17.8%
9.app67,448
14.8%
10.online64,758
14.2%
11.ch63,467
13.9%
12.pro54,517
11.9%
13.site50,031
10.9%
14.dev46,477
10.2%
15.store42,018
9.2%
16.se39,878
8.7%
17.mobi37,760
8.3%
18.biz33,616
7.4%
19.tech30,405
6.7%
20.fun27,723
6.1%
21.cloud27,577
6.0%
22.live26,839
5.9%
23.club25,644
5.6%
24.life23,204
5.1%
25.asia23,044
5.0%
26.one22,153
4.8%
27.space21,115
4.6%
28.icu19,416
4.3%
29.work18,615
4.1%
30.world17,874
3.9%
31.click16,702
3.6%
32.lol15,983
3.5%
33.studio15,110
3.3%
34.bet15,065
3.3%
35.ltd14,899
3.3%
36.group14,293
3.1%
37.link14,095
3.1%
38.digital13,363
2.9%
39.win11,513
2.5%
40.email11,090
2.4%
41.garden10,843
2.4%
42.casino10,539
2.3%
43.website10,323
2.3%
44.ink10,251
2.2%
45.nu10,018
2.2%
46.blog9,899
2.2%
47.design9,276
2.0%
48.cyou9,090
2.0%
49.love9,056
2.0%
50.agency8,969
2.0%

What Are Four-Character Domain Names Worth?

Four-character domains sit in a sweet spot between scarcity and availability. With 456,976 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.

Explore Four-Character Availability by TLD

How Are These Combination Counts Calculated?

Domain name labels (the part before the dot) follow strict character rules defined in RFC 5891 and RFC 1035. DNS Checker calculates three tiers of possible combinations for each domain length:

Alphabetic (a–z)

264 = 456,976

Only the 26 lowercase letters. The simplest calculation — each position has 26 choices, so 4 positions gives 264.

Alphanumeric (a–z, 0–9)

364 = 1,679,616

Letters plus digits. Each position has 36 choices. Domain names are case-insensitive, so uppercase and lowercase are equivalent.

All Valid Labels

1,774,224 total

Includes hyphens, but with restrictions. The total is not simply 374 because hyphens have placement rules.

Character SetCharactersFormula4-Char Combinations
Alphabetica–z (26)264456,976
Alphanumerica–z, 0–9 (36)3641,679,616
All Valid Labelsa–z, 0–9, hyphen (37)With placement rules1,774,224

Hyphen Placement Rules

  • No leading hyphen — the first character must be a letter or digit (36 choices, not 37)
  • No trailing hyphen — the last character must also be a letter or digit (36 choices)
  • No double-hyphen at positions 3–4 — labels like 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 4 characters, the double-hyphen rule at positions 3–4 is automatically satisfied since the last character must be alphanumeric. All three counts are mathematical constants that never change — only the number of registered domains (shown in the table above) changes daily.

Frequently Asked Questions

Data updated daily — last snapshot: April 29, 2026