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DNS Checker(beta)

Twelve-Character Domain Availability

There are exactly 6,227,373,173,281,250,688 possible 12-character domain names — six quintillion two hundred twenty-seven quadrillion three hundred seventy-three trillion one hundred seventy-three billion two hundred eighty-one million two hundred fifty thousand six hundred eighty-eight. If every person on Earth registered one million domains per day, it would take over two thousand years to use them all. The twelve-character namespace is, for all practical purposes, infinite.

Using letters only (a–z), there are 95,428,956,661,682,176 possible domains. That is roughly twelve million possible domains for every person alive on Earth. Even limiting to letters only, the namespace is inexhaustible.

Allowing both letters and digits (a–z, 0–9) creates 4,738,381,338,321,616,896 combinations. More combinations than the estimated number of grains of sand on every beach on Earth — multiplied by 500. A number that exceeds human imagination.

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

Data updated daily — last snapshot: April 29, 2026
6,227,373,173,281,250,688 valid domain combinations

quintillion valid combinations

all valid 12-character domain labels (a–z, 0–9, hyphens)

Alphabetic combinations

quadrillion alphabetic

2612 using a–z

Alphanumeric combinations

quintillion alphanumeric

3612 with digits 0–9

Average saturation

saturation

across 50 TLDs

Total registered domains

.com registered

<0.01% of total

Which TLDs Are Most Saturated at 12 Characters?

1
Registered13,299,229
Saturation<0.01%
2
Registered905,372
Saturation<0.01%
3
Registered851,082
Saturation<0.01%
4
Registered484,321
Saturation<0.01%
5
Registered342,788
Saturation<0.01%

How Full Is Each TLD at 12 Characters?

#TLDRegistered% Full (Alpha)
1.com13,299,229
<0.01%
2.net905,372
<0.01%
3.org851,082
<0.01%
4.xyz484,321
<0.01%
5.info342,788
<0.01%
6.online278,079
<0.01%
7.shop264,129
<0.01%
8.ch199,495
<0.01%
9.store184,061
<0.01%
10.top150,691
<0.01%
11.site140,005
<0.01%
12.se102,680
<0.01%
13.biz82,724
<0.01%
14.pro62,501
<0.01%
15.app56,188
<0.01%
16.sbs52,000
<0.01%
17.click48,143
<0.01%
18.space42,835
<0.01%
19.live35,685
<0.01%
20.dev33,415
<0.01%
21.club32,505
<0.01%
22.vip31,934
<0.01%
23.blog27,785
<0.01%
24.world27,575
<0.01%
25.tech27,005
<0.01%
26.icu26,934
<0.01%
27.cloud26,246
<0.01%
28.life24,378
<0.01%
29.art23,595
<0.01%
30.digital22,427
<0.01%
31.fun21,375
<0.01%
32.cfd20,527
<0.01%
33.asia16,674
<0.01%
34.website15,095
<0.01%
35.link14,914
<0.01%
36.mobi14,796
<0.01%
37.bond12,365
<0.01%
38.work12,150
<0.01%
39.nu11,619
<0.01%
40.cyou11,503
<0.01%
41.lat9,598
<0.01%
42.studio9,403
<0.01%
43.lol9,385
<0.01%
44.one8,713
<0.01%
45.today8,427
<0.01%
46.help8,209
<0.01%
47.buzz7,891
<0.01%
48.cat7,655
<0.01%
49.agency6,804
<0.01%
50.design6,652
<0.01%

What Are Twelve-Character Domain Names Worth?

At 12 characters, the domain namespace becomes vast — 95,428,956,661,682,176 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.

Explore Twelve-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)

2612 = 95,428,956,661,682,176

Only the 26 lowercase letters. The simplest calculation — each position has 26 choices, so 12 positions gives 2612.

Alphanumeric (a–z, 0–9)

3612 = 4,738,381,338,321,616,896

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

All Valid Labels

6,227,373,173,281,250,688 total

Includes hyphens, but with restrictions. The total is not simply 3712 because hyphens have placement rules.

Character SetCharactersFormula12-Char Combinations
Alphabetica–z (26)261295,428,956,661,682,176
Alphanumerica–z, 0–9 (36)36124,738,381,338,321,616,896
All Valid Labelsa–z, 0–9, hyphen (37)With placement rules6,227,373,173,281,250,688

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 the "all valid" count is less than a simple 36 × 37^10 × 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.

Frequently Asked Questions

Data updated daily — last snapshot: April 29, 2026