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DNS Checker(beta)

Eleven-Character Domain Availability

There are exactly 168,307,383,061,655,424 possible 11-character domain names — one hundred sixty-eight quadrillion three hundred seven trillion three hundred eighty-three billion sixty-one million six hundred fifty-five thousand four hundred twenty-four. If each domain name were printed on a sheet of paper and stacked, the pile would reach from Earth to the Sun — and then continue another 20 million miles beyond it.

Using letters only (a–z), there are 3,670,344,486,987,776 possible domains. Printed on standard paper, these combinations would form a stack tall enough to reach the Moon over 15 times. The letter-only namespace alone is beyond comprehension.

Allowing both letters and digits (a–z, 0–9) creates 131,621,703,842,267,136 combinations. More possible domains than the number of cells in 15,000 human bodies. A number so large it defies any practical comparison.

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

Data updated daily — last snapshot: April 29, 2026
168,307,383,061,655,424 valid domain combinations

quadrillion valid combinations

all valid 11-character domain labels (a–z, 0–9, hyphens)

Alphabetic combinations

quadrillion alphabetic

2611 using a–z

Alphanumeric combinations

quadrillion alphanumeric

3611 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 11 Characters?

1
Registered13,603,643
Saturation<0.01%
2
Registered998,042
Saturation<0.01%
3
Registered886,046
Saturation<0.01%
4
Registered607,573
Saturation<0.01%
5
Registered359,496
Saturation<0.01%

How Full Is Each TLD at 11 Characters?

#TLDRegistered% Full (Alpha)
1.com13,603,643
<0.01%
2.net998,042
<0.01%
3.org886,046
<0.01%
4.xyz607,573
<0.01%
5.info359,496
<0.01%
6.online307,065
<0.01%
7.shop299,059
<0.01%
8.ch208,933
<0.01%
9.store203,846
<0.01%
10.top182,793
<0.01%
11.site157,401
<0.01%
12.se112,545
<0.01%
13.biz94,893
<0.01%
14.app80,585
<0.01%
15.pro69,715
<0.01%
16.vip65,352
<0.01%
17.sbs60,289
<0.01%
18.click47,872
<0.01%
19.dev44,967
<0.01%
20.space43,458
<0.01%
21.live42,526
<0.01%
22.club38,621
<0.01%
23.tech35,490
<0.01%
24.icu34,141
<0.01%
25.cloud33,812
<0.01%
26.life29,650
<0.01%
27.world29,254
<0.01%
28.blog29,148
<0.01%
29.art27,860
<0.01%
30.fun27,603
<0.01%
31.cfd23,407
<0.01%
32.digital22,689
<0.01%
33.asia21,465
<0.01%
34.website17,811
<0.01%
35.link17,084
<0.01%
36.mobi15,823
<0.01%
37.work15,510
<0.01%
38.bond14,233
<0.01%
39.nu13,918
<0.01%
40.cyou13,676
<0.01%
41.buzz13,630
<0.01%
42.lol13,448
<0.01%
43.lat12,401
<0.01%
44.studio12,148
<0.01%
45.one11,960
<0.01%
46.cat8,654
<0.01%
47.design8,381
<0.01%
48.help8,302
<0.01%
49.agency8,269
<0.01%
50.today8,004
<0.01%

What Are Eleven-Character Domain Names Worth?

At 11 characters, the domain namespace becomes vast — 3,670,344,486,987,776 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 Eleven-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)

2611 = 3,670,344,486,987,776

Only the 26 lowercase letters. The simplest calculation — each position has 26 choices, so 11 positions gives 2611.

Alphanumeric (a–z, 0–9)

3611 = 131,621,703,842,267,136

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

All Valid Labels

168,307,383,061,655,424 total

Includes hyphens, but with restrictions. The total is not simply 3711 because hyphens have placement rules.

Character SetCharactersFormula11-Char Combinations
Alphabetica–z (26)26113,670,344,486,987,776
Alphanumerica–z, 0–9 (36)3611131,621,703,842,267,136
All Valid Labelsa–z, 0–9, hyphen (37)With placement rules168,307,383,061,655,424

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 × 37^9 × 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