Ten-Character Domain Availability

Name: Ten-Character Domain Registration Density
Creator: DNS Checker

There are exactly 4,548,848,190,855,552 possible 10-character domain names — four quadrillion five hundred forty-eight trillion eight hundred forty-eight billion one hundred ninety million eight hundred fifty-five thousand five hundred fifty-two. If each domain name were one millimeter long, laid end to end they would stretch from the Sun to Neptune and back — over 30 times. The ten-character namespace is planetary in scale.

Using letters only (a–z), there are 141,167,095,653,376 possible domains. Laid end to end as millimeter marks, these domains would span a round trip to Mars. Even letter-only combinations are astronomically large at this length.

Allowing both letters and digits (a–z, 0–9) creates 3,656,158,440,062,976 combinations. More combinations than the distance in millimeters from Earth to Pluto. No TLD will ever come close to saturating ten-character alphanumeric domains.

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

Data updated daily — last snapshot: April 29, 2026

quadrillion valid combinations

all valid 10-character domain labels (a–z, 0–9, hyphens)

trillion alphabetic

26¹⁰ using a–z

quadrillion alphanumeric

36¹⁰ with digits 0–9

saturation

across 50 TLDs

.com registered

<0.01% of total

Which TLDs Are Most Saturated at 10 Characters?

How Full Is Each TLD at 10 Characters?

#	TLD	Registered	% Full (Alpha)	% Full (Alphanum)	Hyphenated	Numeric Only	DNSSEC %	Status
1	.com	13,322,638	<0.01%	<0.01%	1,257,983	19,671	4.3%	Largely Open
2	.net	1,072,277	<0.01%	<0.01%	110,022	588	5.1%	Largely Open
3	.org	908,299	<0.01%	<0.01%	75,967	147	5.2%	Largely Open
4	.xyz	684,088	<0.01%	<0.01%	—	2,419	1.1%	Largely Open
5	.shop	361,626	<0.01%	<0.01%	19,990	388	7.8%	Largely Open
6	.info	357,802	<0.01%	<0.01%	39,830	257	4.5%	Largely Open
7	.online	332,784	<0.01%	<0.01%	39,073	164	3.5%	Largely Open
8	.top	284,306	<0.01%	<0.01%	29,067	697	1.4%	Largely Open
9	.store	223,333	<0.01%	<0.01%	17,271	54	2.3%	Largely Open
10	.ch	211,967	<0.01%	<0.01%	52,098	88	53.1%	Largely Open
11	.site	172,135	<0.01%	<0.01%	18,618	84	2.2%	Largely Open
12	.pro	147,476	<0.01%	<0.01%	8,097	7	2.4%	Largely Open
13	.se	123,633	<0.01%	<0.01%	6,854	44	61.4%	Largely Open
14	.skin	115,278	<0.01%	<0.01%	—	—	0.2%	Largely Open
15	.app	110,143	<0.01%	<0.01%	6,477	12	8.5%	Largely Open
16	.vip	107,792	<0.01%	<0.01%	7,423	215	0.6%	Largely Open
17	.biz	106,065	<0.01%	<0.01%	10,796	27	3.4%	Largely Open
18	.sbs	67,134	<0.01%	<0.01%	6,482	668	3.7%	Largely Open
19	.run	66,410	<0.01%	<0.01%	—	—	0.3%	Largely Open
20	.dev	58,038	<0.01%	<0.01%	3,107	5	14.7%	Largely Open
21	.click	54,511	<0.01%	<0.01%	—	—	2.5%	Largely Open
22	.space	50,990	<0.01%	<0.01%	—	—	3.1%	Largely Open
23	.live	50,794	<0.01%	<0.01%	—	—	2.8%	Largely Open
24	.world	48,222	<0.01%	<0.01%	—	—	1.9%	Largely Open
25	.club	46,559	<0.01%	<0.01%	—	—	2.9%	Largely Open
26	.tech	46,127	<0.01%	<0.01%	—	—	5.6%	Largely Open
27	.cloud	44,315	<0.01%	<0.01%	—	—	6.6%	Largely Open
28	.icu	38,742	<0.01%	<0.01%	—	—	1.5%	Largely Open
29	.cfd	38,390	<0.01%	<0.01%	—	—	6.3%	Largely Open
30	.fun	35,467	<0.01%	<0.01%	—	—	3.6%	Largely Open
31	.life	33,921	<0.01%	<0.01%	—	—	2.2%	Largely Open
32	.cyou	32,471	<0.01%	<0.01%	—	—	3.1%	Largely Open
33	.art	30,452	<0.01%	<0.01%	—	—	7.9%	Largely Open
34	.blog	30,381	<0.01%	<0.01%	—	—	5.0%	Largely Open
35	.digital	27,621	<0.01%	<0.01%	—	—	2.6%	Largely Open
36	.asia	27,262	<0.01%	<0.01%	—	—	3.6%	Largely Open
37	.hair	25,060	<0.01%	<0.01%	—	—	0.3%	Largely Open
38	.today	24,825	<0.01%	<0.01%	—	—	1.1%	Largely Open
39	.bond	22,821	<0.01%	<0.01%	1,803	—	0.9%	Largely Open
40	.work	21,473	<0.01%	<0.01%	—	—	3.6%	Largely Open
41	.website	20,739	<0.01%	<0.01%	—	—	3.1%	Largely Open
42	.link	19,929	<0.01%	<0.01%	—	—	17.2%	Largely Open
43	.forum	19,396	<0.01%	<0.01%	—	—	8.2%	Largely Open
44	.mobi	17,933	<0.01%	<0.01%	—	—	1.6%	Largely Open
45	.baby	16,717	<0.01%	<0.01%	—	—	0.3%	Largely Open
46	.lol	16,537	<0.01%	<0.01%	1,331	61	11.0%	Largely Open
47	.nu	16,264	<0.01%	<0.01%	—	—	58.1%	Largely Open
48	.studio	16,045	<0.01%	<0.01%	—	—	8.9%	Largely Open
49	.one	15,941	<0.01%	<0.01%	—	—	21.6%	Largely Open
50	.pics	14,723	<0.01%	<0.01%	—	—	3.0%	Largely Open

What Are Ten-Character Domain Names Worth?

At 10 characters, the domain namespace becomes vast — 141,167,095,653,376 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 Ten-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)

26¹⁰ = 141,167,095,653,376

Only the 26 lowercase letters. The simplest calculation — each position has 26 choices, so 10 positions gives 26¹⁰.

Alphanumeric (a–z, 0–9)

36¹⁰ = 3,656,158,440,062,976

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

All Valid Labels

4,548,848,190,855,552 total

Includes hyphens, but with restrictions. The total is not simply 37¹⁰ because hyphens have placement rules.

Character Set	Characters	Formula	10-Char Combinations
Alphabetic	a–z (26)	26¹⁰	141,167,095,653,376
Alphanumeric	a–z, 0–9 (36)	36¹⁰	3,656,158,440,062,976
All Valid Labels	a–z, 0–9, hyphen (37)	With placement rules	4,548,848,190,855,552

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 × 37^8 × 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

Ten-Character Domain Availability

Which TLDs Are Most Saturated at 10 Characters?

How Full Is Each TLD at 10 Characters?

What Are Ten-Character Domain Names Worth?

Explore Ten-Character Availability by TLD

How Are These Combination Counts Calculated?

Frequently Asked Questions

How many possible 10-character domain names exist?

Are 10-character domains valuable?

Which TLDs still have 10-character domains available?

What does the DNSSEC percentage mean for 10-character domains?

How many 10-character domains are registered across all TLDs?

What is the difference between alphabetic and alphanumeric domain combinations?

Where can I find available 10-character domain names?