Four-Character Domain Availability

Name: Four-Character Domain Registration Density
Creator: Ishan Karunaratne

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.

Analysis by Ishan Karunaratne

Data updated daily. Last snapshot: July 11, 2026

million valid combinations

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

thousand alphabetic

26⁴ using a–z

million alphanumeric

36⁴ with digits 0–9

saturation

across 50 TLDs

.com registered

>99.9% of total

Which TLDs Are Most Saturated at 4 Characters?

How Full Is Each TLD at 4 Characters?

#	TLD	Registered	% Full (Alpha)	% Full (Alphanum)	Hyphenated	Numeric Only	DNSSEC %	Status
1	.com	1,119,880	>99.9%	66.7%	—	9,909	2.0%	Nearly Full
2	.xyz	533,671	>99.9%	31.8%	—	1,803	1.0%	Nearly Full
3	.top	350,999	76.8%	20.9%	—	8,782	2.6%	Highly Saturated
4	.net	323,105	70.7%	19.2%	—	9,950	3.8%	Highly Saturated
5	.org	271,785	59.5%	16.2%	—	9,679	5.3%	Moderately Saturated
6	.info	113,446	24.8%	6.8%	—	2,362	4.3%	Widely Available
7	.shop	109,323	23.9%	6.5%	—	37	29.1%	Widely Available
8	.vip	90,383	19.8%	5.4%	—	9,573	2.5%	Widely Available
9	.app	81,807	17.9%	4.9%	—	7,597	6.6%	Widely Available
10	.online	72,628	15.9%	4.3%	—	1,121	4.1%	Widely Available
11	.ch	64,715	14.2%	3.9%	—	2,077	52.5%	Widely Available
12	.pro	61,802	13.5%	3.7%	—	2,207	5.4%	Widely Available
13	.site	55,794	12.2%	3.3%	—	1,228	2.6%	Widely Available
14	.dev	50,361	11.0%	3.0%	—	98	16.2%	Widely Available
15	.store	46,313	10.1%	2.8%	—	851	3.2%	Widely Available
16	.se	40,868	8.9%	2.4%	—	643	57.7%	Largely Open
17	.mobi	38,315	8.4%	2.3%	—	—	6.2%	Largely Open
18	.biz	35,656	7.8%	2.1%	—	644	5.1%	Largely Open
19	.tech	32,496	7.1%	1.9%	—	—	6.0%	Largely Open
20	.fun	31,779	7.0%	1.9%	—	—	2.8%	Largely Open
21	.club	31,013	6.8%	1.9%	—	—	4.2%	Largely Open
22	.cloud	30,122	6.6%	1.8%	—	—	7.8%	Largely Open
23	.live	29,965	6.6%	1.8%	—	—	3.8%	Largely Open
24	.asia	28,436	6.2%	1.7%	—	—	4.8%	Largely Open
25	.one	25,971	5.7%	1.6%	—	—	15.1%	Largely Open
26	.life	24,893	5.5%	1.5%	—	—	3.1%	Largely Open
27	.space	23,808	5.2%	1.4%	—	—	4.5%	Largely Open
28	.lol	21,748	4.8%	1.3%	—	576	4.6%	Largely Open
29	.click	21,727	4.8%	1.3%	—	—	2.6%	Largely Open
30	.bet	21,245	4.7%	1.3%	—	—	1.2%	Largely Open
31	.work	19,918	4.4%	1.2%	—	—	3.2%	Largely Open
32	.icu	19,689	4.3%	1.2%	—	—	1.6%	Largely Open
33	.world	19,232	4.2%	1.1%	—	—	4.0%	Largely Open
34	.studio	16,606	3.6%	0.99%	—	—	10.0%	Largely Open
35	.win	15,817	3.5%	0.94%	—	—	6.8%	Largely Open
36	.ltd	15,615	3.4%	0.93%	—	—	3.0%	Largely Open
37	.group	14,965	3.3%	0.89%	—	—	4.6%	Largely Open
38	.casino	14,851	3.3%	0.88%	—	—	21.6%	Largely Open
39	.link	14,834	3.3%	0.88%	—	—	5.7%	Largely Open
40	.digital	14,289	3.1%	0.85%	—	—	4.9%	Largely Open
41	.garden	13,864	3.0%	0.83%	—	—	80.9%	Largely Open
42	.email	11,599	2.5%	0.69%	—	—	9.4%	Largely Open
43	.ink	11,540	2.5%	0.69%	—	—	4.8%	Largely Open
44	.lat	11,389	2.5%	0.68%	—	—	5.8%	Largely Open
45	.website	11,335	2.5%	0.67%	—	—	4.3%	Largely Open
46	.blog	10,663	2.3%	0.63%	—	—	5.5%	Largely Open
47	.homes	10,540	2.3%	0.63%	—	—	3.2%	Largely Open
48	.nu	10,213	2.2%	0.61%	—	—	54.1%	Largely Open
49	.design	9,826	2.1%	0.59%	—	—	7.8%	Largely Open
50	.sbs	9,629	2.1%	0.57%	—	57	2.6%	Largely Open

What Are Four-Character Domain Names Worth?

Four characters is the first length where a brand can secure a short, ownable name without entering the aftermarket, although .com itself is effectively full. A generation of consumer startups planted their flags here, including Hulu, Etsy, and Lyft.

Consonant-vowel-consonant-vowel patterns command the steepest premiums because they read as invented yet pronounceable. Outside .com, four-character availability is common across newer TLDs at standard registration prices.

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 Set	Characters	Formula	4-Char Combinations
Alphabetic	a–z (26)	26⁴	456,976
Alphanumeric	a–z, 0–9 (36)	36⁴	1,679,616
All Valid Labels	a–z, 0–9, hyphen (37)	With placement rules	1,774,224

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: July 11, 2026

Four-Character Domain Availability

Which TLDs Are Most Saturated at 4 Characters?

How Full Is Each TLD at 4 Characters?

What Are Four-Character Domain Names Worth?

Explore Four-Character Availability by TLD

How Are These Combination Counts Calculated?

Frequently Asked Questions

How many possible 4-character domain names exist?

Are 4-character domains valuable?

Which TLDs still have 4-character domains available?

What does the DNSSEC percentage mean for 4-character domains?

How many 4-character domains are registered across all TLDs?

What is the difference between alphabetic and alphanumeric domain combinations?

Where can I find available 4-character domain names?