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 1, 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	542,651	>99.9%	32.3%	—	3,464	2.0%	Nearly Full
2	.xyz	377,927	82.7%	22.5%	—	1,251	0.9%	Highly Saturated
3	.net	294,114	64.4%	17.5%	—	9,919	3.8%	Moderately Saturated
4	.top	276,745	60.6%	16.5%	—	8,086	2.3%	Moderately Saturated
5	.org	243,916	53.4%	14.5%	—	8,252	4.6%	Moderately Saturated
6	.info	97,590	21.4%	5.8%	—	2,081	4.2%	Widely Available
7	.shop	86,095	18.8%	5.1%	—	—	35.0%	Widely Available
8	.vip	75,483	16.5%	4.5%	—	9,092	2.7%	Widely Available
9	.ch	62,881	13.8%	3.7%	—	1,986	52.6%	Widely Available
10	.online	55,236	12.1%	3.3%	—	420	4.0%	Widely Available
11	.app	50,655	11.1%	3.0%	—	2,799	8.3%	Widely Available
12	.pro	50,504	11.1%	3.0%	—	1,109	5.7%	Widely Available
13	.site	44,452	9.7%	2.6%	—	1,028	2.4%	Largely Open
14	.se	39,409	8.6%	2.4%	—	607	58.4%	Largely Open
15	.store	37,822	8.3%	2.3%	—	670	2.8%	Largely Open
16	.dev	31,121	6.8%	1.9%	—	6	17.2%	Largely Open
17	.biz	27,671	6.1%	1.6%	—	440	5.3%	Largely Open
18	.tech	25,935	5.7%	1.5%	—	—	6.0%	Largely Open
19	.mobi	24,977	5.5%	1.5%	—	—	6.5%	Largely Open
20	.cloud	23,136	5.1%	1.4%	—	—	8.2%	Largely Open
21	.club	21,198	4.6%	1.3%	—	—	4.4%	Largely Open
22	.live	19,749	4.3%	1.2%	—	—	3.8%	Largely Open
23	.space	18,631	4.1%	1.1%	—	—	4.7%	Largely Open
24	.life	15,938	3.5%	0.95%	—	—	3.4%	Largely Open
25	.world	15,397	3.4%	0.92%	—	—	3.9%	Largely Open
26	.one	13,759	3.0%	0.82%	—	—	15.6%	Largely Open
27	.asia	13,553	3.0%	0.81%	—	—	6.0%	Largely Open
28	.work	13,397	2.9%	0.80%	—	—	3.1%	Largely Open
29	.fun	10,679	2.3%	0.64%	—	—	3.0%	Largely Open
30	.studio	10,546	2.3%	0.63%	—	—	8.9%	Largely Open
31	.click	10,311	2.3%	0.61%	—	—	3.1%	Largely Open
32	.bet	10,297	2.3%	0.61%	—	—	1.6%	Largely Open
33	.nu	9,942	2.2%	0.59%	—	—	55.0%	Largely Open
34	.lol	9,284	2.0%	0.55%	—	274	8.3%	Largely Open
35	.ltd	8,944	2.0%	0.53%	—	—	2.9%	Largely Open
36	.icu	7,937	1.7%	0.47%	—	—	1.3%	Largely Open
37	.digital	7,821	1.7%	0.47%	—	—	5.1%	Largely Open
38	.group	7,659	1.7%	0.46%	—	—	4.3%	Largely Open
39	.website	7,566	1.7%	0.45%	—	—	4.3%	Largely Open
40	.li	7,204	1.6%	0.43%	—	—	25.3%	Largely Open
41	.sbs	6,708	1.5%	0.40%	—	26	2.7%	Largely Open
42	.art	6,286	1.4%	0.37%	—	—	7.7%	Largely Open
43	.network	6,269	1.4%	0.37%	—	—	8.7%	Largely Open
44	.blog	5,892	1.3%	0.35%	—	—	4.9%	Largely Open
45	.garden	5,871	1.3%	0.35%	—	—	69.3%	Largely Open
46	.cyou	5,807	1.3%	0.35%	—	—	0.7%	Largely Open
47	.link	5,743	1.3%	0.34%	—	—	5.5%	Largely Open
48	.solutions	5,742	1.3%	0.34%	—	—	5.7%	Largely Open
49	.win	5,306	1.2%	0.32%	—	—	8.5%	Largely Open
50	.email	5,144	1.1%	0.31%	—	—	8.4%	Largely Open

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. DNSChkr 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: April 1, 2026

Four-Character Domain Availability

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

Data updated daily — last snapshot: April 1, 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

How Full Is Each TLD at 4 Characters?

#	TLD	Registered	% Full (Alpha)	% Full (Alphanum)	Hyphenated	Numeric Only	DNSSEC %	Status
1	.com	542,651	>99.9%	32.3%	—	3,464	2.0%	Nearly Full
2	.xyz	377,927	82.7%	22.5%	—	1,251	0.9%	Highly Saturated
3	.net	294,114	64.4%	17.5%	—	9,919	3.8%	Moderately Saturated
4	.top	276,745	60.6%	16.5%	—	8,086	2.3%	Moderately Saturated
5	.org	243,916	53.4%	14.5%	—	8,252	4.6%	Moderately Saturated
6	.info	97,590	21.4%	5.8%	—	2,081	4.2%	Widely Available
7	.shop	86,095	18.8%	5.1%	—	—	35.0%	Widely Available
8	.vip	75,483	16.5%	4.5%	—	9,092	2.7%	Widely Available
9	.ch	62,881	13.8%	3.7%	—	1,986	52.6%	Widely Available
10	.online	55,236	12.1%	3.3%	—	420	4.0%	Widely Available
11	.app	50,655	11.1%	3.0%	—	2,799	8.3%	Widely Available
12	.pro	50,504	11.1%	3.0%	—	1,109	5.7%	Widely Available
13	.site	44,452	9.7%	2.6%	—	1,028	2.4%	Largely Open
14	.se	39,409	8.6%	2.4%	—	607	58.4%	Largely Open
15	.store	37,822	8.3%	2.3%	—	670	2.8%	Largely Open
16	.dev	31,121	6.8%	1.9%	—	6	17.2%	Largely Open
17	.biz	27,671	6.1%	1.6%	—	440	5.3%	Largely Open
18	.tech	25,935	5.7%	1.5%	—	—	6.0%	Largely Open
19	.mobi	24,977	5.5%	1.5%	—	—	6.5%	Largely Open
20	.cloud	23,136	5.1%	1.4%	—	—	8.2%	Largely Open
21	.club	21,198	4.6%	1.3%	—	—	4.4%	Largely Open
22	.live	19,749	4.3%	1.2%	—	—	3.8%	Largely Open
23	.space	18,631	4.1%	1.1%	—	—	4.7%	Largely Open
24	.life	15,938	3.5%	0.95%	—	—	3.4%	Largely Open
25	.world	15,397	3.4%	0.92%	—	—	3.9%	Largely Open
26	.one	13,759	3.0%	0.82%	—	—	15.6%	Largely Open
27	.asia	13,553	3.0%	0.81%	—	—	6.0%	Largely Open
28	.work	13,397	2.9%	0.80%	—	—	3.1%	Largely Open
29	.fun	10,679	2.3%	0.64%	—	—	3.0%	Largely Open
30	.studio	10,546	2.3%	0.63%	—	—	8.9%	Largely Open
31	.click	10,311	2.3%	0.61%	—	—	3.1%	Largely Open
32	.bet	10,297	2.3%	0.61%	—	—	1.6%	Largely Open
33	.nu	9,942	2.2%	0.59%	—	—	55.0%	Largely Open
34	.lol	9,284	2.0%	0.55%	—	274	8.3%	Largely Open
35	.ltd	8,944	2.0%	0.53%	—	—	2.9%	Largely Open
36	.icu	7,937	1.7%	0.47%	—	—	1.3%	Largely Open
37	.digital	7,821	1.7%	0.47%	—	—	5.1%	Largely Open
38	.group	7,659	1.7%	0.46%	—	—	4.3%	Largely Open
39	.website	7,566	1.7%	0.45%	—	—	4.3%	Largely Open
40	.li	7,204	1.6%	0.43%	—	—	25.3%	Largely Open
41	.sbs	6,708	1.5%	0.40%	—	26	2.7%	Largely Open
42	.art	6,286	1.4%	0.37%	—	—	7.7%	Largely Open
43	.network	6,269	1.4%	0.37%	—	—	8.7%	Largely Open
44	.blog	5,892	1.3%	0.35%	—	—	4.9%	Largely Open
45	.garden	5,871	1.3%	0.35%	—	—	69.3%	Largely Open
46	.cyou	5,807	1.3%	0.35%	—	—	0.7%	Largely Open
47	.link	5,743	1.3%	0.34%	—	—	5.5%	Largely Open
48	.solutions	5,742	1.3%	0.34%	—	—	5.7%	Largely Open
49	.win	5,306	1.2%	0.32%	—	—	8.5%	Largely Open
50	.email	5,144	1.1%	0.31%	—	—	8.4%	Largely Open

What Are Four-Character Domain Names Worth?

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.

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. DNSChkr 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.

Frequently Asked Questions

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?

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?