Six-Character Domain Availability

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

There are exactly 2,427,138,432 possible 6-character domain names, two billion four hundred twenty-seven million one hundred thirty-eight thousand four hundred thirty-two. More possible domains than there are grains of sand in a dump truck. At six characters, the namespace starts to feel genuinely vast, yet .com still has surprisingly high saturation.

Using letters only (a–z), there are 308,915,776 possible domains. About as many combinations as the entire population of the United States. A number everyone can picture, and one that is still within reach for a determined registry.

Allowing both letters and digits (a–z, 0–9) creates 2,176,782,336 combinations. Comparable to a third of the world population. Large, but not unimaginable, and new registrations chip away at it every day.

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

Analysis by Ishan Karunaratne

Data updated daily. Last snapshot: July 10, 2026

billion valid combinations

all valid 6-character domain labels (a–z, 0–9, hyphens)

million alphabetic

26⁶ using a–z

billion alphanumeric

36⁶ with digits 0–9

saturation

across 50 TLDs

.com registered

2.9% of total

Which TLDs Are Most Saturated at 6 Characters?

How Full Is Each TLD at 6 Characters?

#	TLD	Registered	% Full (Alpha)	% Full (Alphanum)	Hyphenated	Numeric Only	DNSSEC %	Status
1	.com	8,906,722	2.9%	0.41%	—	389,237	2.9%	Largely Open
2	.top	2,097,080	0.68%	0.10%	—	27,112	5.0%	Largely Open
3	.net	897,003	0.29%	0.04%	43,589	9,496	5.2%	Largely Open
4	.xyz	737,077	0.24%	0.03%	—	216,023	4.3%	Largely Open
5	.info	692,880	0.22%	0.03%	—	1,483	2.3%	Largely Open
6	.org	682,384	0.22%	0.03%	—	3,909	6.1%	Largely Open
7	.vip	611,017	0.20%	0.03%	—	85,873	0.8%	Largely Open
8	.shop	493,820	0.16%	0.02%	—	6,323	14.3%	Largely Open
9	.bond	328,752	0.11%	0.02%	354	366	0.1%	Largely Open
10	.sbs	282,451	0.09%	0.01%	—	7,331	1.8%	Largely Open
11	.online	237,700	0.08%	0.01%	—	1,178	4.0%	Largely Open
12	.asia	211,698	0.07%	0.01%	—	—	1.2%	Largely Open
13	.app	193,772	0.06%	0.01%	2,902	8,426	6.9%	Largely Open
14	.store	165,859	0.05%	0.01%	—	493	3.2%	Largely Open
15	.lol	164,785	0.05%	0.01%	—	68,332	1.3%	Largely Open
16	.site	163,285	0.05%	0.01%	—	1,227	2.5%	Largely Open
17	.cfd	161,366	0.05%	0.01%	—	—	3.0%	Largely Open
18	.ch	141,516	0.05%	0.01%	—	100	51.7%	Largely Open
19	.pro	125,872	0.04%	0.01%	4,159	3,108	5.6%	Largely Open
20	.cyou	120,108	0.04%	0.01%	—	—	1.3%	Largely Open
21	.se	101,884	0.03%	<0.01%	—	130	59.1%	Largely Open
22	.biz	100,102	0.03%	<0.01%	4,429	1,226	4.5%	Largely Open
23	.dev	96,409	0.03%	<0.01%	1,651	56	15.1%	Largely Open
24	.makeup	86,167	0.03%	<0.01%	—	—	0.8%	Largely Open
25	.club	82,766	0.03%	<0.01%	—	—	2.5%	Largely Open
26	.mobi	80,401	0.03%	<0.01%	—	—	8.8%	Largely Open
27	.click	78,315	0.03%	<0.01%	—	—	2.5%	Largely Open
28	.icu	75,380	0.02%	<0.01%	—	—	2.2%	Largely Open
29	.tech	73,671	0.02%	<0.01%	—	—	6.0%	Largely Open
30	.cloud	69,188	0.02%	<0.01%	—	—	7.6%	Largely Open
31	.life	63,551	0.02%	<0.01%	—	—	2.2%	Largely Open
32	.live	60,672	0.02%	<0.01%	—	—	4.0%	Largely Open
33	.space	59,151	0.02%	<0.01%	—	—	3.8%	Largely Open
34	.fun	51,871	0.02%	<0.01%	—	—	2.9%	Largely Open
35	.one	36,469	0.01%	<0.01%	—	—	14.1%	Largely Open
36	.world	36,282	0.01%	<0.01%	—	—	3.5%	Largely Open
37	.garden	33,414	0.01%	<0.01%	—	—	38.4%	Largely Open
38	.beer	32,579	0.01%	<0.01%	—	—	2.5%	Largely Open
39	.art	30,557	0.01%	<0.01%	—	—	8.1%	Largely Open
40	.work	29,937	0.01%	<0.01%	—	—	3.0%	Largely Open
41	.link	29,180	0.01%	<0.01%	—	—	10.5%	Largely Open
42	.digital	27,344	0.01%	<0.01%	—	—	5.8%	Largely Open
43	.beauty	25,478	0.01%	<0.01%	—	—	1.1%	Largely Open
44	.website	25,250	0.01%	<0.01%	—	—	2.6%	Largely Open
45	.blog	24,807	0.01%	<0.01%	—	—	5.4%	Largely Open
46	.bet	24,340	0.01%	<0.01%	—	—	1.3%	Largely Open
47	.studio	24,143	0.01%	<0.01%	—	—	10.4%	Largely Open
48	.autos	22,343	0.01%	<0.01%	—	—	2.4%	Largely Open
49	.win	19,522	0.01%	<0.01%	—	—	6.5%	Largely Open
50	.lat	19,213	0.01%	<0.01%	—	—	4.1%	Largely Open

What Are Six-Character Domain Names Worth?

Six letters is where raw scarcity stops driving the decision and memorability takes over. Most short English words live at this length, and a large share remain registerable outside the legacy extensions.

The question shifts from finding something short to finding something that means anything, so brandable six-letter names trade actively while generic ones sit unsold. Coined words that read cleanly are the ones that hold value.

Explore Six-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)

26⁶ = 308,915,776

Only the 26 lowercase letters. The simplest calculation, each position has 26 choices, so 6 positions gives 26⁶.

Alphanumeric (a–z, 0–9)

36⁶ = 2,176,782,336

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

All Valid Labels

2,427,138,432 total

Includes hyphens, but with restrictions. The total is not simply 37⁶ because hyphens have placement rules.

Character Set	Characters	Formula	6-Char Combinations
Alphabetic	a–z (26)	26⁶	308,915,776
Alphanumeric	a–z, 0–9 (36)	36⁶	2,176,782,336
All Valid Labels	a–z, 0–9, hyphen (37)	With placement rules	2,427,138,432

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 × 37^4 × 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: July 10, 2026

Six-Character Domain Availability

Which TLDs Are Most Saturated at 6 Characters?

How Full Is Each TLD at 6 Characters?

What Are Six-Character Domain Names Worth?

Explore Six-Character Availability by TLD

How Are These Combination Counts Calculated?

Frequently Asked Questions

How many possible 6-character domain names exist?

Are 6-character domains valuable?

Which TLDs still have 6-character domains available?

What does the DNSSEC percentage mean for 6-character domains?

How many 6-character domains are registered across all TLDs?

What is the difference between alphabetic and alphanumeric domain combinations?

Where can I find available 6-character domain names?