IPv4 Subnet Calculator

Enter an IP with a CIDR prefix or a subnet mask to see its network, broadcast, host range, and host count. You can also split the network into smaller subnets.

Try:192.168.1.10/24 10.0.0.0/8 172.16.5.4/20 203.0.113.9/29

IPv6 calculator →

private IP (RFC 1918)10.166.68.0/22

network10.166.68.0/22

broadcast10.166.71.255

first host10.166.68.1

last host10.166.71.254

subnet mask255.255.252.0

wildcard0.0.3.255

addresses1,024

usable hosts1,022

classA

ipcalc 10.166.68.0/22

address00001010.10100110.01000100.00000000

subnet mask11111111.11111111.11111100.00000000

network00001010.10100110.01000100.00000000

broadcast00001010.10100110.01000111.11111111

green = network part, grey = host part

hex0x0aa64400

decimal178668544

reverse dns0.68.166.10.in-addr.arpa

ipv4-mapped::ffff:aa6:4400

/22 split into /29 · 128 subnets

close ×

#	network	host range	broadcast
1	10.166.68.0/29	10.166.68.1 – 10.166.68.6	10.166.68.7
2	10.166.68.8/29	10.166.68.9 – 10.166.68.14	10.166.68.15
3	10.166.68.16/29	10.166.68.17 – 10.166.68.22	10.166.68.23
4	10.166.68.24/29	10.166.68.25 – 10.166.68.30	10.166.68.31
5	10.166.68.32/29	10.166.68.33 – 10.166.68.38	10.166.68.39
6	10.166.68.40/29	10.166.68.41 – 10.166.68.46	10.166.68.47
7	10.166.68.48/29	10.166.68.49 – 10.166.68.54	10.166.68.55
8	10.166.68.56/29	10.166.68.57 – 10.166.68.62	10.166.68.63
9	10.166.68.64/29	10.166.68.65 – 10.166.68.70	10.166.68.71
10	10.166.68.72/29	10.166.68.73 – 10.166.68.78	10.166.68.79
11	10.166.68.80/29	10.166.68.81 – 10.166.68.86	10.166.68.87
12	10.166.68.88/29	10.166.68.89 – 10.166.68.94	10.166.68.95
13	10.166.68.96/29	10.166.68.97 – 10.166.68.102	10.166.68.103
14	10.166.68.104/29	10.166.68.105 – 10.166.68.110	10.166.68.111
15	10.166.68.112/29	10.166.68.113 – 10.166.68.118	10.166.68.119
16	10.166.68.120/29	10.166.68.121 – 10.166.68.126	10.166.68.127
17	10.166.68.128/29	10.166.68.129 – 10.166.68.134	10.166.68.135
18	10.166.68.136/29	10.166.68.137 – 10.166.68.142	10.166.68.143
19	10.166.68.144/29	10.166.68.145 – 10.166.68.150	10.166.68.151
20	10.166.68.152/29	10.166.68.153 – 10.166.68.158	10.166.68.159
21	10.166.68.160/29	10.166.68.161 – 10.166.68.166	10.166.68.167
22	10.166.68.168/29	10.166.68.169 – 10.166.68.174	10.166.68.175
23	10.166.68.176/29	10.166.68.177 – 10.166.68.182	10.166.68.183
24	10.166.68.184/29	10.166.68.185 – 10.166.68.190	10.166.68.191
25	10.166.68.192/29	10.166.68.193 – 10.166.68.198	10.166.68.199
26	10.166.68.200/29	10.166.68.201 – 10.166.68.206	10.166.68.207
27	10.166.68.208/29	10.166.68.209 – 10.166.68.214	10.166.68.215
28	10.166.68.216/29	10.166.68.217 – 10.166.68.222	10.166.68.223
29	10.166.68.224/29	10.166.68.225 – 10.166.68.230	10.166.68.231
30	10.166.68.232/29	10.166.68.233 – 10.166.68.238	10.166.68.239
31	10.166.68.240/29	10.166.68.241 – 10.166.68.246	10.166.68.247
32	10.166.68.248/29	10.166.68.249 – 10.166.68.254	10.166.68.255
33	10.166.69.0/29	10.166.69.1 – 10.166.69.6	10.166.69.7
34	10.166.69.8/29	10.166.69.9 – 10.166.69.14	10.166.69.15
35	10.166.69.16/29	10.166.69.17 – 10.166.69.22	10.166.69.23
36	10.166.69.24/29	10.166.69.25 – 10.166.69.30	10.166.69.31
37	10.166.69.32/29	10.166.69.33 – 10.166.69.38	10.166.69.39
38	10.166.69.40/29	10.166.69.41 – 10.166.69.46	10.166.69.47
39	10.166.69.48/29	10.166.69.49 – 10.166.69.54	10.166.69.55
40	10.166.69.56/29	10.166.69.57 – 10.166.69.62	10.166.69.63
41	10.166.69.64/29	10.166.69.65 – 10.166.69.70	10.166.69.71
42	10.166.69.72/29	10.166.69.73 – 10.166.69.78	10.166.69.79
43	10.166.69.80/29	10.166.69.81 – 10.166.69.86	10.166.69.87
44	10.166.69.88/29	10.166.69.89 – 10.166.69.94	10.166.69.95
45	10.166.69.96/29	10.166.69.97 – 10.166.69.102	10.166.69.103
46	10.166.69.104/29	10.166.69.105 – 10.166.69.110	10.166.69.111
47	10.166.69.112/29	10.166.69.113 – 10.166.69.118	10.166.69.119
48	10.166.69.120/29	10.166.69.121 – 10.166.69.126	10.166.69.127
49	10.166.69.128/29	10.166.69.129 – 10.166.69.134	10.166.69.135
50	10.166.69.136/29	10.166.69.137 – 10.166.69.142	10.166.69.143
51	10.166.69.144/29	10.166.69.145 – 10.166.69.150	10.166.69.151
52	10.166.69.152/29	10.166.69.153 – 10.166.69.158	10.166.69.159
53	10.166.69.160/29	10.166.69.161 – 10.166.69.166	10.166.69.167
54	10.166.69.168/29	10.166.69.169 – 10.166.69.174	10.166.69.175
55	10.166.69.176/29	10.166.69.177 – 10.166.69.182	10.166.69.183
56	10.166.69.184/29	10.166.69.185 – 10.166.69.190	10.166.69.191
57	10.166.69.192/29	10.166.69.193 – 10.166.69.198	10.166.69.199
58	10.166.69.200/29	10.166.69.201 – 10.166.69.206	10.166.69.207
59	10.166.69.208/29	10.166.69.209 – 10.166.69.214	10.166.69.215
60	10.166.69.216/29	10.166.69.217 – 10.166.69.222	10.166.69.223
61	10.166.69.224/29	10.166.69.225 – 10.166.69.230	10.166.69.231
62	10.166.69.232/29	10.166.69.233 – 10.166.69.238	10.166.69.239
63	10.166.69.240/29	10.166.69.241 – 10.166.69.246	10.166.69.247
64	10.166.69.248/29	10.166.69.249 – 10.166.69.254	10.166.69.255
65	10.166.70.0/29	10.166.70.1 – 10.166.70.6	10.166.70.7
66	10.166.70.8/29	10.166.70.9 – 10.166.70.14	10.166.70.15
67	10.166.70.16/29	10.166.70.17 – 10.166.70.22	10.166.70.23
68	10.166.70.24/29	10.166.70.25 – 10.166.70.30	10.166.70.31
69	10.166.70.32/29	10.166.70.33 – 10.166.70.38	10.166.70.39
70	10.166.70.40/29	10.166.70.41 – 10.166.70.46	10.166.70.47
71	10.166.70.48/29	10.166.70.49 – 10.166.70.54	10.166.70.55
72	10.166.70.56/29	10.166.70.57 – 10.166.70.62	10.166.70.63
73	10.166.70.64/29	10.166.70.65 – 10.166.70.70	10.166.70.71
74	10.166.70.72/29	10.166.70.73 – 10.166.70.78	10.166.70.79
75	10.166.70.80/29	10.166.70.81 – 10.166.70.86	10.166.70.87
76	10.166.70.88/29	10.166.70.89 – 10.166.70.94	10.166.70.95
77	10.166.70.96/29	10.166.70.97 – 10.166.70.102	10.166.70.103
78	10.166.70.104/29	10.166.70.105 – 10.166.70.110	10.166.70.111
79	10.166.70.112/29	10.166.70.113 – 10.166.70.118	10.166.70.119
80	10.166.70.120/29	10.166.70.121 – 10.166.70.126	10.166.70.127
81	10.166.70.128/29	10.166.70.129 – 10.166.70.134	10.166.70.135
82	10.166.70.136/29	10.166.70.137 – 10.166.70.142	10.166.70.143
83	10.166.70.144/29	10.166.70.145 – 10.166.70.150	10.166.70.151
84	10.166.70.152/29	10.166.70.153 – 10.166.70.158	10.166.70.159
85	10.166.70.160/29	10.166.70.161 – 10.166.70.166	10.166.70.167
86	10.166.70.168/29	10.166.70.169 – 10.166.70.174	10.166.70.175
87	10.166.70.176/29	10.166.70.177 – 10.166.70.182	10.166.70.183
88	10.166.70.184/29	10.166.70.185 – 10.166.70.190	10.166.70.191
89	10.166.70.192/29	10.166.70.193 – 10.166.70.198	10.166.70.199
90	10.166.70.200/29	10.166.70.201 – 10.166.70.206	10.166.70.207
91	10.166.70.208/29	10.166.70.209 – 10.166.70.214	10.166.70.215
92	10.166.70.216/29	10.166.70.217 – 10.166.70.222	10.166.70.223
93	10.166.70.224/29	10.166.70.225 – 10.166.70.230	10.166.70.231
94	10.166.70.232/29	10.166.70.233 – 10.166.70.238	10.166.70.239
95	10.166.70.240/29	10.166.70.241 – 10.166.70.246	10.166.70.247
96	10.166.70.248/29	10.166.70.249 – 10.166.70.254	10.166.70.255
97	10.166.71.0/29	10.166.71.1 – 10.166.71.6	10.166.71.7
98	10.166.71.8/29	10.166.71.9 – 10.166.71.14	10.166.71.15
99	10.166.71.16/29	10.166.71.17 – 10.166.71.22	10.166.71.23
100	10.166.71.24/29	10.166.71.25 – 10.166.71.30	10.166.71.31
101	10.166.71.32/29	10.166.71.33 – 10.166.71.38	10.166.71.39
102	10.166.71.40/29	10.166.71.41 – 10.166.71.46	10.166.71.47
103	10.166.71.48/29	10.166.71.49 – 10.166.71.54	10.166.71.55
104	10.166.71.56/29	10.166.71.57 – 10.166.71.62	10.166.71.63
105	10.166.71.64/29	10.166.71.65 – 10.166.71.70	10.166.71.71
106	10.166.71.72/29	10.166.71.73 – 10.166.71.78	10.166.71.79
107	10.166.71.80/29	10.166.71.81 – 10.166.71.86	10.166.71.87
108	10.166.71.88/29	10.166.71.89 – 10.166.71.94	10.166.71.95
109	10.166.71.96/29	10.166.71.97 – 10.166.71.102	10.166.71.103
110	10.166.71.104/29	10.166.71.105 – 10.166.71.110	10.166.71.111
111	10.166.71.112/29	10.166.71.113 – 10.166.71.118	10.166.71.119
112	10.166.71.120/29	10.166.71.121 – 10.166.71.126	10.166.71.127
113	10.166.71.128/29	10.166.71.129 – 10.166.71.134	10.166.71.135
114	10.166.71.136/29	10.166.71.137 – 10.166.71.142	10.166.71.143
115	10.166.71.144/29	10.166.71.145 – 10.166.71.150	10.166.71.151
116	10.166.71.152/29	10.166.71.153 – 10.166.71.158	10.166.71.159
117	10.166.71.160/29	10.166.71.161 – 10.166.71.166	10.166.71.167
118	10.166.71.168/29	10.166.71.169 – 10.166.71.174	10.166.71.175
119	10.166.71.176/29	10.166.71.177 – 10.166.71.182	10.166.71.183
120	10.166.71.184/29	10.166.71.185 – 10.166.71.190	10.166.71.191
121	10.166.71.192/29	10.166.71.193 – 10.166.71.198	10.166.71.199
122	10.166.71.200/29	10.166.71.201 – 10.166.71.206	10.166.71.207
123	10.166.71.208/29	10.166.71.209 – 10.166.71.214	10.166.71.215
124	10.166.71.216/29	10.166.71.217 – 10.166.71.222	10.166.71.223
125	10.166.71.224/29	10.166.71.225 – 10.166.71.230	10.166.71.231
126	10.166.71.232/29	10.166.71.233 – 10.166.71.238	10.166.71.239
127	10.166.71.240/29	10.166.71.241 – 10.166.71.246	10.166.71.247
128	10.166.71.248/29	10.166.71.249 – 10.166.71.254	10.166.71.255

01 / table

IPv4 CIDR prefix table.

Click a prefix longer than your network to split it into subnets.

prefix	subnet mask	addresses	hosts	in your /22
/0	0.0.0.0	4,294,967,296	4,294,967,294	-
/1	128.0.0.0	2,147,483,648	2,147,483,646	-
/2	192.0.0.0	1,073,741,824	1,073,741,822	-
/3	224.0.0.0	536,870,912	536,870,910	-
/4	240.0.0.0	268,435,456	268,435,454	-
/5	248.0.0.0	134,217,728	134,217,726	-
/6	252.0.0.0	67,108,864	67,108,862	-
/7	254.0.0.0	33,554,432	33,554,430	-
/8	255.0.0.0	16,777,216	16,777,214	-
/9	255.128.0.0	8,388,608	8,388,606	-
/10	255.192.0.0	4,194,304	4,194,302	-
/11	255.224.0.0	2,097,152	2,097,150	-
/12	255.240.0.0	1,048,576	1,048,574	-
/13	255.248.0.0	524,288	524,286	-
/14	255.252.0.0	262,144	262,142	-
/15	255.254.0.0	131,072	131,070	-
/16	255.255.0.0	65,536	65,534	-
/17	255.255.128.0	32,768	32,766	-
/18	255.255.192.0	16,384	16,382	-
/19	255.255.224.0	8,192	8,190	-
/20	255.255.240.0	4,096	4,094	-
/21	255.255.248.0	2,048	2,046	-
/22	255.255.252.0	1,024	1,022	1
/23	255.255.254.0	512	510	2 split →
/24	255.255.255.0	256	254	4 split →
/25	255.255.255.128	128	126	8 split →
/26	255.255.255.192	64	62	16 split →
/27	255.255.255.224	32	30	32 split →
/28	255.255.255.240	16	14	64 split →
/29	255.255.255.248	8	6	128 split →
/30	255.255.255.252	4	2	256 split →
/31	255.255.255.254	2	2	512 split →
/32	255.255.255.255	1	1	1,024 split →

02 / faq

About this calculator.

How do I use this subnet calculator?

▼

Type an IP address followed by a prefix, like 192.168.1.10/24, or by a subnet mask, like 192.168.1.10 255.255.255.0. Without a prefix it uses /24. Click a row in the table to split the network into smaller subnets.

Why are usable hosts always 2 fewer?

▼

The first address in a subnet is the network address and the last is the broadcast address, so neither can go to a device. The exceptions are /31 (point-to-point links, RFC 3021) and /32 (a single address), which use every address.

Can I use it from a terminal?

▼

Yes. curl 'ipku.in/en/tools/ipv4-subnet-calculator?q=192.168.1.10/24' returns the result as plain text.

Learn how to work it out →