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)10.166.22.0/24

network10.166.22.0/24

broadcast10.166.22.255

first host10.166.22.1

last host10.166.22.254

subnet mask255.255.255.0

wildcard0.0.0.255

addresses256

usable hosts254

classA

ipcalc 10.166.22.0/24

address00001010.10100110.00010110.00000000

subnet mask11111111.11111111.11111111.00000000

network00001010.10100110.00010110.00000000

broadcast00001010.10100110.00010110.11111111

green = network part, grey = host part

hex0x0aa61600

decimal178656768

reverse dns0.22.166.10.in-addr.arpa

ipv4-mapped::ffff:aa6:1600

/24 split into /31 · 128 subnets

close ×

#	network	host range	broadcast
1	10.166.22.0/31	10.166.22.0 – 10.166.22.1	10.166.22.1
2	10.166.22.2/31	10.166.22.2 – 10.166.22.3	10.166.22.3
3	10.166.22.4/31	10.166.22.4 – 10.166.22.5	10.166.22.5
4	10.166.22.6/31	10.166.22.6 – 10.166.22.7	10.166.22.7
5	10.166.22.8/31	10.166.22.8 – 10.166.22.9	10.166.22.9
6	10.166.22.10/31	10.166.22.10 – 10.166.22.11	10.166.22.11
7	10.166.22.12/31	10.166.22.12 – 10.166.22.13	10.166.22.13
8	10.166.22.14/31	10.166.22.14 – 10.166.22.15	10.166.22.15
9	10.166.22.16/31	10.166.22.16 – 10.166.22.17	10.166.22.17
10	10.166.22.18/31	10.166.22.18 – 10.166.22.19	10.166.22.19
11	10.166.22.20/31	10.166.22.20 – 10.166.22.21	10.166.22.21
12	10.166.22.22/31	10.166.22.22 – 10.166.22.23	10.166.22.23
13	10.166.22.24/31	10.166.22.24 – 10.166.22.25	10.166.22.25
14	10.166.22.26/31	10.166.22.26 – 10.166.22.27	10.166.22.27
15	10.166.22.28/31	10.166.22.28 – 10.166.22.29	10.166.22.29
16	10.166.22.30/31	10.166.22.30 – 10.166.22.31	10.166.22.31
17	10.166.22.32/31	10.166.22.32 – 10.166.22.33	10.166.22.33
18	10.166.22.34/31	10.166.22.34 – 10.166.22.35	10.166.22.35
19	10.166.22.36/31	10.166.22.36 – 10.166.22.37	10.166.22.37
20	10.166.22.38/31	10.166.22.38 – 10.166.22.39	10.166.22.39
21	10.166.22.40/31	10.166.22.40 – 10.166.22.41	10.166.22.41
22	10.166.22.42/31	10.166.22.42 – 10.166.22.43	10.166.22.43
23	10.166.22.44/31	10.166.22.44 – 10.166.22.45	10.166.22.45
24	10.166.22.46/31	10.166.22.46 – 10.166.22.47	10.166.22.47
25	10.166.22.48/31	10.166.22.48 – 10.166.22.49	10.166.22.49
26	10.166.22.50/31	10.166.22.50 – 10.166.22.51	10.166.22.51
27	10.166.22.52/31	10.166.22.52 – 10.166.22.53	10.166.22.53
28	10.166.22.54/31	10.166.22.54 – 10.166.22.55	10.166.22.55
29	10.166.22.56/31	10.166.22.56 – 10.166.22.57	10.166.22.57
30	10.166.22.58/31	10.166.22.58 – 10.166.22.59	10.166.22.59
31	10.166.22.60/31	10.166.22.60 – 10.166.22.61	10.166.22.61
32	10.166.22.62/31	10.166.22.62 – 10.166.22.63	10.166.22.63
33	10.166.22.64/31	10.166.22.64 – 10.166.22.65	10.166.22.65
34	10.166.22.66/31	10.166.22.66 – 10.166.22.67	10.166.22.67
35	10.166.22.68/31	10.166.22.68 – 10.166.22.69	10.166.22.69
36	10.166.22.70/31	10.166.22.70 – 10.166.22.71	10.166.22.71
37	10.166.22.72/31	10.166.22.72 – 10.166.22.73	10.166.22.73
38	10.166.22.74/31	10.166.22.74 – 10.166.22.75	10.166.22.75
39	10.166.22.76/31	10.166.22.76 – 10.166.22.77	10.166.22.77
40	10.166.22.78/31	10.166.22.78 – 10.166.22.79	10.166.22.79
41	10.166.22.80/31	10.166.22.80 – 10.166.22.81	10.166.22.81
42	10.166.22.82/31	10.166.22.82 – 10.166.22.83	10.166.22.83
43	10.166.22.84/31	10.166.22.84 – 10.166.22.85	10.166.22.85
44	10.166.22.86/31	10.166.22.86 – 10.166.22.87	10.166.22.87
45	10.166.22.88/31	10.166.22.88 – 10.166.22.89	10.166.22.89
46	10.166.22.90/31	10.166.22.90 – 10.166.22.91	10.166.22.91
47	10.166.22.92/31	10.166.22.92 – 10.166.22.93	10.166.22.93
48	10.166.22.94/31	10.166.22.94 – 10.166.22.95	10.166.22.95
49	10.166.22.96/31	10.166.22.96 – 10.166.22.97	10.166.22.97
50	10.166.22.98/31	10.166.22.98 – 10.166.22.99	10.166.22.99
51	10.166.22.100/31	10.166.22.100 – 10.166.22.101	10.166.22.101
52	10.166.22.102/31	10.166.22.102 – 10.166.22.103	10.166.22.103
53	10.166.22.104/31	10.166.22.104 – 10.166.22.105	10.166.22.105
54	10.166.22.106/31	10.166.22.106 – 10.166.22.107	10.166.22.107
55	10.166.22.108/31	10.166.22.108 – 10.166.22.109	10.166.22.109
56	10.166.22.110/31	10.166.22.110 – 10.166.22.111	10.166.22.111
57	10.166.22.112/31	10.166.22.112 – 10.166.22.113	10.166.22.113
58	10.166.22.114/31	10.166.22.114 – 10.166.22.115	10.166.22.115
59	10.166.22.116/31	10.166.22.116 – 10.166.22.117	10.166.22.117
60	10.166.22.118/31	10.166.22.118 – 10.166.22.119	10.166.22.119
61	10.166.22.120/31	10.166.22.120 – 10.166.22.121	10.166.22.121
62	10.166.22.122/31	10.166.22.122 – 10.166.22.123	10.166.22.123
63	10.166.22.124/31	10.166.22.124 – 10.166.22.125	10.166.22.125
64	10.166.22.126/31	10.166.22.126 – 10.166.22.127	10.166.22.127
65	10.166.22.128/31	10.166.22.128 – 10.166.22.129	10.166.22.129
66	10.166.22.130/31	10.166.22.130 – 10.166.22.131	10.166.22.131
67	10.166.22.132/31	10.166.22.132 – 10.166.22.133	10.166.22.133
68	10.166.22.134/31	10.166.22.134 – 10.166.22.135	10.166.22.135
69	10.166.22.136/31	10.166.22.136 – 10.166.22.137	10.166.22.137
70	10.166.22.138/31	10.166.22.138 – 10.166.22.139	10.166.22.139
71	10.166.22.140/31	10.166.22.140 – 10.166.22.141	10.166.22.141
72	10.166.22.142/31	10.166.22.142 – 10.166.22.143	10.166.22.143
73	10.166.22.144/31	10.166.22.144 – 10.166.22.145	10.166.22.145
74	10.166.22.146/31	10.166.22.146 – 10.166.22.147	10.166.22.147
75	10.166.22.148/31	10.166.22.148 – 10.166.22.149	10.166.22.149
76	10.166.22.150/31	10.166.22.150 – 10.166.22.151	10.166.22.151
77	10.166.22.152/31	10.166.22.152 – 10.166.22.153	10.166.22.153
78	10.166.22.154/31	10.166.22.154 – 10.166.22.155	10.166.22.155
79	10.166.22.156/31	10.166.22.156 – 10.166.22.157	10.166.22.157
80	10.166.22.158/31	10.166.22.158 – 10.166.22.159	10.166.22.159
81	10.166.22.160/31	10.166.22.160 – 10.166.22.161	10.166.22.161
82	10.166.22.162/31	10.166.22.162 – 10.166.22.163	10.166.22.163
83	10.166.22.164/31	10.166.22.164 – 10.166.22.165	10.166.22.165
84	10.166.22.166/31	10.166.22.166 – 10.166.22.167	10.166.22.167
85	10.166.22.168/31	10.166.22.168 – 10.166.22.169	10.166.22.169
86	10.166.22.170/31	10.166.22.170 – 10.166.22.171	10.166.22.171
87	10.166.22.172/31	10.166.22.172 – 10.166.22.173	10.166.22.173
88	10.166.22.174/31	10.166.22.174 – 10.166.22.175	10.166.22.175
89	10.166.22.176/31	10.166.22.176 – 10.166.22.177	10.166.22.177
90	10.166.22.178/31	10.166.22.178 – 10.166.22.179	10.166.22.179
91	10.166.22.180/31	10.166.22.180 – 10.166.22.181	10.166.22.181
92	10.166.22.182/31	10.166.22.182 – 10.166.22.183	10.166.22.183
93	10.166.22.184/31	10.166.22.184 – 10.166.22.185	10.166.22.185
94	10.166.22.186/31	10.166.22.186 – 10.166.22.187	10.166.22.187
95	10.166.22.188/31	10.166.22.188 – 10.166.22.189	10.166.22.189
96	10.166.22.190/31	10.166.22.190 – 10.166.22.191	10.166.22.191
97	10.166.22.192/31	10.166.22.192 – 10.166.22.193	10.166.22.193
98	10.166.22.194/31	10.166.22.194 – 10.166.22.195	10.166.22.195
99	10.166.22.196/31	10.166.22.196 – 10.166.22.197	10.166.22.197
100	10.166.22.198/31	10.166.22.198 – 10.166.22.199	10.166.22.199
101	10.166.22.200/31	10.166.22.200 – 10.166.22.201	10.166.22.201
102	10.166.22.202/31	10.166.22.202 – 10.166.22.203	10.166.22.203
103	10.166.22.204/31	10.166.22.204 – 10.166.22.205	10.166.22.205
104	10.166.22.206/31	10.166.22.206 – 10.166.22.207	10.166.22.207
105	10.166.22.208/31	10.166.22.208 – 10.166.22.209	10.166.22.209
106	10.166.22.210/31	10.166.22.210 – 10.166.22.211	10.166.22.211
107	10.166.22.212/31	10.166.22.212 – 10.166.22.213	10.166.22.213
108	10.166.22.214/31	10.166.22.214 – 10.166.22.215	10.166.22.215
109	10.166.22.216/31	10.166.22.216 – 10.166.22.217	10.166.22.217
110	10.166.22.218/31	10.166.22.218 – 10.166.22.219	10.166.22.219
111	10.166.22.220/31	10.166.22.220 – 10.166.22.221	10.166.22.221
112	10.166.22.222/31	10.166.22.222 – 10.166.22.223	10.166.22.223
113	10.166.22.224/31	10.166.22.224 – 10.166.22.225	10.166.22.225
114	10.166.22.226/31	10.166.22.226 – 10.166.22.227	10.166.22.227
115	10.166.22.228/31	10.166.22.228 – 10.166.22.229	10.166.22.229
116	10.166.22.230/31	10.166.22.230 – 10.166.22.231	10.166.22.231
117	10.166.22.232/31	10.166.22.232 – 10.166.22.233	10.166.22.233
118	10.166.22.234/31	10.166.22.234 – 10.166.22.235	10.166.22.235
119	10.166.22.236/31	10.166.22.236 – 10.166.22.237	10.166.22.237
120	10.166.22.238/31	10.166.22.238 – 10.166.22.239	10.166.22.239
121	10.166.22.240/31	10.166.22.240 – 10.166.22.241	10.166.22.241
122	10.166.22.242/31	10.166.22.242 – 10.166.22.243	10.166.22.243
123	10.166.22.244/31	10.166.22.244 – 10.166.22.245	10.166.22.245
124	10.166.22.246/31	10.166.22.246 – 10.166.22.247	10.166.22.247
125	10.166.22.248/31	10.166.22.248 – 10.166.22.249	10.166.22.249
126	10.166.22.250/31	10.166.22.250 – 10.166.22.251	10.166.22.251
127	10.166.22.252/31	10.166.22.252 – 10.166.22.253	10.166.22.253
128	10.166.22.254/31	10.166.22.254 – 10.166.22.255	10.166.22.255

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 /24
/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	-
/23	255.255.254.0	512	510	-
/24	255.255.255.0	256	254	1
/25	255.255.255.128	128	126	2 split →
/26	255.255.255.192	64	62	4 split →
/27	255.255.255.224	32	30	8 split →
/28	255.255.255.240	16	14	16 split →
/29	255.255.255.248	8	6	32 split →
/30	255.255.255.252	4	2	64 split →
/31	255.255.255.254	2	2	128 split →
/32	255.255.255.255	1	1	256 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 →