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)10.167.56.0/24

network10.167.56.0/24

broadcast10.167.56.255

first host10.167.56.1

last host10.167.56.254

subnet mask255.255.255.0

wildcard0.0.0.255

addresses256

usable hosts254

classA

ipcalc 10.167.56.0/24

address00001010.10100111.00111000.00000000

subnet mask11111111.11111111.11111111.00000000

network00001010.10100111.00111000.00000000

broadcast00001010.10100111.00111000.11111111

green = network part, grey = host part

hex0x0aa73800

decimal178731008

reverse dns0.56.167.10.in-addr.arpa

ipv4-mapped::ffff:aa7:3800

/24 split into /31 · 128 subnets

close ×

#	network	host range	broadcast
1	10.167.56.0/31	10.167.56.0 – 10.167.56.1	10.167.56.1
2	10.167.56.2/31	10.167.56.2 – 10.167.56.3	10.167.56.3
3	10.167.56.4/31	10.167.56.4 – 10.167.56.5	10.167.56.5
4	10.167.56.6/31	10.167.56.6 – 10.167.56.7	10.167.56.7
5	10.167.56.8/31	10.167.56.8 – 10.167.56.9	10.167.56.9
6	10.167.56.10/31	10.167.56.10 – 10.167.56.11	10.167.56.11
7	10.167.56.12/31	10.167.56.12 – 10.167.56.13	10.167.56.13
8	10.167.56.14/31	10.167.56.14 – 10.167.56.15	10.167.56.15
9	10.167.56.16/31	10.167.56.16 – 10.167.56.17	10.167.56.17
10	10.167.56.18/31	10.167.56.18 – 10.167.56.19	10.167.56.19
11	10.167.56.20/31	10.167.56.20 – 10.167.56.21	10.167.56.21
12	10.167.56.22/31	10.167.56.22 – 10.167.56.23	10.167.56.23
13	10.167.56.24/31	10.167.56.24 – 10.167.56.25	10.167.56.25
14	10.167.56.26/31	10.167.56.26 – 10.167.56.27	10.167.56.27
15	10.167.56.28/31	10.167.56.28 – 10.167.56.29	10.167.56.29
16	10.167.56.30/31	10.167.56.30 – 10.167.56.31	10.167.56.31
17	10.167.56.32/31	10.167.56.32 – 10.167.56.33	10.167.56.33
18	10.167.56.34/31	10.167.56.34 – 10.167.56.35	10.167.56.35
19	10.167.56.36/31	10.167.56.36 – 10.167.56.37	10.167.56.37
20	10.167.56.38/31	10.167.56.38 – 10.167.56.39	10.167.56.39
21	10.167.56.40/31	10.167.56.40 – 10.167.56.41	10.167.56.41
22	10.167.56.42/31	10.167.56.42 – 10.167.56.43	10.167.56.43
23	10.167.56.44/31	10.167.56.44 – 10.167.56.45	10.167.56.45
24	10.167.56.46/31	10.167.56.46 – 10.167.56.47	10.167.56.47
25	10.167.56.48/31	10.167.56.48 – 10.167.56.49	10.167.56.49
26	10.167.56.50/31	10.167.56.50 – 10.167.56.51	10.167.56.51
27	10.167.56.52/31	10.167.56.52 – 10.167.56.53	10.167.56.53
28	10.167.56.54/31	10.167.56.54 – 10.167.56.55	10.167.56.55
29	10.167.56.56/31	10.167.56.56 – 10.167.56.57	10.167.56.57
30	10.167.56.58/31	10.167.56.58 – 10.167.56.59	10.167.56.59
31	10.167.56.60/31	10.167.56.60 – 10.167.56.61	10.167.56.61
32	10.167.56.62/31	10.167.56.62 – 10.167.56.63	10.167.56.63
33	10.167.56.64/31	10.167.56.64 – 10.167.56.65	10.167.56.65
34	10.167.56.66/31	10.167.56.66 – 10.167.56.67	10.167.56.67
35	10.167.56.68/31	10.167.56.68 – 10.167.56.69	10.167.56.69
36	10.167.56.70/31	10.167.56.70 – 10.167.56.71	10.167.56.71
37	10.167.56.72/31	10.167.56.72 – 10.167.56.73	10.167.56.73
38	10.167.56.74/31	10.167.56.74 – 10.167.56.75	10.167.56.75
39	10.167.56.76/31	10.167.56.76 – 10.167.56.77	10.167.56.77
40	10.167.56.78/31	10.167.56.78 – 10.167.56.79	10.167.56.79
41	10.167.56.80/31	10.167.56.80 – 10.167.56.81	10.167.56.81
42	10.167.56.82/31	10.167.56.82 – 10.167.56.83	10.167.56.83
43	10.167.56.84/31	10.167.56.84 – 10.167.56.85	10.167.56.85
44	10.167.56.86/31	10.167.56.86 – 10.167.56.87	10.167.56.87
45	10.167.56.88/31	10.167.56.88 – 10.167.56.89	10.167.56.89
46	10.167.56.90/31	10.167.56.90 – 10.167.56.91	10.167.56.91
47	10.167.56.92/31	10.167.56.92 – 10.167.56.93	10.167.56.93
48	10.167.56.94/31	10.167.56.94 – 10.167.56.95	10.167.56.95
49	10.167.56.96/31	10.167.56.96 – 10.167.56.97	10.167.56.97
50	10.167.56.98/31	10.167.56.98 – 10.167.56.99	10.167.56.99
51	10.167.56.100/31	10.167.56.100 – 10.167.56.101	10.167.56.101
52	10.167.56.102/31	10.167.56.102 – 10.167.56.103	10.167.56.103
53	10.167.56.104/31	10.167.56.104 – 10.167.56.105	10.167.56.105
54	10.167.56.106/31	10.167.56.106 – 10.167.56.107	10.167.56.107
55	10.167.56.108/31	10.167.56.108 – 10.167.56.109	10.167.56.109
56	10.167.56.110/31	10.167.56.110 – 10.167.56.111	10.167.56.111
57	10.167.56.112/31	10.167.56.112 – 10.167.56.113	10.167.56.113
58	10.167.56.114/31	10.167.56.114 – 10.167.56.115	10.167.56.115
59	10.167.56.116/31	10.167.56.116 – 10.167.56.117	10.167.56.117
60	10.167.56.118/31	10.167.56.118 – 10.167.56.119	10.167.56.119
61	10.167.56.120/31	10.167.56.120 – 10.167.56.121	10.167.56.121
62	10.167.56.122/31	10.167.56.122 – 10.167.56.123	10.167.56.123
63	10.167.56.124/31	10.167.56.124 – 10.167.56.125	10.167.56.125
64	10.167.56.126/31	10.167.56.126 – 10.167.56.127	10.167.56.127
65	10.167.56.128/31	10.167.56.128 – 10.167.56.129	10.167.56.129
66	10.167.56.130/31	10.167.56.130 – 10.167.56.131	10.167.56.131
67	10.167.56.132/31	10.167.56.132 – 10.167.56.133	10.167.56.133
68	10.167.56.134/31	10.167.56.134 – 10.167.56.135	10.167.56.135
69	10.167.56.136/31	10.167.56.136 – 10.167.56.137	10.167.56.137
70	10.167.56.138/31	10.167.56.138 – 10.167.56.139	10.167.56.139
71	10.167.56.140/31	10.167.56.140 – 10.167.56.141	10.167.56.141
72	10.167.56.142/31	10.167.56.142 – 10.167.56.143	10.167.56.143
73	10.167.56.144/31	10.167.56.144 – 10.167.56.145	10.167.56.145
74	10.167.56.146/31	10.167.56.146 – 10.167.56.147	10.167.56.147
75	10.167.56.148/31	10.167.56.148 – 10.167.56.149	10.167.56.149
76	10.167.56.150/31	10.167.56.150 – 10.167.56.151	10.167.56.151
77	10.167.56.152/31	10.167.56.152 – 10.167.56.153	10.167.56.153
78	10.167.56.154/31	10.167.56.154 – 10.167.56.155	10.167.56.155
79	10.167.56.156/31	10.167.56.156 – 10.167.56.157	10.167.56.157
80	10.167.56.158/31	10.167.56.158 – 10.167.56.159	10.167.56.159
81	10.167.56.160/31	10.167.56.160 – 10.167.56.161	10.167.56.161
82	10.167.56.162/31	10.167.56.162 – 10.167.56.163	10.167.56.163
83	10.167.56.164/31	10.167.56.164 – 10.167.56.165	10.167.56.165
84	10.167.56.166/31	10.167.56.166 – 10.167.56.167	10.167.56.167
85	10.167.56.168/31	10.167.56.168 – 10.167.56.169	10.167.56.169
86	10.167.56.170/31	10.167.56.170 – 10.167.56.171	10.167.56.171
87	10.167.56.172/31	10.167.56.172 – 10.167.56.173	10.167.56.173
88	10.167.56.174/31	10.167.56.174 – 10.167.56.175	10.167.56.175
89	10.167.56.176/31	10.167.56.176 – 10.167.56.177	10.167.56.177
90	10.167.56.178/31	10.167.56.178 – 10.167.56.179	10.167.56.179
91	10.167.56.180/31	10.167.56.180 – 10.167.56.181	10.167.56.181
92	10.167.56.182/31	10.167.56.182 – 10.167.56.183	10.167.56.183
93	10.167.56.184/31	10.167.56.184 – 10.167.56.185	10.167.56.185
94	10.167.56.186/31	10.167.56.186 – 10.167.56.187	10.167.56.187
95	10.167.56.188/31	10.167.56.188 – 10.167.56.189	10.167.56.189
96	10.167.56.190/31	10.167.56.190 – 10.167.56.191	10.167.56.191
97	10.167.56.192/31	10.167.56.192 – 10.167.56.193	10.167.56.193
98	10.167.56.194/31	10.167.56.194 – 10.167.56.195	10.167.56.195
99	10.167.56.196/31	10.167.56.196 – 10.167.56.197	10.167.56.197
100	10.167.56.198/31	10.167.56.198 – 10.167.56.199	10.167.56.199
101	10.167.56.200/31	10.167.56.200 – 10.167.56.201	10.167.56.201
102	10.167.56.202/31	10.167.56.202 – 10.167.56.203	10.167.56.203
103	10.167.56.204/31	10.167.56.204 – 10.167.56.205	10.167.56.205
104	10.167.56.206/31	10.167.56.206 – 10.167.56.207	10.167.56.207
105	10.167.56.208/31	10.167.56.208 – 10.167.56.209	10.167.56.209
106	10.167.56.210/31	10.167.56.210 – 10.167.56.211	10.167.56.211
107	10.167.56.212/31	10.167.56.212 – 10.167.56.213	10.167.56.213
108	10.167.56.214/31	10.167.56.214 – 10.167.56.215	10.167.56.215
109	10.167.56.216/31	10.167.56.216 – 10.167.56.217	10.167.56.217
110	10.167.56.218/31	10.167.56.218 – 10.167.56.219	10.167.56.219
111	10.167.56.220/31	10.167.56.220 – 10.167.56.221	10.167.56.221
112	10.167.56.222/31	10.167.56.222 – 10.167.56.223	10.167.56.223
113	10.167.56.224/31	10.167.56.224 – 10.167.56.225	10.167.56.225
114	10.167.56.226/31	10.167.56.226 – 10.167.56.227	10.167.56.227
115	10.167.56.228/31	10.167.56.228 – 10.167.56.229	10.167.56.229
116	10.167.56.230/31	10.167.56.230 – 10.167.56.231	10.167.56.231
117	10.167.56.232/31	10.167.56.232 – 10.167.56.233	10.167.56.233
118	10.167.56.234/31	10.167.56.234 – 10.167.56.235	10.167.56.235
119	10.167.56.236/31	10.167.56.236 – 10.167.56.237	10.167.56.237
120	10.167.56.238/31	10.167.56.238 – 10.167.56.239	10.167.56.239
121	10.167.56.240/31	10.167.56.240 – 10.167.56.241	10.167.56.241
122	10.167.56.242/31	10.167.56.242 – 10.167.56.243	10.167.56.243
123	10.167.56.244/31	10.167.56.244 – 10.167.56.245	10.167.56.245
124	10.167.56.246/31	10.167.56.246 – 10.167.56.247	10.167.56.247
125	10.167.56.248/31	10.167.56.248 – 10.167.56.249	10.167.56.249
126	10.167.56.250/31	10.167.56.250 – 10.167.56.251	10.167.56.251
127	10.167.56.252/31	10.167.56.252 – 10.167.56.253	10.167.56.253
128	10.167.56.254/31	10.167.56.254 – 10.167.56.255	10.167.56.255

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 →