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)10.2.156.0/24

network10.2.156.0/24

broadcast10.2.156.255

first host10.2.156.1

last host10.2.156.254

subnet mask255.255.255.0

wildcard0.0.0.255

addresses256

usable hosts254

classA

ipcalc 10.2.156.0/24

address00001010.00000010.10011100.00000000

subnet mask11111111.11111111.11111111.00000000

network00001010.00000010.10011100.00000000

broadcast00001010.00000010.10011100.11111111

green = network part, grey = host part

hex0x0a029c00

decimal167943168

reverse dns0.156.2.10.in-addr.arpa

ipv4-mapped::ffff:a02:9c00

/24 split into /31 · 128 subnets

close ×

#	network	host range	broadcast
1	10.2.156.0/31	10.2.156.0 – 10.2.156.1	10.2.156.1
2	10.2.156.2/31	10.2.156.2 – 10.2.156.3	10.2.156.3
3	10.2.156.4/31	10.2.156.4 – 10.2.156.5	10.2.156.5
4	10.2.156.6/31	10.2.156.6 – 10.2.156.7	10.2.156.7
5	10.2.156.8/31	10.2.156.8 – 10.2.156.9	10.2.156.9
6	10.2.156.10/31	10.2.156.10 – 10.2.156.11	10.2.156.11
7	10.2.156.12/31	10.2.156.12 – 10.2.156.13	10.2.156.13
8	10.2.156.14/31	10.2.156.14 – 10.2.156.15	10.2.156.15
9	10.2.156.16/31	10.2.156.16 – 10.2.156.17	10.2.156.17
10	10.2.156.18/31	10.2.156.18 – 10.2.156.19	10.2.156.19
11	10.2.156.20/31	10.2.156.20 – 10.2.156.21	10.2.156.21
12	10.2.156.22/31	10.2.156.22 – 10.2.156.23	10.2.156.23
13	10.2.156.24/31	10.2.156.24 – 10.2.156.25	10.2.156.25
14	10.2.156.26/31	10.2.156.26 – 10.2.156.27	10.2.156.27
15	10.2.156.28/31	10.2.156.28 – 10.2.156.29	10.2.156.29
16	10.2.156.30/31	10.2.156.30 – 10.2.156.31	10.2.156.31
17	10.2.156.32/31	10.2.156.32 – 10.2.156.33	10.2.156.33
18	10.2.156.34/31	10.2.156.34 – 10.2.156.35	10.2.156.35
19	10.2.156.36/31	10.2.156.36 – 10.2.156.37	10.2.156.37
20	10.2.156.38/31	10.2.156.38 – 10.2.156.39	10.2.156.39
21	10.2.156.40/31	10.2.156.40 – 10.2.156.41	10.2.156.41
22	10.2.156.42/31	10.2.156.42 – 10.2.156.43	10.2.156.43
23	10.2.156.44/31	10.2.156.44 – 10.2.156.45	10.2.156.45
24	10.2.156.46/31	10.2.156.46 – 10.2.156.47	10.2.156.47
25	10.2.156.48/31	10.2.156.48 – 10.2.156.49	10.2.156.49
26	10.2.156.50/31	10.2.156.50 – 10.2.156.51	10.2.156.51
27	10.2.156.52/31	10.2.156.52 – 10.2.156.53	10.2.156.53
28	10.2.156.54/31	10.2.156.54 – 10.2.156.55	10.2.156.55
29	10.2.156.56/31	10.2.156.56 – 10.2.156.57	10.2.156.57
30	10.2.156.58/31	10.2.156.58 – 10.2.156.59	10.2.156.59
31	10.2.156.60/31	10.2.156.60 – 10.2.156.61	10.2.156.61
32	10.2.156.62/31	10.2.156.62 – 10.2.156.63	10.2.156.63
33	10.2.156.64/31	10.2.156.64 – 10.2.156.65	10.2.156.65
34	10.2.156.66/31	10.2.156.66 – 10.2.156.67	10.2.156.67
35	10.2.156.68/31	10.2.156.68 – 10.2.156.69	10.2.156.69
36	10.2.156.70/31	10.2.156.70 – 10.2.156.71	10.2.156.71
37	10.2.156.72/31	10.2.156.72 – 10.2.156.73	10.2.156.73
38	10.2.156.74/31	10.2.156.74 – 10.2.156.75	10.2.156.75
39	10.2.156.76/31	10.2.156.76 – 10.2.156.77	10.2.156.77
40	10.2.156.78/31	10.2.156.78 – 10.2.156.79	10.2.156.79
41	10.2.156.80/31	10.2.156.80 – 10.2.156.81	10.2.156.81
42	10.2.156.82/31	10.2.156.82 – 10.2.156.83	10.2.156.83
43	10.2.156.84/31	10.2.156.84 – 10.2.156.85	10.2.156.85
44	10.2.156.86/31	10.2.156.86 – 10.2.156.87	10.2.156.87
45	10.2.156.88/31	10.2.156.88 – 10.2.156.89	10.2.156.89
46	10.2.156.90/31	10.2.156.90 – 10.2.156.91	10.2.156.91
47	10.2.156.92/31	10.2.156.92 – 10.2.156.93	10.2.156.93
48	10.2.156.94/31	10.2.156.94 – 10.2.156.95	10.2.156.95
49	10.2.156.96/31	10.2.156.96 – 10.2.156.97	10.2.156.97
50	10.2.156.98/31	10.2.156.98 – 10.2.156.99	10.2.156.99
51	10.2.156.100/31	10.2.156.100 – 10.2.156.101	10.2.156.101
52	10.2.156.102/31	10.2.156.102 – 10.2.156.103	10.2.156.103
53	10.2.156.104/31	10.2.156.104 – 10.2.156.105	10.2.156.105
54	10.2.156.106/31	10.2.156.106 – 10.2.156.107	10.2.156.107
55	10.2.156.108/31	10.2.156.108 – 10.2.156.109	10.2.156.109
56	10.2.156.110/31	10.2.156.110 – 10.2.156.111	10.2.156.111
57	10.2.156.112/31	10.2.156.112 – 10.2.156.113	10.2.156.113
58	10.2.156.114/31	10.2.156.114 – 10.2.156.115	10.2.156.115
59	10.2.156.116/31	10.2.156.116 – 10.2.156.117	10.2.156.117
60	10.2.156.118/31	10.2.156.118 – 10.2.156.119	10.2.156.119
61	10.2.156.120/31	10.2.156.120 – 10.2.156.121	10.2.156.121
62	10.2.156.122/31	10.2.156.122 – 10.2.156.123	10.2.156.123
63	10.2.156.124/31	10.2.156.124 – 10.2.156.125	10.2.156.125
64	10.2.156.126/31	10.2.156.126 – 10.2.156.127	10.2.156.127
65	10.2.156.128/31	10.2.156.128 – 10.2.156.129	10.2.156.129
66	10.2.156.130/31	10.2.156.130 – 10.2.156.131	10.2.156.131
67	10.2.156.132/31	10.2.156.132 – 10.2.156.133	10.2.156.133
68	10.2.156.134/31	10.2.156.134 – 10.2.156.135	10.2.156.135
69	10.2.156.136/31	10.2.156.136 – 10.2.156.137	10.2.156.137
70	10.2.156.138/31	10.2.156.138 – 10.2.156.139	10.2.156.139
71	10.2.156.140/31	10.2.156.140 – 10.2.156.141	10.2.156.141
72	10.2.156.142/31	10.2.156.142 – 10.2.156.143	10.2.156.143
73	10.2.156.144/31	10.2.156.144 – 10.2.156.145	10.2.156.145
74	10.2.156.146/31	10.2.156.146 – 10.2.156.147	10.2.156.147
75	10.2.156.148/31	10.2.156.148 – 10.2.156.149	10.2.156.149
76	10.2.156.150/31	10.2.156.150 – 10.2.156.151	10.2.156.151
77	10.2.156.152/31	10.2.156.152 – 10.2.156.153	10.2.156.153
78	10.2.156.154/31	10.2.156.154 – 10.2.156.155	10.2.156.155
79	10.2.156.156/31	10.2.156.156 – 10.2.156.157	10.2.156.157
80	10.2.156.158/31	10.2.156.158 – 10.2.156.159	10.2.156.159
81	10.2.156.160/31	10.2.156.160 – 10.2.156.161	10.2.156.161
82	10.2.156.162/31	10.2.156.162 – 10.2.156.163	10.2.156.163
83	10.2.156.164/31	10.2.156.164 – 10.2.156.165	10.2.156.165
84	10.2.156.166/31	10.2.156.166 – 10.2.156.167	10.2.156.167
85	10.2.156.168/31	10.2.156.168 – 10.2.156.169	10.2.156.169
86	10.2.156.170/31	10.2.156.170 – 10.2.156.171	10.2.156.171
87	10.2.156.172/31	10.2.156.172 – 10.2.156.173	10.2.156.173
88	10.2.156.174/31	10.2.156.174 – 10.2.156.175	10.2.156.175
89	10.2.156.176/31	10.2.156.176 – 10.2.156.177	10.2.156.177
90	10.2.156.178/31	10.2.156.178 – 10.2.156.179	10.2.156.179
91	10.2.156.180/31	10.2.156.180 – 10.2.156.181	10.2.156.181
92	10.2.156.182/31	10.2.156.182 – 10.2.156.183	10.2.156.183
93	10.2.156.184/31	10.2.156.184 – 10.2.156.185	10.2.156.185
94	10.2.156.186/31	10.2.156.186 – 10.2.156.187	10.2.156.187
95	10.2.156.188/31	10.2.156.188 – 10.2.156.189	10.2.156.189
96	10.2.156.190/31	10.2.156.190 – 10.2.156.191	10.2.156.191
97	10.2.156.192/31	10.2.156.192 – 10.2.156.193	10.2.156.193
98	10.2.156.194/31	10.2.156.194 – 10.2.156.195	10.2.156.195
99	10.2.156.196/31	10.2.156.196 – 10.2.156.197	10.2.156.197
100	10.2.156.198/31	10.2.156.198 – 10.2.156.199	10.2.156.199
101	10.2.156.200/31	10.2.156.200 – 10.2.156.201	10.2.156.201
102	10.2.156.202/31	10.2.156.202 – 10.2.156.203	10.2.156.203
103	10.2.156.204/31	10.2.156.204 – 10.2.156.205	10.2.156.205
104	10.2.156.206/31	10.2.156.206 – 10.2.156.207	10.2.156.207
105	10.2.156.208/31	10.2.156.208 – 10.2.156.209	10.2.156.209
106	10.2.156.210/31	10.2.156.210 – 10.2.156.211	10.2.156.211
107	10.2.156.212/31	10.2.156.212 – 10.2.156.213	10.2.156.213
108	10.2.156.214/31	10.2.156.214 – 10.2.156.215	10.2.156.215
109	10.2.156.216/31	10.2.156.216 – 10.2.156.217	10.2.156.217
110	10.2.156.218/31	10.2.156.218 – 10.2.156.219	10.2.156.219
111	10.2.156.220/31	10.2.156.220 – 10.2.156.221	10.2.156.221
112	10.2.156.222/31	10.2.156.222 – 10.2.156.223	10.2.156.223
113	10.2.156.224/31	10.2.156.224 – 10.2.156.225	10.2.156.225
114	10.2.156.226/31	10.2.156.226 – 10.2.156.227	10.2.156.227
115	10.2.156.228/31	10.2.156.228 – 10.2.156.229	10.2.156.229
116	10.2.156.230/31	10.2.156.230 – 10.2.156.231	10.2.156.231
117	10.2.156.232/31	10.2.156.232 – 10.2.156.233	10.2.156.233
118	10.2.156.234/31	10.2.156.234 – 10.2.156.235	10.2.156.235
119	10.2.156.236/31	10.2.156.236 – 10.2.156.237	10.2.156.237
120	10.2.156.238/31	10.2.156.238 – 10.2.156.239	10.2.156.239
121	10.2.156.240/31	10.2.156.240 – 10.2.156.241	10.2.156.241
122	10.2.156.242/31	10.2.156.242 – 10.2.156.243	10.2.156.243
123	10.2.156.244/31	10.2.156.244 – 10.2.156.245	10.2.156.245
124	10.2.156.246/31	10.2.156.246 – 10.2.156.247	10.2.156.247
125	10.2.156.248/31	10.2.156.248 – 10.2.156.249	10.2.156.249
126	10.2.156.250/31	10.2.156.250 – 10.2.156.251	10.2.156.251
127	10.2.156.252/31	10.2.156.252 – 10.2.156.253	10.2.156.253
128	10.2.156.254/31	10.2.156.254 – 10.2.156.255	10.2.156.255

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 →