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)10.2.237.0/24

network10.2.237.0/24

broadcast10.2.237.255

first host10.2.237.1

last host10.2.237.254

subnet mask255.255.255.0

wildcard0.0.0.255

addresses256

usable hosts254

classA

ipcalc 10.2.237.0/24

address00001010.00000010.11101101.00000000

subnet mask11111111.11111111.11111111.00000000

network00001010.00000010.11101101.00000000

broadcast00001010.00000010.11101101.11111111

green = network part, grey = host part

hex0x0a02ed00

decimal167963904

reverse dns0.237.2.10.in-addr.arpa

ipv4-mapped::ffff:a02:ed00

/24 split into /31 · 128 subnets

close ×

#	network	host range	broadcast
1	10.2.237.0/31	10.2.237.0 – 10.2.237.1	10.2.237.1
2	10.2.237.2/31	10.2.237.2 – 10.2.237.3	10.2.237.3
3	10.2.237.4/31	10.2.237.4 – 10.2.237.5	10.2.237.5
4	10.2.237.6/31	10.2.237.6 – 10.2.237.7	10.2.237.7
5	10.2.237.8/31	10.2.237.8 – 10.2.237.9	10.2.237.9
6	10.2.237.10/31	10.2.237.10 – 10.2.237.11	10.2.237.11
7	10.2.237.12/31	10.2.237.12 – 10.2.237.13	10.2.237.13
8	10.2.237.14/31	10.2.237.14 – 10.2.237.15	10.2.237.15
9	10.2.237.16/31	10.2.237.16 – 10.2.237.17	10.2.237.17
10	10.2.237.18/31	10.2.237.18 – 10.2.237.19	10.2.237.19
11	10.2.237.20/31	10.2.237.20 – 10.2.237.21	10.2.237.21
12	10.2.237.22/31	10.2.237.22 – 10.2.237.23	10.2.237.23
13	10.2.237.24/31	10.2.237.24 – 10.2.237.25	10.2.237.25
14	10.2.237.26/31	10.2.237.26 – 10.2.237.27	10.2.237.27
15	10.2.237.28/31	10.2.237.28 – 10.2.237.29	10.2.237.29
16	10.2.237.30/31	10.2.237.30 – 10.2.237.31	10.2.237.31
17	10.2.237.32/31	10.2.237.32 – 10.2.237.33	10.2.237.33
18	10.2.237.34/31	10.2.237.34 – 10.2.237.35	10.2.237.35
19	10.2.237.36/31	10.2.237.36 – 10.2.237.37	10.2.237.37
20	10.2.237.38/31	10.2.237.38 – 10.2.237.39	10.2.237.39
21	10.2.237.40/31	10.2.237.40 – 10.2.237.41	10.2.237.41
22	10.2.237.42/31	10.2.237.42 – 10.2.237.43	10.2.237.43
23	10.2.237.44/31	10.2.237.44 – 10.2.237.45	10.2.237.45
24	10.2.237.46/31	10.2.237.46 – 10.2.237.47	10.2.237.47
25	10.2.237.48/31	10.2.237.48 – 10.2.237.49	10.2.237.49
26	10.2.237.50/31	10.2.237.50 – 10.2.237.51	10.2.237.51
27	10.2.237.52/31	10.2.237.52 – 10.2.237.53	10.2.237.53
28	10.2.237.54/31	10.2.237.54 – 10.2.237.55	10.2.237.55
29	10.2.237.56/31	10.2.237.56 – 10.2.237.57	10.2.237.57
30	10.2.237.58/31	10.2.237.58 – 10.2.237.59	10.2.237.59
31	10.2.237.60/31	10.2.237.60 – 10.2.237.61	10.2.237.61
32	10.2.237.62/31	10.2.237.62 – 10.2.237.63	10.2.237.63
33	10.2.237.64/31	10.2.237.64 – 10.2.237.65	10.2.237.65
34	10.2.237.66/31	10.2.237.66 – 10.2.237.67	10.2.237.67
35	10.2.237.68/31	10.2.237.68 – 10.2.237.69	10.2.237.69
36	10.2.237.70/31	10.2.237.70 – 10.2.237.71	10.2.237.71
37	10.2.237.72/31	10.2.237.72 – 10.2.237.73	10.2.237.73
38	10.2.237.74/31	10.2.237.74 – 10.2.237.75	10.2.237.75
39	10.2.237.76/31	10.2.237.76 – 10.2.237.77	10.2.237.77
40	10.2.237.78/31	10.2.237.78 – 10.2.237.79	10.2.237.79
41	10.2.237.80/31	10.2.237.80 – 10.2.237.81	10.2.237.81
42	10.2.237.82/31	10.2.237.82 – 10.2.237.83	10.2.237.83
43	10.2.237.84/31	10.2.237.84 – 10.2.237.85	10.2.237.85
44	10.2.237.86/31	10.2.237.86 – 10.2.237.87	10.2.237.87
45	10.2.237.88/31	10.2.237.88 – 10.2.237.89	10.2.237.89
46	10.2.237.90/31	10.2.237.90 – 10.2.237.91	10.2.237.91
47	10.2.237.92/31	10.2.237.92 – 10.2.237.93	10.2.237.93
48	10.2.237.94/31	10.2.237.94 – 10.2.237.95	10.2.237.95
49	10.2.237.96/31	10.2.237.96 – 10.2.237.97	10.2.237.97
50	10.2.237.98/31	10.2.237.98 – 10.2.237.99	10.2.237.99
51	10.2.237.100/31	10.2.237.100 – 10.2.237.101	10.2.237.101
52	10.2.237.102/31	10.2.237.102 – 10.2.237.103	10.2.237.103
53	10.2.237.104/31	10.2.237.104 – 10.2.237.105	10.2.237.105
54	10.2.237.106/31	10.2.237.106 – 10.2.237.107	10.2.237.107
55	10.2.237.108/31	10.2.237.108 – 10.2.237.109	10.2.237.109
56	10.2.237.110/31	10.2.237.110 – 10.2.237.111	10.2.237.111
57	10.2.237.112/31	10.2.237.112 – 10.2.237.113	10.2.237.113
58	10.2.237.114/31	10.2.237.114 – 10.2.237.115	10.2.237.115
59	10.2.237.116/31	10.2.237.116 – 10.2.237.117	10.2.237.117
60	10.2.237.118/31	10.2.237.118 – 10.2.237.119	10.2.237.119
61	10.2.237.120/31	10.2.237.120 – 10.2.237.121	10.2.237.121
62	10.2.237.122/31	10.2.237.122 – 10.2.237.123	10.2.237.123
63	10.2.237.124/31	10.2.237.124 – 10.2.237.125	10.2.237.125
64	10.2.237.126/31	10.2.237.126 – 10.2.237.127	10.2.237.127
65	10.2.237.128/31	10.2.237.128 – 10.2.237.129	10.2.237.129
66	10.2.237.130/31	10.2.237.130 – 10.2.237.131	10.2.237.131
67	10.2.237.132/31	10.2.237.132 – 10.2.237.133	10.2.237.133
68	10.2.237.134/31	10.2.237.134 – 10.2.237.135	10.2.237.135
69	10.2.237.136/31	10.2.237.136 – 10.2.237.137	10.2.237.137
70	10.2.237.138/31	10.2.237.138 – 10.2.237.139	10.2.237.139
71	10.2.237.140/31	10.2.237.140 – 10.2.237.141	10.2.237.141
72	10.2.237.142/31	10.2.237.142 – 10.2.237.143	10.2.237.143
73	10.2.237.144/31	10.2.237.144 – 10.2.237.145	10.2.237.145
74	10.2.237.146/31	10.2.237.146 – 10.2.237.147	10.2.237.147
75	10.2.237.148/31	10.2.237.148 – 10.2.237.149	10.2.237.149
76	10.2.237.150/31	10.2.237.150 – 10.2.237.151	10.2.237.151
77	10.2.237.152/31	10.2.237.152 – 10.2.237.153	10.2.237.153
78	10.2.237.154/31	10.2.237.154 – 10.2.237.155	10.2.237.155
79	10.2.237.156/31	10.2.237.156 – 10.2.237.157	10.2.237.157
80	10.2.237.158/31	10.2.237.158 – 10.2.237.159	10.2.237.159
81	10.2.237.160/31	10.2.237.160 – 10.2.237.161	10.2.237.161
82	10.2.237.162/31	10.2.237.162 – 10.2.237.163	10.2.237.163
83	10.2.237.164/31	10.2.237.164 – 10.2.237.165	10.2.237.165
84	10.2.237.166/31	10.2.237.166 – 10.2.237.167	10.2.237.167
85	10.2.237.168/31	10.2.237.168 – 10.2.237.169	10.2.237.169
86	10.2.237.170/31	10.2.237.170 – 10.2.237.171	10.2.237.171
87	10.2.237.172/31	10.2.237.172 – 10.2.237.173	10.2.237.173
88	10.2.237.174/31	10.2.237.174 – 10.2.237.175	10.2.237.175
89	10.2.237.176/31	10.2.237.176 – 10.2.237.177	10.2.237.177
90	10.2.237.178/31	10.2.237.178 – 10.2.237.179	10.2.237.179
91	10.2.237.180/31	10.2.237.180 – 10.2.237.181	10.2.237.181
92	10.2.237.182/31	10.2.237.182 – 10.2.237.183	10.2.237.183
93	10.2.237.184/31	10.2.237.184 – 10.2.237.185	10.2.237.185
94	10.2.237.186/31	10.2.237.186 – 10.2.237.187	10.2.237.187
95	10.2.237.188/31	10.2.237.188 – 10.2.237.189	10.2.237.189
96	10.2.237.190/31	10.2.237.190 – 10.2.237.191	10.2.237.191
97	10.2.237.192/31	10.2.237.192 – 10.2.237.193	10.2.237.193
98	10.2.237.194/31	10.2.237.194 – 10.2.237.195	10.2.237.195
99	10.2.237.196/31	10.2.237.196 – 10.2.237.197	10.2.237.197
100	10.2.237.198/31	10.2.237.198 – 10.2.237.199	10.2.237.199
101	10.2.237.200/31	10.2.237.200 – 10.2.237.201	10.2.237.201
102	10.2.237.202/31	10.2.237.202 – 10.2.237.203	10.2.237.203
103	10.2.237.204/31	10.2.237.204 – 10.2.237.205	10.2.237.205
104	10.2.237.206/31	10.2.237.206 – 10.2.237.207	10.2.237.207
105	10.2.237.208/31	10.2.237.208 – 10.2.237.209	10.2.237.209
106	10.2.237.210/31	10.2.237.210 – 10.2.237.211	10.2.237.211
107	10.2.237.212/31	10.2.237.212 – 10.2.237.213	10.2.237.213
108	10.2.237.214/31	10.2.237.214 – 10.2.237.215	10.2.237.215
109	10.2.237.216/31	10.2.237.216 – 10.2.237.217	10.2.237.217
110	10.2.237.218/31	10.2.237.218 – 10.2.237.219	10.2.237.219
111	10.2.237.220/31	10.2.237.220 – 10.2.237.221	10.2.237.221
112	10.2.237.222/31	10.2.237.222 – 10.2.237.223	10.2.237.223
113	10.2.237.224/31	10.2.237.224 – 10.2.237.225	10.2.237.225
114	10.2.237.226/31	10.2.237.226 – 10.2.237.227	10.2.237.227
115	10.2.237.228/31	10.2.237.228 – 10.2.237.229	10.2.237.229
116	10.2.237.230/31	10.2.237.230 – 10.2.237.231	10.2.237.231
117	10.2.237.232/31	10.2.237.232 – 10.2.237.233	10.2.237.233
118	10.2.237.234/31	10.2.237.234 – 10.2.237.235	10.2.237.235
119	10.2.237.236/31	10.2.237.236 – 10.2.237.237	10.2.237.237
120	10.2.237.238/31	10.2.237.238 – 10.2.237.239	10.2.237.239
121	10.2.237.240/31	10.2.237.240 – 10.2.237.241	10.2.237.241
122	10.2.237.242/31	10.2.237.242 – 10.2.237.243	10.2.237.243
123	10.2.237.244/31	10.2.237.244 – 10.2.237.245	10.2.237.245
124	10.2.237.246/31	10.2.237.246 – 10.2.237.247	10.2.237.247
125	10.2.237.248/31	10.2.237.248 – 10.2.237.249	10.2.237.249
126	10.2.237.250/31	10.2.237.250 – 10.2.237.251	10.2.237.251
127	10.2.237.252/31	10.2.237.252 – 10.2.237.253	10.2.237.253
128	10.2.237.254/31	10.2.237.254 – 10.2.237.255	10.2.237.255

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 →