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)10.0.37.0/24

network10.0.37.0/24

broadcast10.0.37.255

first host10.0.37.1

last host10.0.37.254

subnet mask255.255.255.0

wildcard0.0.0.255

addresses256

usable hosts254

classA

ipcalc 10.0.37.0/24

address00001010.00000000.00100101.00000000

subnet mask11111111.11111111.11111111.00000000

network00001010.00000000.00100101.00000000

broadcast00001010.00000000.00100101.11111111

green = network part, grey = host part

hex0x0a002500

decimal167781632

reverse dns0.37.0.10.in-addr.arpa

ipv4-mapped::ffff:a00:2500

/24 split into /31 · 128 subnets

close ×

#	network	host range	broadcast
1	10.0.37.0/31	10.0.37.0 – 10.0.37.1	10.0.37.1
2	10.0.37.2/31	10.0.37.2 – 10.0.37.3	10.0.37.3
3	10.0.37.4/31	10.0.37.4 – 10.0.37.5	10.0.37.5
4	10.0.37.6/31	10.0.37.6 – 10.0.37.7	10.0.37.7
5	10.0.37.8/31	10.0.37.8 – 10.0.37.9	10.0.37.9
6	10.0.37.10/31	10.0.37.10 – 10.0.37.11	10.0.37.11
7	10.0.37.12/31	10.0.37.12 – 10.0.37.13	10.0.37.13
8	10.0.37.14/31	10.0.37.14 – 10.0.37.15	10.0.37.15
9	10.0.37.16/31	10.0.37.16 – 10.0.37.17	10.0.37.17
10	10.0.37.18/31	10.0.37.18 – 10.0.37.19	10.0.37.19
11	10.0.37.20/31	10.0.37.20 – 10.0.37.21	10.0.37.21
12	10.0.37.22/31	10.0.37.22 – 10.0.37.23	10.0.37.23
13	10.0.37.24/31	10.0.37.24 – 10.0.37.25	10.0.37.25
14	10.0.37.26/31	10.0.37.26 – 10.0.37.27	10.0.37.27
15	10.0.37.28/31	10.0.37.28 – 10.0.37.29	10.0.37.29
16	10.0.37.30/31	10.0.37.30 – 10.0.37.31	10.0.37.31
17	10.0.37.32/31	10.0.37.32 – 10.0.37.33	10.0.37.33
18	10.0.37.34/31	10.0.37.34 – 10.0.37.35	10.0.37.35
19	10.0.37.36/31	10.0.37.36 – 10.0.37.37	10.0.37.37
20	10.0.37.38/31	10.0.37.38 – 10.0.37.39	10.0.37.39
21	10.0.37.40/31	10.0.37.40 – 10.0.37.41	10.0.37.41
22	10.0.37.42/31	10.0.37.42 – 10.0.37.43	10.0.37.43
23	10.0.37.44/31	10.0.37.44 – 10.0.37.45	10.0.37.45
24	10.0.37.46/31	10.0.37.46 – 10.0.37.47	10.0.37.47
25	10.0.37.48/31	10.0.37.48 – 10.0.37.49	10.0.37.49
26	10.0.37.50/31	10.0.37.50 – 10.0.37.51	10.0.37.51
27	10.0.37.52/31	10.0.37.52 – 10.0.37.53	10.0.37.53
28	10.0.37.54/31	10.0.37.54 – 10.0.37.55	10.0.37.55
29	10.0.37.56/31	10.0.37.56 – 10.0.37.57	10.0.37.57
30	10.0.37.58/31	10.0.37.58 – 10.0.37.59	10.0.37.59
31	10.0.37.60/31	10.0.37.60 – 10.0.37.61	10.0.37.61
32	10.0.37.62/31	10.0.37.62 – 10.0.37.63	10.0.37.63
33	10.0.37.64/31	10.0.37.64 – 10.0.37.65	10.0.37.65
34	10.0.37.66/31	10.0.37.66 – 10.0.37.67	10.0.37.67
35	10.0.37.68/31	10.0.37.68 – 10.0.37.69	10.0.37.69
36	10.0.37.70/31	10.0.37.70 – 10.0.37.71	10.0.37.71
37	10.0.37.72/31	10.0.37.72 – 10.0.37.73	10.0.37.73
38	10.0.37.74/31	10.0.37.74 – 10.0.37.75	10.0.37.75
39	10.0.37.76/31	10.0.37.76 – 10.0.37.77	10.0.37.77
40	10.0.37.78/31	10.0.37.78 – 10.0.37.79	10.0.37.79
41	10.0.37.80/31	10.0.37.80 – 10.0.37.81	10.0.37.81
42	10.0.37.82/31	10.0.37.82 – 10.0.37.83	10.0.37.83
43	10.0.37.84/31	10.0.37.84 – 10.0.37.85	10.0.37.85
44	10.0.37.86/31	10.0.37.86 – 10.0.37.87	10.0.37.87
45	10.0.37.88/31	10.0.37.88 – 10.0.37.89	10.0.37.89
46	10.0.37.90/31	10.0.37.90 – 10.0.37.91	10.0.37.91
47	10.0.37.92/31	10.0.37.92 – 10.0.37.93	10.0.37.93
48	10.0.37.94/31	10.0.37.94 – 10.0.37.95	10.0.37.95
49	10.0.37.96/31	10.0.37.96 – 10.0.37.97	10.0.37.97
50	10.0.37.98/31	10.0.37.98 – 10.0.37.99	10.0.37.99
51	10.0.37.100/31	10.0.37.100 – 10.0.37.101	10.0.37.101
52	10.0.37.102/31	10.0.37.102 – 10.0.37.103	10.0.37.103
53	10.0.37.104/31	10.0.37.104 – 10.0.37.105	10.0.37.105
54	10.0.37.106/31	10.0.37.106 – 10.0.37.107	10.0.37.107
55	10.0.37.108/31	10.0.37.108 – 10.0.37.109	10.0.37.109
56	10.0.37.110/31	10.0.37.110 – 10.0.37.111	10.0.37.111
57	10.0.37.112/31	10.0.37.112 – 10.0.37.113	10.0.37.113
58	10.0.37.114/31	10.0.37.114 – 10.0.37.115	10.0.37.115
59	10.0.37.116/31	10.0.37.116 – 10.0.37.117	10.0.37.117
60	10.0.37.118/31	10.0.37.118 – 10.0.37.119	10.0.37.119
61	10.0.37.120/31	10.0.37.120 – 10.0.37.121	10.0.37.121
62	10.0.37.122/31	10.0.37.122 – 10.0.37.123	10.0.37.123
63	10.0.37.124/31	10.0.37.124 – 10.0.37.125	10.0.37.125
64	10.0.37.126/31	10.0.37.126 – 10.0.37.127	10.0.37.127
65	10.0.37.128/31	10.0.37.128 – 10.0.37.129	10.0.37.129
66	10.0.37.130/31	10.0.37.130 – 10.0.37.131	10.0.37.131
67	10.0.37.132/31	10.0.37.132 – 10.0.37.133	10.0.37.133
68	10.0.37.134/31	10.0.37.134 – 10.0.37.135	10.0.37.135
69	10.0.37.136/31	10.0.37.136 – 10.0.37.137	10.0.37.137
70	10.0.37.138/31	10.0.37.138 – 10.0.37.139	10.0.37.139
71	10.0.37.140/31	10.0.37.140 – 10.0.37.141	10.0.37.141
72	10.0.37.142/31	10.0.37.142 – 10.0.37.143	10.0.37.143
73	10.0.37.144/31	10.0.37.144 – 10.0.37.145	10.0.37.145
74	10.0.37.146/31	10.0.37.146 – 10.0.37.147	10.0.37.147
75	10.0.37.148/31	10.0.37.148 – 10.0.37.149	10.0.37.149
76	10.0.37.150/31	10.0.37.150 – 10.0.37.151	10.0.37.151
77	10.0.37.152/31	10.0.37.152 – 10.0.37.153	10.0.37.153
78	10.0.37.154/31	10.0.37.154 – 10.0.37.155	10.0.37.155
79	10.0.37.156/31	10.0.37.156 – 10.0.37.157	10.0.37.157
80	10.0.37.158/31	10.0.37.158 – 10.0.37.159	10.0.37.159
81	10.0.37.160/31	10.0.37.160 – 10.0.37.161	10.0.37.161
82	10.0.37.162/31	10.0.37.162 – 10.0.37.163	10.0.37.163
83	10.0.37.164/31	10.0.37.164 – 10.0.37.165	10.0.37.165
84	10.0.37.166/31	10.0.37.166 – 10.0.37.167	10.0.37.167
85	10.0.37.168/31	10.0.37.168 – 10.0.37.169	10.0.37.169
86	10.0.37.170/31	10.0.37.170 – 10.0.37.171	10.0.37.171
87	10.0.37.172/31	10.0.37.172 – 10.0.37.173	10.0.37.173
88	10.0.37.174/31	10.0.37.174 – 10.0.37.175	10.0.37.175
89	10.0.37.176/31	10.0.37.176 – 10.0.37.177	10.0.37.177
90	10.0.37.178/31	10.0.37.178 – 10.0.37.179	10.0.37.179
91	10.0.37.180/31	10.0.37.180 – 10.0.37.181	10.0.37.181
92	10.0.37.182/31	10.0.37.182 – 10.0.37.183	10.0.37.183
93	10.0.37.184/31	10.0.37.184 – 10.0.37.185	10.0.37.185
94	10.0.37.186/31	10.0.37.186 – 10.0.37.187	10.0.37.187
95	10.0.37.188/31	10.0.37.188 – 10.0.37.189	10.0.37.189
96	10.0.37.190/31	10.0.37.190 – 10.0.37.191	10.0.37.191
97	10.0.37.192/31	10.0.37.192 – 10.0.37.193	10.0.37.193
98	10.0.37.194/31	10.0.37.194 – 10.0.37.195	10.0.37.195
99	10.0.37.196/31	10.0.37.196 – 10.0.37.197	10.0.37.197
100	10.0.37.198/31	10.0.37.198 – 10.0.37.199	10.0.37.199
101	10.0.37.200/31	10.0.37.200 – 10.0.37.201	10.0.37.201
102	10.0.37.202/31	10.0.37.202 – 10.0.37.203	10.0.37.203
103	10.0.37.204/31	10.0.37.204 – 10.0.37.205	10.0.37.205
104	10.0.37.206/31	10.0.37.206 – 10.0.37.207	10.0.37.207
105	10.0.37.208/31	10.0.37.208 – 10.0.37.209	10.0.37.209
106	10.0.37.210/31	10.0.37.210 – 10.0.37.211	10.0.37.211
107	10.0.37.212/31	10.0.37.212 – 10.0.37.213	10.0.37.213
108	10.0.37.214/31	10.0.37.214 – 10.0.37.215	10.0.37.215
109	10.0.37.216/31	10.0.37.216 – 10.0.37.217	10.0.37.217
110	10.0.37.218/31	10.0.37.218 – 10.0.37.219	10.0.37.219
111	10.0.37.220/31	10.0.37.220 – 10.0.37.221	10.0.37.221
112	10.0.37.222/31	10.0.37.222 – 10.0.37.223	10.0.37.223
113	10.0.37.224/31	10.0.37.224 – 10.0.37.225	10.0.37.225
114	10.0.37.226/31	10.0.37.226 – 10.0.37.227	10.0.37.227
115	10.0.37.228/31	10.0.37.228 – 10.0.37.229	10.0.37.229
116	10.0.37.230/31	10.0.37.230 – 10.0.37.231	10.0.37.231
117	10.0.37.232/31	10.0.37.232 – 10.0.37.233	10.0.37.233
118	10.0.37.234/31	10.0.37.234 – 10.0.37.235	10.0.37.235
119	10.0.37.236/31	10.0.37.236 – 10.0.37.237	10.0.37.237
120	10.0.37.238/31	10.0.37.238 – 10.0.37.239	10.0.37.239
121	10.0.37.240/31	10.0.37.240 – 10.0.37.241	10.0.37.241
122	10.0.37.242/31	10.0.37.242 – 10.0.37.243	10.0.37.243
123	10.0.37.244/31	10.0.37.244 – 10.0.37.245	10.0.37.245
124	10.0.37.246/31	10.0.37.246 – 10.0.37.247	10.0.37.247
125	10.0.37.248/31	10.0.37.248 – 10.0.37.249	10.0.37.249
126	10.0.37.250/31	10.0.37.250 – 10.0.37.251	10.0.37.251
127	10.0.37.252/31	10.0.37.252 – 10.0.37.253	10.0.37.253
128	10.0.37.254/31	10.0.37.254 – 10.0.37.255	10.0.37.255

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 →