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)10.78.237.0/24

network10.78.237.0/24

broadcast10.78.237.255

first host10.78.237.1

last host10.78.237.254

subnet mask255.255.255.0

wildcard0.0.0.255

addresses256

usable hosts254

classA

ipcalc 10.78.237.0/24

address00001010.01001110.11101101.00000000

subnet mask11111111.11111111.11111111.00000000

network00001010.01001110.11101101.00000000

broadcast00001010.01001110.11101101.11111111

green = network part, grey = host part

hex0x0a4eed00

decimal172944640

reverse dns0.237.78.10.in-addr.arpa

ipv4-mapped::ffff:a4e:ed00

/24 split into /31 · 128 subnets

close ×

#	network	host range	broadcast
1	10.78.237.0/31	10.78.237.0 – 10.78.237.1	10.78.237.1
2	10.78.237.2/31	10.78.237.2 – 10.78.237.3	10.78.237.3
3	10.78.237.4/31	10.78.237.4 – 10.78.237.5	10.78.237.5
4	10.78.237.6/31	10.78.237.6 – 10.78.237.7	10.78.237.7
5	10.78.237.8/31	10.78.237.8 – 10.78.237.9	10.78.237.9
6	10.78.237.10/31	10.78.237.10 – 10.78.237.11	10.78.237.11
7	10.78.237.12/31	10.78.237.12 – 10.78.237.13	10.78.237.13
8	10.78.237.14/31	10.78.237.14 – 10.78.237.15	10.78.237.15
9	10.78.237.16/31	10.78.237.16 – 10.78.237.17	10.78.237.17
10	10.78.237.18/31	10.78.237.18 – 10.78.237.19	10.78.237.19
11	10.78.237.20/31	10.78.237.20 – 10.78.237.21	10.78.237.21
12	10.78.237.22/31	10.78.237.22 – 10.78.237.23	10.78.237.23
13	10.78.237.24/31	10.78.237.24 – 10.78.237.25	10.78.237.25
14	10.78.237.26/31	10.78.237.26 – 10.78.237.27	10.78.237.27
15	10.78.237.28/31	10.78.237.28 – 10.78.237.29	10.78.237.29
16	10.78.237.30/31	10.78.237.30 – 10.78.237.31	10.78.237.31
17	10.78.237.32/31	10.78.237.32 – 10.78.237.33	10.78.237.33
18	10.78.237.34/31	10.78.237.34 – 10.78.237.35	10.78.237.35
19	10.78.237.36/31	10.78.237.36 – 10.78.237.37	10.78.237.37
20	10.78.237.38/31	10.78.237.38 – 10.78.237.39	10.78.237.39
21	10.78.237.40/31	10.78.237.40 – 10.78.237.41	10.78.237.41
22	10.78.237.42/31	10.78.237.42 – 10.78.237.43	10.78.237.43
23	10.78.237.44/31	10.78.237.44 – 10.78.237.45	10.78.237.45
24	10.78.237.46/31	10.78.237.46 – 10.78.237.47	10.78.237.47
25	10.78.237.48/31	10.78.237.48 – 10.78.237.49	10.78.237.49
26	10.78.237.50/31	10.78.237.50 – 10.78.237.51	10.78.237.51
27	10.78.237.52/31	10.78.237.52 – 10.78.237.53	10.78.237.53
28	10.78.237.54/31	10.78.237.54 – 10.78.237.55	10.78.237.55
29	10.78.237.56/31	10.78.237.56 – 10.78.237.57	10.78.237.57
30	10.78.237.58/31	10.78.237.58 – 10.78.237.59	10.78.237.59
31	10.78.237.60/31	10.78.237.60 – 10.78.237.61	10.78.237.61
32	10.78.237.62/31	10.78.237.62 – 10.78.237.63	10.78.237.63
33	10.78.237.64/31	10.78.237.64 – 10.78.237.65	10.78.237.65
34	10.78.237.66/31	10.78.237.66 – 10.78.237.67	10.78.237.67
35	10.78.237.68/31	10.78.237.68 – 10.78.237.69	10.78.237.69
36	10.78.237.70/31	10.78.237.70 – 10.78.237.71	10.78.237.71
37	10.78.237.72/31	10.78.237.72 – 10.78.237.73	10.78.237.73
38	10.78.237.74/31	10.78.237.74 – 10.78.237.75	10.78.237.75
39	10.78.237.76/31	10.78.237.76 – 10.78.237.77	10.78.237.77
40	10.78.237.78/31	10.78.237.78 – 10.78.237.79	10.78.237.79
41	10.78.237.80/31	10.78.237.80 – 10.78.237.81	10.78.237.81
42	10.78.237.82/31	10.78.237.82 – 10.78.237.83	10.78.237.83
43	10.78.237.84/31	10.78.237.84 – 10.78.237.85	10.78.237.85
44	10.78.237.86/31	10.78.237.86 – 10.78.237.87	10.78.237.87
45	10.78.237.88/31	10.78.237.88 – 10.78.237.89	10.78.237.89
46	10.78.237.90/31	10.78.237.90 – 10.78.237.91	10.78.237.91
47	10.78.237.92/31	10.78.237.92 – 10.78.237.93	10.78.237.93
48	10.78.237.94/31	10.78.237.94 – 10.78.237.95	10.78.237.95
49	10.78.237.96/31	10.78.237.96 – 10.78.237.97	10.78.237.97
50	10.78.237.98/31	10.78.237.98 – 10.78.237.99	10.78.237.99
51	10.78.237.100/31	10.78.237.100 – 10.78.237.101	10.78.237.101
52	10.78.237.102/31	10.78.237.102 – 10.78.237.103	10.78.237.103
53	10.78.237.104/31	10.78.237.104 – 10.78.237.105	10.78.237.105
54	10.78.237.106/31	10.78.237.106 – 10.78.237.107	10.78.237.107
55	10.78.237.108/31	10.78.237.108 – 10.78.237.109	10.78.237.109
56	10.78.237.110/31	10.78.237.110 – 10.78.237.111	10.78.237.111
57	10.78.237.112/31	10.78.237.112 – 10.78.237.113	10.78.237.113
58	10.78.237.114/31	10.78.237.114 – 10.78.237.115	10.78.237.115
59	10.78.237.116/31	10.78.237.116 – 10.78.237.117	10.78.237.117
60	10.78.237.118/31	10.78.237.118 – 10.78.237.119	10.78.237.119
61	10.78.237.120/31	10.78.237.120 – 10.78.237.121	10.78.237.121
62	10.78.237.122/31	10.78.237.122 – 10.78.237.123	10.78.237.123
63	10.78.237.124/31	10.78.237.124 – 10.78.237.125	10.78.237.125
64	10.78.237.126/31	10.78.237.126 – 10.78.237.127	10.78.237.127
65	10.78.237.128/31	10.78.237.128 – 10.78.237.129	10.78.237.129
66	10.78.237.130/31	10.78.237.130 – 10.78.237.131	10.78.237.131
67	10.78.237.132/31	10.78.237.132 – 10.78.237.133	10.78.237.133
68	10.78.237.134/31	10.78.237.134 – 10.78.237.135	10.78.237.135
69	10.78.237.136/31	10.78.237.136 – 10.78.237.137	10.78.237.137
70	10.78.237.138/31	10.78.237.138 – 10.78.237.139	10.78.237.139
71	10.78.237.140/31	10.78.237.140 – 10.78.237.141	10.78.237.141
72	10.78.237.142/31	10.78.237.142 – 10.78.237.143	10.78.237.143
73	10.78.237.144/31	10.78.237.144 – 10.78.237.145	10.78.237.145
74	10.78.237.146/31	10.78.237.146 – 10.78.237.147	10.78.237.147
75	10.78.237.148/31	10.78.237.148 – 10.78.237.149	10.78.237.149
76	10.78.237.150/31	10.78.237.150 – 10.78.237.151	10.78.237.151
77	10.78.237.152/31	10.78.237.152 – 10.78.237.153	10.78.237.153
78	10.78.237.154/31	10.78.237.154 – 10.78.237.155	10.78.237.155
79	10.78.237.156/31	10.78.237.156 – 10.78.237.157	10.78.237.157
80	10.78.237.158/31	10.78.237.158 – 10.78.237.159	10.78.237.159
81	10.78.237.160/31	10.78.237.160 – 10.78.237.161	10.78.237.161
82	10.78.237.162/31	10.78.237.162 – 10.78.237.163	10.78.237.163
83	10.78.237.164/31	10.78.237.164 – 10.78.237.165	10.78.237.165
84	10.78.237.166/31	10.78.237.166 – 10.78.237.167	10.78.237.167
85	10.78.237.168/31	10.78.237.168 – 10.78.237.169	10.78.237.169
86	10.78.237.170/31	10.78.237.170 – 10.78.237.171	10.78.237.171
87	10.78.237.172/31	10.78.237.172 – 10.78.237.173	10.78.237.173
88	10.78.237.174/31	10.78.237.174 – 10.78.237.175	10.78.237.175
89	10.78.237.176/31	10.78.237.176 – 10.78.237.177	10.78.237.177
90	10.78.237.178/31	10.78.237.178 – 10.78.237.179	10.78.237.179
91	10.78.237.180/31	10.78.237.180 – 10.78.237.181	10.78.237.181
92	10.78.237.182/31	10.78.237.182 – 10.78.237.183	10.78.237.183
93	10.78.237.184/31	10.78.237.184 – 10.78.237.185	10.78.237.185
94	10.78.237.186/31	10.78.237.186 – 10.78.237.187	10.78.237.187
95	10.78.237.188/31	10.78.237.188 – 10.78.237.189	10.78.237.189
96	10.78.237.190/31	10.78.237.190 – 10.78.237.191	10.78.237.191
97	10.78.237.192/31	10.78.237.192 – 10.78.237.193	10.78.237.193
98	10.78.237.194/31	10.78.237.194 – 10.78.237.195	10.78.237.195
99	10.78.237.196/31	10.78.237.196 – 10.78.237.197	10.78.237.197
100	10.78.237.198/31	10.78.237.198 – 10.78.237.199	10.78.237.199
101	10.78.237.200/31	10.78.237.200 – 10.78.237.201	10.78.237.201
102	10.78.237.202/31	10.78.237.202 – 10.78.237.203	10.78.237.203
103	10.78.237.204/31	10.78.237.204 – 10.78.237.205	10.78.237.205
104	10.78.237.206/31	10.78.237.206 – 10.78.237.207	10.78.237.207
105	10.78.237.208/31	10.78.237.208 – 10.78.237.209	10.78.237.209
106	10.78.237.210/31	10.78.237.210 – 10.78.237.211	10.78.237.211
107	10.78.237.212/31	10.78.237.212 – 10.78.237.213	10.78.237.213
108	10.78.237.214/31	10.78.237.214 – 10.78.237.215	10.78.237.215
109	10.78.237.216/31	10.78.237.216 – 10.78.237.217	10.78.237.217
110	10.78.237.218/31	10.78.237.218 – 10.78.237.219	10.78.237.219
111	10.78.237.220/31	10.78.237.220 – 10.78.237.221	10.78.237.221
112	10.78.237.222/31	10.78.237.222 – 10.78.237.223	10.78.237.223
113	10.78.237.224/31	10.78.237.224 – 10.78.237.225	10.78.237.225
114	10.78.237.226/31	10.78.237.226 – 10.78.237.227	10.78.237.227
115	10.78.237.228/31	10.78.237.228 – 10.78.237.229	10.78.237.229
116	10.78.237.230/31	10.78.237.230 – 10.78.237.231	10.78.237.231
117	10.78.237.232/31	10.78.237.232 – 10.78.237.233	10.78.237.233
118	10.78.237.234/31	10.78.237.234 – 10.78.237.235	10.78.237.235
119	10.78.237.236/31	10.78.237.236 – 10.78.237.237	10.78.237.237
120	10.78.237.238/31	10.78.237.238 – 10.78.237.239	10.78.237.239
121	10.78.237.240/31	10.78.237.240 – 10.78.237.241	10.78.237.241
122	10.78.237.242/31	10.78.237.242 – 10.78.237.243	10.78.237.243
123	10.78.237.244/31	10.78.237.244 – 10.78.237.245	10.78.237.245
124	10.78.237.246/31	10.78.237.246 – 10.78.237.247	10.78.237.247
125	10.78.237.248/31	10.78.237.248 – 10.78.237.249	10.78.237.249
126	10.78.237.250/31	10.78.237.250 – 10.78.237.251	10.78.237.251
127	10.78.237.252/31	10.78.237.252 – 10.78.237.253	10.78.237.253
128	10.78.237.254/31	10.78.237.254 – 10.78.237.255	10.78.237.255

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 →