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)10.78.207.0/24

network10.78.207.0/24

broadcast10.78.207.255

first host10.78.207.1

last host10.78.207.254

subnet mask255.255.255.0

wildcard0.0.0.255

addresses256

usable hosts254

classA

ipcalc 10.78.207.0/24

address00001010.01001110.11001111.00000000

subnet mask11111111.11111111.11111111.00000000

network00001010.01001110.11001111.00000000

broadcast00001010.01001110.11001111.11111111

green = network part, grey = host part

hex0x0a4ecf00

decimal172936960

reverse dns0.207.78.10.in-addr.arpa

ipv4-mapped::ffff:a4e:cf00

/24 split into /31 · 128 subnets

close ×

#	network	host range	broadcast
1	10.78.207.0/31	10.78.207.0 – 10.78.207.1	10.78.207.1
2	10.78.207.2/31	10.78.207.2 – 10.78.207.3	10.78.207.3
3	10.78.207.4/31	10.78.207.4 – 10.78.207.5	10.78.207.5
4	10.78.207.6/31	10.78.207.6 – 10.78.207.7	10.78.207.7
5	10.78.207.8/31	10.78.207.8 – 10.78.207.9	10.78.207.9
6	10.78.207.10/31	10.78.207.10 – 10.78.207.11	10.78.207.11
7	10.78.207.12/31	10.78.207.12 – 10.78.207.13	10.78.207.13
8	10.78.207.14/31	10.78.207.14 – 10.78.207.15	10.78.207.15
9	10.78.207.16/31	10.78.207.16 – 10.78.207.17	10.78.207.17
10	10.78.207.18/31	10.78.207.18 – 10.78.207.19	10.78.207.19
11	10.78.207.20/31	10.78.207.20 – 10.78.207.21	10.78.207.21
12	10.78.207.22/31	10.78.207.22 – 10.78.207.23	10.78.207.23
13	10.78.207.24/31	10.78.207.24 – 10.78.207.25	10.78.207.25
14	10.78.207.26/31	10.78.207.26 – 10.78.207.27	10.78.207.27
15	10.78.207.28/31	10.78.207.28 – 10.78.207.29	10.78.207.29
16	10.78.207.30/31	10.78.207.30 – 10.78.207.31	10.78.207.31
17	10.78.207.32/31	10.78.207.32 – 10.78.207.33	10.78.207.33
18	10.78.207.34/31	10.78.207.34 – 10.78.207.35	10.78.207.35
19	10.78.207.36/31	10.78.207.36 – 10.78.207.37	10.78.207.37
20	10.78.207.38/31	10.78.207.38 – 10.78.207.39	10.78.207.39
21	10.78.207.40/31	10.78.207.40 – 10.78.207.41	10.78.207.41
22	10.78.207.42/31	10.78.207.42 – 10.78.207.43	10.78.207.43
23	10.78.207.44/31	10.78.207.44 – 10.78.207.45	10.78.207.45
24	10.78.207.46/31	10.78.207.46 – 10.78.207.47	10.78.207.47
25	10.78.207.48/31	10.78.207.48 – 10.78.207.49	10.78.207.49
26	10.78.207.50/31	10.78.207.50 – 10.78.207.51	10.78.207.51
27	10.78.207.52/31	10.78.207.52 – 10.78.207.53	10.78.207.53
28	10.78.207.54/31	10.78.207.54 – 10.78.207.55	10.78.207.55
29	10.78.207.56/31	10.78.207.56 – 10.78.207.57	10.78.207.57
30	10.78.207.58/31	10.78.207.58 – 10.78.207.59	10.78.207.59
31	10.78.207.60/31	10.78.207.60 – 10.78.207.61	10.78.207.61
32	10.78.207.62/31	10.78.207.62 – 10.78.207.63	10.78.207.63
33	10.78.207.64/31	10.78.207.64 – 10.78.207.65	10.78.207.65
34	10.78.207.66/31	10.78.207.66 – 10.78.207.67	10.78.207.67
35	10.78.207.68/31	10.78.207.68 – 10.78.207.69	10.78.207.69
36	10.78.207.70/31	10.78.207.70 – 10.78.207.71	10.78.207.71
37	10.78.207.72/31	10.78.207.72 – 10.78.207.73	10.78.207.73
38	10.78.207.74/31	10.78.207.74 – 10.78.207.75	10.78.207.75
39	10.78.207.76/31	10.78.207.76 – 10.78.207.77	10.78.207.77
40	10.78.207.78/31	10.78.207.78 – 10.78.207.79	10.78.207.79
41	10.78.207.80/31	10.78.207.80 – 10.78.207.81	10.78.207.81
42	10.78.207.82/31	10.78.207.82 – 10.78.207.83	10.78.207.83
43	10.78.207.84/31	10.78.207.84 – 10.78.207.85	10.78.207.85
44	10.78.207.86/31	10.78.207.86 – 10.78.207.87	10.78.207.87
45	10.78.207.88/31	10.78.207.88 – 10.78.207.89	10.78.207.89
46	10.78.207.90/31	10.78.207.90 – 10.78.207.91	10.78.207.91
47	10.78.207.92/31	10.78.207.92 – 10.78.207.93	10.78.207.93
48	10.78.207.94/31	10.78.207.94 – 10.78.207.95	10.78.207.95
49	10.78.207.96/31	10.78.207.96 – 10.78.207.97	10.78.207.97
50	10.78.207.98/31	10.78.207.98 – 10.78.207.99	10.78.207.99
51	10.78.207.100/31	10.78.207.100 – 10.78.207.101	10.78.207.101
52	10.78.207.102/31	10.78.207.102 – 10.78.207.103	10.78.207.103
53	10.78.207.104/31	10.78.207.104 – 10.78.207.105	10.78.207.105
54	10.78.207.106/31	10.78.207.106 – 10.78.207.107	10.78.207.107
55	10.78.207.108/31	10.78.207.108 – 10.78.207.109	10.78.207.109
56	10.78.207.110/31	10.78.207.110 – 10.78.207.111	10.78.207.111
57	10.78.207.112/31	10.78.207.112 – 10.78.207.113	10.78.207.113
58	10.78.207.114/31	10.78.207.114 – 10.78.207.115	10.78.207.115
59	10.78.207.116/31	10.78.207.116 – 10.78.207.117	10.78.207.117
60	10.78.207.118/31	10.78.207.118 – 10.78.207.119	10.78.207.119
61	10.78.207.120/31	10.78.207.120 – 10.78.207.121	10.78.207.121
62	10.78.207.122/31	10.78.207.122 – 10.78.207.123	10.78.207.123
63	10.78.207.124/31	10.78.207.124 – 10.78.207.125	10.78.207.125
64	10.78.207.126/31	10.78.207.126 – 10.78.207.127	10.78.207.127
65	10.78.207.128/31	10.78.207.128 – 10.78.207.129	10.78.207.129
66	10.78.207.130/31	10.78.207.130 – 10.78.207.131	10.78.207.131
67	10.78.207.132/31	10.78.207.132 – 10.78.207.133	10.78.207.133
68	10.78.207.134/31	10.78.207.134 – 10.78.207.135	10.78.207.135
69	10.78.207.136/31	10.78.207.136 – 10.78.207.137	10.78.207.137
70	10.78.207.138/31	10.78.207.138 – 10.78.207.139	10.78.207.139
71	10.78.207.140/31	10.78.207.140 – 10.78.207.141	10.78.207.141
72	10.78.207.142/31	10.78.207.142 – 10.78.207.143	10.78.207.143
73	10.78.207.144/31	10.78.207.144 – 10.78.207.145	10.78.207.145
74	10.78.207.146/31	10.78.207.146 – 10.78.207.147	10.78.207.147
75	10.78.207.148/31	10.78.207.148 – 10.78.207.149	10.78.207.149
76	10.78.207.150/31	10.78.207.150 – 10.78.207.151	10.78.207.151
77	10.78.207.152/31	10.78.207.152 – 10.78.207.153	10.78.207.153
78	10.78.207.154/31	10.78.207.154 – 10.78.207.155	10.78.207.155
79	10.78.207.156/31	10.78.207.156 – 10.78.207.157	10.78.207.157
80	10.78.207.158/31	10.78.207.158 – 10.78.207.159	10.78.207.159
81	10.78.207.160/31	10.78.207.160 – 10.78.207.161	10.78.207.161
82	10.78.207.162/31	10.78.207.162 – 10.78.207.163	10.78.207.163
83	10.78.207.164/31	10.78.207.164 – 10.78.207.165	10.78.207.165
84	10.78.207.166/31	10.78.207.166 – 10.78.207.167	10.78.207.167
85	10.78.207.168/31	10.78.207.168 – 10.78.207.169	10.78.207.169
86	10.78.207.170/31	10.78.207.170 – 10.78.207.171	10.78.207.171
87	10.78.207.172/31	10.78.207.172 – 10.78.207.173	10.78.207.173
88	10.78.207.174/31	10.78.207.174 – 10.78.207.175	10.78.207.175
89	10.78.207.176/31	10.78.207.176 – 10.78.207.177	10.78.207.177
90	10.78.207.178/31	10.78.207.178 – 10.78.207.179	10.78.207.179
91	10.78.207.180/31	10.78.207.180 – 10.78.207.181	10.78.207.181
92	10.78.207.182/31	10.78.207.182 – 10.78.207.183	10.78.207.183
93	10.78.207.184/31	10.78.207.184 – 10.78.207.185	10.78.207.185
94	10.78.207.186/31	10.78.207.186 – 10.78.207.187	10.78.207.187
95	10.78.207.188/31	10.78.207.188 – 10.78.207.189	10.78.207.189
96	10.78.207.190/31	10.78.207.190 – 10.78.207.191	10.78.207.191
97	10.78.207.192/31	10.78.207.192 – 10.78.207.193	10.78.207.193
98	10.78.207.194/31	10.78.207.194 – 10.78.207.195	10.78.207.195
99	10.78.207.196/31	10.78.207.196 – 10.78.207.197	10.78.207.197
100	10.78.207.198/31	10.78.207.198 – 10.78.207.199	10.78.207.199
101	10.78.207.200/31	10.78.207.200 – 10.78.207.201	10.78.207.201
102	10.78.207.202/31	10.78.207.202 – 10.78.207.203	10.78.207.203
103	10.78.207.204/31	10.78.207.204 – 10.78.207.205	10.78.207.205
104	10.78.207.206/31	10.78.207.206 – 10.78.207.207	10.78.207.207
105	10.78.207.208/31	10.78.207.208 – 10.78.207.209	10.78.207.209
106	10.78.207.210/31	10.78.207.210 – 10.78.207.211	10.78.207.211
107	10.78.207.212/31	10.78.207.212 – 10.78.207.213	10.78.207.213
108	10.78.207.214/31	10.78.207.214 – 10.78.207.215	10.78.207.215
109	10.78.207.216/31	10.78.207.216 – 10.78.207.217	10.78.207.217
110	10.78.207.218/31	10.78.207.218 – 10.78.207.219	10.78.207.219
111	10.78.207.220/31	10.78.207.220 – 10.78.207.221	10.78.207.221
112	10.78.207.222/31	10.78.207.222 – 10.78.207.223	10.78.207.223
113	10.78.207.224/31	10.78.207.224 – 10.78.207.225	10.78.207.225
114	10.78.207.226/31	10.78.207.226 – 10.78.207.227	10.78.207.227
115	10.78.207.228/31	10.78.207.228 – 10.78.207.229	10.78.207.229
116	10.78.207.230/31	10.78.207.230 – 10.78.207.231	10.78.207.231
117	10.78.207.232/31	10.78.207.232 – 10.78.207.233	10.78.207.233
118	10.78.207.234/31	10.78.207.234 – 10.78.207.235	10.78.207.235
119	10.78.207.236/31	10.78.207.236 – 10.78.207.237	10.78.207.237
120	10.78.207.238/31	10.78.207.238 – 10.78.207.239	10.78.207.239
121	10.78.207.240/31	10.78.207.240 – 10.78.207.241	10.78.207.241
122	10.78.207.242/31	10.78.207.242 – 10.78.207.243	10.78.207.243
123	10.78.207.244/31	10.78.207.244 – 10.78.207.245	10.78.207.245
124	10.78.207.246/31	10.78.207.246 – 10.78.207.247	10.78.207.247
125	10.78.207.248/31	10.78.207.248 – 10.78.207.249	10.78.207.249
126	10.78.207.250/31	10.78.207.250 – 10.78.207.251	10.78.207.251
127	10.78.207.252/31	10.78.207.252 – 10.78.207.253	10.78.207.253
128	10.78.207.254/31	10.78.207.254 – 10.78.207.255	10.78.207.255

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 →