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)10.78.192.0/24

network10.78.192.0/24

broadcast10.78.192.255

first host10.78.192.1

last host10.78.192.254

subnet mask255.255.255.0

wildcard0.0.0.255

addresses256

usable hosts254

classA

ipcalc 10.78.192.0/24

address00001010.01001110.11000000.00000000

subnet mask11111111.11111111.11111111.00000000

network00001010.01001110.11000000.00000000

broadcast00001010.01001110.11000000.11111111

green = network part, grey = host part

hex0x0a4ec000

decimal172933120

reverse dns0.192.78.10.in-addr.arpa

ipv4-mapped::ffff:a4e:c000

/24 split into /31 · 128 subnets

close ×

#	network	host range	broadcast
1	10.78.192.0/31	10.78.192.0 – 10.78.192.1	10.78.192.1
2	10.78.192.2/31	10.78.192.2 – 10.78.192.3	10.78.192.3
3	10.78.192.4/31	10.78.192.4 – 10.78.192.5	10.78.192.5
4	10.78.192.6/31	10.78.192.6 – 10.78.192.7	10.78.192.7
5	10.78.192.8/31	10.78.192.8 – 10.78.192.9	10.78.192.9
6	10.78.192.10/31	10.78.192.10 – 10.78.192.11	10.78.192.11
7	10.78.192.12/31	10.78.192.12 – 10.78.192.13	10.78.192.13
8	10.78.192.14/31	10.78.192.14 – 10.78.192.15	10.78.192.15
9	10.78.192.16/31	10.78.192.16 – 10.78.192.17	10.78.192.17
10	10.78.192.18/31	10.78.192.18 – 10.78.192.19	10.78.192.19
11	10.78.192.20/31	10.78.192.20 – 10.78.192.21	10.78.192.21
12	10.78.192.22/31	10.78.192.22 – 10.78.192.23	10.78.192.23
13	10.78.192.24/31	10.78.192.24 – 10.78.192.25	10.78.192.25
14	10.78.192.26/31	10.78.192.26 – 10.78.192.27	10.78.192.27
15	10.78.192.28/31	10.78.192.28 – 10.78.192.29	10.78.192.29
16	10.78.192.30/31	10.78.192.30 – 10.78.192.31	10.78.192.31
17	10.78.192.32/31	10.78.192.32 – 10.78.192.33	10.78.192.33
18	10.78.192.34/31	10.78.192.34 – 10.78.192.35	10.78.192.35
19	10.78.192.36/31	10.78.192.36 – 10.78.192.37	10.78.192.37
20	10.78.192.38/31	10.78.192.38 – 10.78.192.39	10.78.192.39
21	10.78.192.40/31	10.78.192.40 – 10.78.192.41	10.78.192.41
22	10.78.192.42/31	10.78.192.42 – 10.78.192.43	10.78.192.43
23	10.78.192.44/31	10.78.192.44 – 10.78.192.45	10.78.192.45
24	10.78.192.46/31	10.78.192.46 – 10.78.192.47	10.78.192.47
25	10.78.192.48/31	10.78.192.48 – 10.78.192.49	10.78.192.49
26	10.78.192.50/31	10.78.192.50 – 10.78.192.51	10.78.192.51
27	10.78.192.52/31	10.78.192.52 – 10.78.192.53	10.78.192.53
28	10.78.192.54/31	10.78.192.54 – 10.78.192.55	10.78.192.55
29	10.78.192.56/31	10.78.192.56 – 10.78.192.57	10.78.192.57
30	10.78.192.58/31	10.78.192.58 – 10.78.192.59	10.78.192.59
31	10.78.192.60/31	10.78.192.60 – 10.78.192.61	10.78.192.61
32	10.78.192.62/31	10.78.192.62 – 10.78.192.63	10.78.192.63
33	10.78.192.64/31	10.78.192.64 – 10.78.192.65	10.78.192.65
34	10.78.192.66/31	10.78.192.66 – 10.78.192.67	10.78.192.67
35	10.78.192.68/31	10.78.192.68 – 10.78.192.69	10.78.192.69
36	10.78.192.70/31	10.78.192.70 – 10.78.192.71	10.78.192.71
37	10.78.192.72/31	10.78.192.72 – 10.78.192.73	10.78.192.73
38	10.78.192.74/31	10.78.192.74 – 10.78.192.75	10.78.192.75
39	10.78.192.76/31	10.78.192.76 – 10.78.192.77	10.78.192.77
40	10.78.192.78/31	10.78.192.78 – 10.78.192.79	10.78.192.79
41	10.78.192.80/31	10.78.192.80 – 10.78.192.81	10.78.192.81
42	10.78.192.82/31	10.78.192.82 – 10.78.192.83	10.78.192.83
43	10.78.192.84/31	10.78.192.84 – 10.78.192.85	10.78.192.85
44	10.78.192.86/31	10.78.192.86 – 10.78.192.87	10.78.192.87
45	10.78.192.88/31	10.78.192.88 – 10.78.192.89	10.78.192.89
46	10.78.192.90/31	10.78.192.90 – 10.78.192.91	10.78.192.91
47	10.78.192.92/31	10.78.192.92 – 10.78.192.93	10.78.192.93
48	10.78.192.94/31	10.78.192.94 – 10.78.192.95	10.78.192.95
49	10.78.192.96/31	10.78.192.96 – 10.78.192.97	10.78.192.97
50	10.78.192.98/31	10.78.192.98 – 10.78.192.99	10.78.192.99
51	10.78.192.100/31	10.78.192.100 – 10.78.192.101	10.78.192.101
52	10.78.192.102/31	10.78.192.102 – 10.78.192.103	10.78.192.103
53	10.78.192.104/31	10.78.192.104 – 10.78.192.105	10.78.192.105
54	10.78.192.106/31	10.78.192.106 – 10.78.192.107	10.78.192.107
55	10.78.192.108/31	10.78.192.108 – 10.78.192.109	10.78.192.109
56	10.78.192.110/31	10.78.192.110 – 10.78.192.111	10.78.192.111
57	10.78.192.112/31	10.78.192.112 – 10.78.192.113	10.78.192.113
58	10.78.192.114/31	10.78.192.114 – 10.78.192.115	10.78.192.115
59	10.78.192.116/31	10.78.192.116 – 10.78.192.117	10.78.192.117
60	10.78.192.118/31	10.78.192.118 – 10.78.192.119	10.78.192.119
61	10.78.192.120/31	10.78.192.120 – 10.78.192.121	10.78.192.121
62	10.78.192.122/31	10.78.192.122 – 10.78.192.123	10.78.192.123
63	10.78.192.124/31	10.78.192.124 – 10.78.192.125	10.78.192.125
64	10.78.192.126/31	10.78.192.126 – 10.78.192.127	10.78.192.127
65	10.78.192.128/31	10.78.192.128 – 10.78.192.129	10.78.192.129
66	10.78.192.130/31	10.78.192.130 – 10.78.192.131	10.78.192.131
67	10.78.192.132/31	10.78.192.132 – 10.78.192.133	10.78.192.133
68	10.78.192.134/31	10.78.192.134 – 10.78.192.135	10.78.192.135
69	10.78.192.136/31	10.78.192.136 – 10.78.192.137	10.78.192.137
70	10.78.192.138/31	10.78.192.138 – 10.78.192.139	10.78.192.139
71	10.78.192.140/31	10.78.192.140 – 10.78.192.141	10.78.192.141
72	10.78.192.142/31	10.78.192.142 – 10.78.192.143	10.78.192.143
73	10.78.192.144/31	10.78.192.144 – 10.78.192.145	10.78.192.145
74	10.78.192.146/31	10.78.192.146 – 10.78.192.147	10.78.192.147
75	10.78.192.148/31	10.78.192.148 – 10.78.192.149	10.78.192.149
76	10.78.192.150/31	10.78.192.150 – 10.78.192.151	10.78.192.151
77	10.78.192.152/31	10.78.192.152 – 10.78.192.153	10.78.192.153
78	10.78.192.154/31	10.78.192.154 – 10.78.192.155	10.78.192.155
79	10.78.192.156/31	10.78.192.156 – 10.78.192.157	10.78.192.157
80	10.78.192.158/31	10.78.192.158 – 10.78.192.159	10.78.192.159
81	10.78.192.160/31	10.78.192.160 – 10.78.192.161	10.78.192.161
82	10.78.192.162/31	10.78.192.162 – 10.78.192.163	10.78.192.163
83	10.78.192.164/31	10.78.192.164 – 10.78.192.165	10.78.192.165
84	10.78.192.166/31	10.78.192.166 – 10.78.192.167	10.78.192.167
85	10.78.192.168/31	10.78.192.168 – 10.78.192.169	10.78.192.169
86	10.78.192.170/31	10.78.192.170 – 10.78.192.171	10.78.192.171
87	10.78.192.172/31	10.78.192.172 – 10.78.192.173	10.78.192.173
88	10.78.192.174/31	10.78.192.174 – 10.78.192.175	10.78.192.175
89	10.78.192.176/31	10.78.192.176 – 10.78.192.177	10.78.192.177
90	10.78.192.178/31	10.78.192.178 – 10.78.192.179	10.78.192.179
91	10.78.192.180/31	10.78.192.180 – 10.78.192.181	10.78.192.181
92	10.78.192.182/31	10.78.192.182 – 10.78.192.183	10.78.192.183
93	10.78.192.184/31	10.78.192.184 – 10.78.192.185	10.78.192.185
94	10.78.192.186/31	10.78.192.186 – 10.78.192.187	10.78.192.187
95	10.78.192.188/31	10.78.192.188 – 10.78.192.189	10.78.192.189
96	10.78.192.190/31	10.78.192.190 – 10.78.192.191	10.78.192.191
97	10.78.192.192/31	10.78.192.192 – 10.78.192.193	10.78.192.193
98	10.78.192.194/31	10.78.192.194 – 10.78.192.195	10.78.192.195
99	10.78.192.196/31	10.78.192.196 – 10.78.192.197	10.78.192.197
100	10.78.192.198/31	10.78.192.198 – 10.78.192.199	10.78.192.199
101	10.78.192.200/31	10.78.192.200 – 10.78.192.201	10.78.192.201
102	10.78.192.202/31	10.78.192.202 – 10.78.192.203	10.78.192.203
103	10.78.192.204/31	10.78.192.204 – 10.78.192.205	10.78.192.205
104	10.78.192.206/31	10.78.192.206 – 10.78.192.207	10.78.192.207
105	10.78.192.208/31	10.78.192.208 – 10.78.192.209	10.78.192.209
106	10.78.192.210/31	10.78.192.210 – 10.78.192.211	10.78.192.211
107	10.78.192.212/31	10.78.192.212 – 10.78.192.213	10.78.192.213
108	10.78.192.214/31	10.78.192.214 – 10.78.192.215	10.78.192.215
109	10.78.192.216/31	10.78.192.216 – 10.78.192.217	10.78.192.217
110	10.78.192.218/31	10.78.192.218 – 10.78.192.219	10.78.192.219
111	10.78.192.220/31	10.78.192.220 – 10.78.192.221	10.78.192.221
112	10.78.192.222/31	10.78.192.222 – 10.78.192.223	10.78.192.223
113	10.78.192.224/31	10.78.192.224 – 10.78.192.225	10.78.192.225
114	10.78.192.226/31	10.78.192.226 – 10.78.192.227	10.78.192.227
115	10.78.192.228/31	10.78.192.228 – 10.78.192.229	10.78.192.229
116	10.78.192.230/31	10.78.192.230 – 10.78.192.231	10.78.192.231
117	10.78.192.232/31	10.78.192.232 – 10.78.192.233	10.78.192.233
118	10.78.192.234/31	10.78.192.234 – 10.78.192.235	10.78.192.235
119	10.78.192.236/31	10.78.192.236 – 10.78.192.237	10.78.192.237
120	10.78.192.238/31	10.78.192.238 – 10.78.192.239	10.78.192.239
121	10.78.192.240/31	10.78.192.240 – 10.78.192.241	10.78.192.241
122	10.78.192.242/31	10.78.192.242 – 10.78.192.243	10.78.192.243
123	10.78.192.244/31	10.78.192.244 – 10.78.192.245	10.78.192.245
124	10.78.192.246/31	10.78.192.246 – 10.78.192.247	10.78.192.247
125	10.78.192.248/31	10.78.192.248 – 10.78.192.249	10.78.192.249
126	10.78.192.250/31	10.78.192.250 – 10.78.192.251	10.78.192.251
127	10.78.192.252/31	10.78.192.252 – 10.78.192.253	10.78.192.253
128	10.78.192.254/31	10.78.192.254 – 10.78.192.255	10.78.192.255

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 →