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)10.78.187.0/24

network10.78.187.0/24

broadcast10.78.187.255

first host10.78.187.1

last host10.78.187.254

subnet mask255.255.255.0

wildcard0.0.0.255

addresses256

usable hosts254

classA

ipcalc 10.78.187.0/24

address00001010.01001110.10111011.00000000

subnet mask11111111.11111111.11111111.00000000

network00001010.01001110.10111011.00000000

broadcast00001010.01001110.10111011.11111111

green = network part, grey = host part

hex0x0a4ebb00

decimal172931840

reverse dns0.187.78.10.in-addr.arpa

ipv4-mapped::ffff:a4e:bb00

/24 split into /31 · 128 subnets

close ×

#	network	host range	broadcast
1	10.78.187.0/31	10.78.187.0 – 10.78.187.1	10.78.187.1
2	10.78.187.2/31	10.78.187.2 – 10.78.187.3	10.78.187.3
3	10.78.187.4/31	10.78.187.4 – 10.78.187.5	10.78.187.5
4	10.78.187.6/31	10.78.187.6 – 10.78.187.7	10.78.187.7
5	10.78.187.8/31	10.78.187.8 – 10.78.187.9	10.78.187.9
6	10.78.187.10/31	10.78.187.10 – 10.78.187.11	10.78.187.11
7	10.78.187.12/31	10.78.187.12 – 10.78.187.13	10.78.187.13
8	10.78.187.14/31	10.78.187.14 – 10.78.187.15	10.78.187.15
9	10.78.187.16/31	10.78.187.16 – 10.78.187.17	10.78.187.17
10	10.78.187.18/31	10.78.187.18 – 10.78.187.19	10.78.187.19
11	10.78.187.20/31	10.78.187.20 – 10.78.187.21	10.78.187.21
12	10.78.187.22/31	10.78.187.22 – 10.78.187.23	10.78.187.23
13	10.78.187.24/31	10.78.187.24 – 10.78.187.25	10.78.187.25
14	10.78.187.26/31	10.78.187.26 – 10.78.187.27	10.78.187.27
15	10.78.187.28/31	10.78.187.28 – 10.78.187.29	10.78.187.29
16	10.78.187.30/31	10.78.187.30 – 10.78.187.31	10.78.187.31
17	10.78.187.32/31	10.78.187.32 – 10.78.187.33	10.78.187.33
18	10.78.187.34/31	10.78.187.34 – 10.78.187.35	10.78.187.35
19	10.78.187.36/31	10.78.187.36 – 10.78.187.37	10.78.187.37
20	10.78.187.38/31	10.78.187.38 – 10.78.187.39	10.78.187.39
21	10.78.187.40/31	10.78.187.40 – 10.78.187.41	10.78.187.41
22	10.78.187.42/31	10.78.187.42 – 10.78.187.43	10.78.187.43
23	10.78.187.44/31	10.78.187.44 – 10.78.187.45	10.78.187.45
24	10.78.187.46/31	10.78.187.46 – 10.78.187.47	10.78.187.47
25	10.78.187.48/31	10.78.187.48 – 10.78.187.49	10.78.187.49
26	10.78.187.50/31	10.78.187.50 – 10.78.187.51	10.78.187.51
27	10.78.187.52/31	10.78.187.52 – 10.78.187.53	10.78.187.53
28	10.78.187.54/31	10.78.187.54 – 10.78.187.55	10.78.187.55
29	10.78.187.56/31	10.78.187.56 – 10.78.187.57	10.78.187.57
30	10.78.187.58/31	10.78.187.58 – 10.78.187.59	10.78.187.59
31	10.78.187.60/31	10.78.187.60 – 10.78.187.61	10.78.187.61
32	10.78.187.62/31	10.78.187.62 – 10.78.187.63	10.78.187.63
33	10.78.187.64/31	10.78.187.64 – 10.78.187.65	10.78.187.65
34	10.78.187.66/31	10.78.187.66 – 10.78.187.67	10.78.187.67
35	10.78.187.68/31	10.78.187.68 – 10.78.187.69	10.78.187.69
36	10.78.187.70/31	10.78.187.70 – 10.78.187.71	10.78.187.71
37	10.78.187.72/31	10.78.187.72 – 10.78.187.73	10.78.187.73
38	10.78.187.74/31	10.78.187.74 – 10.78.187.75	10.78.187.75
39	10.78.187.76/31	10.78.187.76 – 10.78.187.77	10.78.187.77
40	10.78.187.78/31	10.78.187.78 – 10.78.187.79	10.78.187.79
41	10.78.187.80/31	10.78.187.80 – 10.78.187.81	10.78.187.81
42	10.78.187.82/31	10.78.187.82 – 10.78.187.83	10.78.187.83
43	10.78.187.84/31	10.78.187.84 – 10.78.187.85	10.78.187.85
44	10.78.187.86/31	10.78.187.86 – 10.78.187.87	10.78.187.87
45	10.78.187.88/31	10.78.187.88 – 10.78.187.89	10.78.187.89
46	10.78.187.90/31	10.78.187.90 – 10.78.187.91	10.78.187.91
47	10.78.187.92/31	10.78.187.92 – 10.78.187.93	10.78.187.93
48	10.78.187.94/31	10.78.187.94 – 10.78.187.95	10.78.187.95
49	10.78.187.96/31	10.78.187.96 – 10.78.187.97	10.78.187.97
50	10.78.187.98/31	10.78.187.98 – 10.78.187.99	10.78.187.99
51	10.78.187.100/31	10.78.187.100 – 10.78.187.101	10.78.187.101
52	10.78.187.102/31	10.78.187.102 – 10.78.187.103	10.78.187.103
53	10.78.187.104/31	10.78.187.104 – 10.78.187.105	10.78.187.105
54	10.78.187.106/31	10.78.187.106 – 10.78.187.107	10.78.187.107
55	10.78.187.108/31	10.78.187.108 – 10.78.187.109	10.78.187.109
56	10.78.187.110/31	10.78.187.110 – 10.78.187.111	10.78.187.111
57	10.78.187.112/31	10.78.187.112 – 10.78.187.113	10.78.187.113
58	10.78.187.114/31	10.78.187.114 – 10.78.187.115	10.78.187.115
59	10.78.187.116/31	10.78.187.116 – 10.78.187.117	10.78.187.117
60	10.78.187.118/31	10.78.187.118 – 10.78.187.119	10.78.187.119
61	10.78.187.120/31	10.78.187.120 – 10.78.187.121	10.78.187.121
62	10.78.187.122/31	10.78.187.122 – 10.78.187.123	10.78.187.123
63	10.78.187.124/31	10.78.187.124 – 10.78.187.125	10.78.187.125
64	10.78.187.126/31	10.78.187.126 – 10.78.187.127	10.78.187.127
65	10.78.187.128/31	10.78.187.128 – 10.78.187.129	10.78.187.129
66	10.78.187.130/31	10.78.187.130 – 10.78.187.131	10.78.187.131
67	10.78.187.132/31	10.78.187.132 – 10.78.187.133	10.78.187.133
68	10.78.187.134/31	10.78.187.134 – 10.78.187.135	10.78.187.135
69	10.78.187.136/31	10.78.187.136 – 10.78.187.137	10.78.187.137
70	10.78.187.138/31	10.78.187.138 – 10.78.187.139	10.78.187.139
71	10.78.187.140/31	10.78.187.140 – 10.78.187.141	10.78.187.141
72	10.78.187.142/31	10.78.187.142 – 10.78.187.143	10.78.187.143
73	10.78.187.144/31	10.78.187.144 – 10.78.187.145	10.78.187.145
74	10.78.187.146/31	10.78.187.146 – 10.78.187.147	10.78.187.147
75	10.78.187.148/31	10.78.187.148 – 10.78.187.149	10.78.187.149
76	10.78.187.150/31	10.78.187.150 – 10.78.187.151	10.78.187.151
77	10.78.187.152/31	10.78.187.152 – 10.78.187.153	10.78.187.153
78	10.78.187.154/31	10.78.187.154 – 10.78.187.155	10.78.187.155
79	10.78.187.156/31	10.78.187.156 – 10.78.187.157	10.78.187.157
80	10.78.187.158/31	10.78.187.158 – 10.78.187.159	10.78.187.159
81	10.78.187.160/31	10.78.187.160 – 10.78.187.161	10.78.187.161
82	10.78.187.162/31	10.78.187.162 – 10.78.187.163	10.78.187.163
83	10.78.187.164/31	10.78.187.164 – 10.78.187.165	10.78.187.165
84	10.78.187.166/31	10.78.187.166 – 10.78.187.167	10.78.187.167
85	10.78.187.168/31	10.78.187.168 – 10.78.187.169	10.78.187.169
86	10.78.187.170/31	10.78.187.170 – 10.78.187.171	10.78.187.171
87	10.78.187.172/31	10.78.187.172 – 10.78.187.173	10.78.187.173
88	10.78.187.174/31	10.78.187.174 – 10.78.187.175	10.78.187.175
89	10.78.187.176/31	10.78.187.176 – 10.78.187.177	10.78.187.177
90	10.78.187.178/31	10.78.187.178 – 10.78.187.179	10.78.187.179
91	10.78.187.180/31	10.78.187.180 – 10.78.187.181	10.78.187.181
92	10.78.187.182/31	10.78.187.182 – 10.78.187.183	10.78.187.183
93	10.78.187.184/31	10.78.187.184 – 10.78.187.185	10.78.187.185
94	10.78.187.186/31	10.78.187.186 – 10.78.187.187	10.78.187.187
95	10.78.187.188/31	10.78.187.188 – 10.78.187.189	10.78.187.189
96	10.78.187.190/31	10.78.187.190 – 10.78.187.191	10.78.187.191
97	10.78.187.192/31	10.78.187.192 – 10.78.187.193	10.78.187.193
98	10.78.187.194/31	10.78.187.194 – 10.78.187.195	10.78.187.195
99	10.78.187.196/31	10.78.187.196 – 10.78.187.197	10.78.187.197
100	10.78.187.198/31	10.78.187.198 – 10.78.187.199	10.78.187.199
101	10.78.187.200/31	10.78.187.200 – 10.78.187.201	10.78.187.201
102	10.78.187.202/31	10.78.187.202 – 10.78.187.203	10.78.187.203
103	10.78.187.204/31	10.78.187.204 – 10.78.187.205	10.78.187.205
104	10.78.187.206/31	10.78.187.206 – 10.78.187.207	10.78.187.207
105	10.78.187.208/31	10.78.187.208 – 10.78.187.209	10.78.187.209
106	10.78.187.210/31	10.78.187.210 – 10.78.187.211	10.78.187.211
107	10.78.187.212/31	10.78.187.212 – 10.78.187.213	10.78.187.213
108	10.78.187.214/31	10.78.187.214 – 10.78.187.215	10.78.187.215
109	10.78.187.216/31	10.78.187.216 – 10.78.187.217	10.78.187.217
110	10.78.187.218/31	10.78.187.218 – 10.78.187.219	10.78.187.219
111	10.78.187.220/31	10.78.187.220 – 10.78.187.221	10.78.187.221
112	10.78.187.222/31	10.78.187.222 – 10.78.187.223	10.78.187.223
113	10.78.187.224/31	10.78.187.224 – 10.78.187.225	10.78.187.225
114	10.78.187.226/31	10.78.187.226 – 10.78.187.227	10.78.187.227
115	10.78.187.228/31	10.78.187.228 – 10.78.187.229	10.78.187.229
116	10.78.187.230/31	10.78.187.230 – 10.78.187.231	10.78.187.231
117	10.78.187.232/31	10.78.187.232 – 10.78.187.233	10.78.187.233
118	10.78.187.234/31	10.78.187.234 – 10.78.187.235	10.78.187.235
119	10.78.187.236/31	10.78.187.236 – 10.78.187.237	10.78.187.237
120	10.78.187.238/31	10.78.187.238 – 10.78.187.239	10.78.187.239
121	10.78.187.240/31	10.78.187.240 – 10.78.187.241	10.78.187.241
122	10.78.187.242/31	10.78.187.242 – 10.78.187.243	10.78.187.243
123	10.78.187.244/31	10.78.187.244 – 10.78.187.245	10.78.187.245
124	10.78.187.246/31	10.78.187.246 – 10.78.187.247	10.78.187.247
125	10.78.187.248/31	10.78.187.248 – 10.78.187.249	10.78.187.249
126	10.78.187.250/31	10.78.187.250 – 10.78.187.251	10.78.187.251
127	10.78.187.252/31	10.78.187.252 – 10.78.187.253	10.78.187.253
128	10.78.187.254/31	10.78.187.254 – 10.78.187.255	10.78.187.255

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 →