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)10.115.78.0/24

network10.115.78.0/24

broadcast10.115.78.255

first host10.115.78.1

last host10.115.78.254

subnet mask255.255.255.0

wildcard0.0.0.255

addresses256

usable hosts254

classA

ipcalc 10.115.78.0/24

address00001010.01110011.01001110.00000000

subnet mask11111111.11111111.11111111.00000000

network00001010.01110011.01001110.00000000

broadcast00001010.01110011.01001110.11111111

green = network part, grey = host part

hex0x0a734e00

decimal175328768

reverse dns0.78.115.10.in-addr.arpa

ipv4-mapped::ffff:a73:4e00

/24 split into /31 · 128 subnets

close ×

#	network	host range	broadcast
1	10.115.78.0/31	10.115.78.0 – 10.115.78.1	10.115.78.1
2	10.115.78.2/31	10.115.78.2 – 10.115.78.3	10.115.78.3
3	10.115.78.4/31	10.115.78.4 – 10.115.78.5	10.115.78.5
4	10.115.78.6/31	10.115.78.6 – 10.115.78.7	10.115.78.7
5	10.115.78.8/31	10.115.78.8 – 10.115.78.9	10.115.78.9
6	10.115.78.10/31	10.115.78.10 – 10.115.78.11	10.115.78.11
7	10.115.78.12/31	10.115.78.12 – 10.115.78.13	10.115.78.13
8	10.115.78.14/31	10.115.78.14 – 10.115.78.15	10.115.78.15
9	10.115.78.16/31	10.115.78.16 – 10.115.78.17	10.115.78.17
10	10.115.78.18/31	10.115.78.18 – 10.115.78.19	10.115.78.19
11	10.115.78.20/31	10.115.78.20 – 10.115.78.21	10.115.78.21
12	10.115.78.22/31	10.115.78.22 – 10.115.78.23	10.115.78.23
13	10.115.78.24/31	10.115.78.24 – 10.115.78.25	10.115.78.25
14	10.115.78.26/31	10.115.78.26 – 10.115.78.27	10.115.78.27
15	10.115.78.28/31	10.115.78.28 – 10.115.78.29	10.115.78.29
16	10.115.78.30/31	10.115.78.30 – 10.115.78.31	10.115.78.31
17	10.115.78.32/31	10.115.78.32 – 10.115.78.33	10.115.78.33
18	10.115.78.34/31	10.115.78.34 – 10.115.78.35	10.115.78.35
19	10.115.78.36/31	10.115.78.36 – 10.115.78.37	10.115.78.37
20	10.115.78.38/31	10.115.78.38 – 10.115.78.39	10.115.78.39
21	10.115.78.40/31	10.115.78.40 – 10.115.78.41	10.115.78.41
22	10.115.78.42/31	10.115.78.42 – 10.115.78.43	10.115.78.43
23	10.115.78.44/31	10.115.78.44 – 10.115.78.45	10.115.78.45
24	10.115.78.46/31	10.115.78.46 – 10.115.78.47	10.115.78.47
25	10.115.78.48/31	10.115.78.48 – 10.115.78.49	10.115.78.49
26	10.115.78.50/31	10.115.78.50 – 10.115.78.51	10.115.78.51
27	10.115.78.52/31	10.115.78.52 – 10.115.78.53	10.115.78.53
28	10.115.78.54/31	10.115.78.54 – 10.115.78.55	10.115.78.55
29	10.115.78.56/31	10.115.78.56 – 10.115.78.57	10.115.78.57
30	10.115.78.58/31	10.115.78.58 – 10.115.78.59	10.115.78.59
31	10.115.78.60/31	10.115.78.60 – 10.115.78.61	10.115.78.61
32	10.115.78.62/31	10.115.78.62 – 10.115.78.63	10.115.78.63
33	10.115.78.64/31	10.115.78.64 – 10.115.78.65	10.115.78.65
34	10.115.78.66/31	10.115.78.66 – 10.115.78.67	10.115.78.67
35	10.115.78.68/31	10.115.78.68 – 10.115.78.69	10.115.78.69
36	10.115.78.70/31	10.115.78.70 – 10.115.78.71	10.115.78.71
37	10.115.78.72/31	10.115.78.72 – 10.115.78.73	10.115.78.73
38	10.115.78.74/31	10.115.78.74 – 10.115.78.75	10.115.78.75
39	10.115.78.76/31	10.115.78.76 – 10.115.78.77	10.115.78.77
40	10.115.78.78/31	10.115.78.78 – 10.115.78.79	10.115.78.79
41	10.115.78.80/31	10.115.78.80 – 10.115.78.81	10.115.78.81
42	10.115.78.82/31	10.115.78.82 – 10.115.78.83	10.115.78.83
43	10.115.78.84/31	10.115.78.84 – 10.115.78.85	10.115.78.85
44	10.115.78.86/31	10.115.78.86 – 10.115.78.87	10.115.78.87
45	10.115.78.88/31	10.115.78.88 – 10.115.78.89	10.115.78.89
46	10.115.78.90/31	10.115.78.90 – 10.115.78.91	10.115.78.91
47	10.115.78.92/31	10.115.78.92 – 10.115.78.93	10.115.78.93
48	10.115.78.94/31	10.115.78.94 – 10.115.78.95	10.115.78.95
49	10.115.78.96/31	10.115.78.96 – 10.115.78.97	10.115.78.97
50	10.115.78.98/31	10.115.78.98 – 10.115.78.99	10.115.78.99
51	10.115.78.100/31	10.115.78.100 – 10.115.78.101	10.115.78.101
52	10.115.78.102/31	10.115.78.102 – 10.115.78.103	10.115.78.103
53	10.115.78.104/31	10.115.78.104 – 10.115.78.105	10.115.78.105
54	10.115.78.106/31	10.115.78.106 – 10.115.78.107	10.115.78.107
55	10.115.78.108/31	10.115.78.108 – 10.115.78.109	10.115.78.109
56	10.115.78.110/31	10.115.78.110 – 10.115.78.111	10.115.78.111
57	10.115.78.112/31	10.115.78.112 – 10.115.78.113	10.115.78.113
58	10.115.78.114/31	10.115.78.114 – 10.115.78.115	10.115.78.115
59	10.115.78.116/31	10.115.78.116 – 10.115.78.117	10.115.78.117
60	10.115.78.118/31	10.115.78.118 – 10.115.78.119	10.115.78.119
61	10.115.78.120/31	10.115.78.120 – 10.115.78.121	10.115.78.121
62	10.115.78.122/31	10.115.78.122 – 10.115.78.123	10.115.78.123
63	10.115.78.124/31	10.115.78.124 – 10.115.78.125	10.115.78.125
64	10.115.78.126/31	10.115.78.126 – 10.115.78.127	10.115.78.127
65	10.115.78.128/31	10.115.78.128 – 10.115.78.129	10.115.78.129
66	10.115.78.130/31	10.115.78.130 – 10.115.78.131	10.115.78.131
67	10.115.78.132/31	10.115.78.132 – 10.115.78.133	10.115.78.133
68	10.115.78.134/31	10.115.78.134 – 10.115.78.135	10.115.78.135
69	10.115.78.136/31	10.115.78.136 – 10.115.78.137	10.115.78.137
70	10.115.78.138/31	10.115.78.138 – 10.115.78.139	10.115.78.139
71	10.115.78.140/31	10.115.78.140 – 10.115.78.141	10.115.78.141
72	10.115.78.142/31	10.115.78.142 – 10.115.78.143	10.115.78.143
73	10.115.78.144/31	10.115.78.144 – 10.115.78.145	10.115.78.145
74	10.115.78.146/31	10.115.78.146 – 10.115.78.147	10.115.78.147
75	10.115.78.148/31	10.115.78.148 – 10.115.78.149	10.115.78.149
76	10.115.78.150/31	10.115.78.150 – 10.115.78.151	10.115.78.151
77	10.115.78.152/31	10.115.78.152 – 10.115.78.153	10.115.78.153
78	10.115.78.154/31	10.115.78.154 – 10.115.78.155	10.115.78.155
79	10.115.78.156/31	10.115.78.156 – 10.115.78.157	10.115.78.157
80	10.115.78.158/31	10.115.78.158 – 10.115.78.159	10.115.78.159
81	10.115.78.160/31	10.115.78.160 – 10.115.78.161	10.115.78.161
82	10.115.78.162/31	10.115.78.162 – 10.115.78.163	10.115.78.163
83	10.115.78.164/31	10.115.78.164 – 10.115.78.165	10.115.78.165
84	10.115.78.166/31	10.115.78.166 – 10.115.78.167	10.115.78.167
85	10.115.78.168/31	10.115.78.168 – 10.115.78.169	10.115.78.169
86	10.115.78.170/31	10.115.78.170 – 10.115.78.171	10.115.78.171
87	10.115.78.172/31	10.115.78.172 – 10.115.78.173	10.115.78.173
88	10.115.78.174/31	10.115.78.174 – 10.115.78.175	10.115.78.175
89	10.115.78.176/31	10.115.78.176 – 10.115.78.177	10.115.78.177
90	10.115.78.178/31	10.115.78.178 – 10.115.78.179	10.115.78.179
91	10.115.78.180/31	10.115.78.180 – 10.115.78.181	10.115.78.181
92	10.115.78.182/31	10.115.78.182 – 10.115.78.183	10.115.78.183
93	10.115.78.184/31	10.115.78.184 – 10.115.78.185	10.115.78.185
94	10.115.78.186/31	10.115.78.186 – 10.115.78.187	10.115.78.187
95	10.115.78.188/31	10.115.78.188 – 10.115.78.189	10.115.78.189
96	10.115.78.190/31	10.115.78.190 – 10.115.78.191	10.115.78.191
97	10.115.78.192/31	10.115.78.192 – 10.115.78.193	10.115.78.193
98	10.115.78.194/31	10.115.78.194 – 10.115.78.195	10.115.78.195
99	10.115.78.196/31	10.115.78.196 – 10.115.78.197	10.115.78.197
100	10.115.78.198/31	10.115.78.198 – 10.115.78.199	10.115.78.199
101	10.115.78.200/31	10.115.78.200 – 10.115.78.201	10.115.78.201
102	10.115.78.202/31	10.115.78.202 – 10.115.78.203	10.115.78.203
103	10.115.78.204/31	10.115.78.204 – 10.115.78.205	10.115.78.205
104	10.115.78.206/31	10.115.78.206 – 10.115.78.207	10.115.78.207
105	10.115.78.208/31	10.115.78.208 – 10.115.78.209	10.115.78.209
106	10.115.78.210/31	10.115.78.210 – 10.115.78.211	10.115.78.211
107	10.115.78.212/31	10.115.78.212 – 10.115.78.213	10.115.78.213
108	10.115.78.214/31	10.115.78.214 – 10.115.78.215	10.115.78.215
109	10.115.78.216/31	10.115.78.216 – 10.115.78.217	10.115.78.217
110	10.115.78.218/31	10.115.78.218 – 10.115.78.219	10.115.78.219
111	10.115.78.220/31	10.115.78.220 – 10.115.78.221	10.115.78.221
112	10.115.78.222/31	10.115.78.222 – 10.115.78.223	10.115.78.223
113	10.115.78.224/31	10.115.78.224 – 10.115.78.225	10.115.78.225
114	10.115.78.226/31	10.115.78.226 – 10.115.78.227	10.115.78.227
115	10.115.78.228/31	10.115.78.228 – 10.115.78.229	10.115.78.229
116	10.115.78.230/31	10.115.78.230 – 10.115.78.231	10.115.78.231
117	10.115.78.232/31	10.115.78.232 – 10.115.78.233	10.115.78.233
118	10.115.78.234/31	10.115.78.234 – 10.115.78.235	10.115.78.235
119	10.115.78.236/31	10.115.78.236 – 10.115.78.237	10.115.78.237
120	10.115.78.238/31	10.115.78.238 – 10.115.78.239	10.115.78.239
121	10.115.78.240/31	10.115.78.240 – 10.115.78.241	10.115.78.241
122	10.115.78.242/31	10.115.78.242 – 10.115.78.243	10.115.78.243
123	10.115.78.244/31	10.115.78.244 – 10.115.78.245	10.115.78.245
124	10.115.78.246/31	10.115.78.246 – 10.115.78.247	10.115.78.247
125	10.115.78.248/31	10.115.78.248 – 10.115.78.249	10.115.78.249
126	10.115.78.250/31	10.115.78.250 – 10.115.78.251	10.115.78.251
127	10.115.78.252/31	10.115.78.252 – 10.115.78.253	10.115.78.253
128	10.115.78.254/31	10.115.78.254 – 10.115.78.255	10.115.78.255

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 →