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)10.78.239.0/24

network10.78.239.0/24

broadcast10.78.239.255

first host10.78.239.1

last host10.78.239.254

subnet mask255.255.255.0

wildcard0.0.0.255

addresses256

usable hosts254

classA

ipcalc 10.78.239.0/24

address00001010.01001110.11101111.00000000

subnet mask11111111.11111111.11111111.00000000

network00001010.01001110.11101111.00000000

broadcast00001010.01001110.11101111.11111111

green = network part, grey = host part

hex0x0a4eef00

decimal172945152

reverse dns0.239.78.10.in-addr.arpa

ipv4-mapped::ffff:a4e:ef00

/24 split into /31 · 128 subnets

close ×

#	network	host range	broadcast
1	10.78.239.0/31	10.78.239.0 – 10.78.239.1	10.78.239.1
2	10.78.239.2/31	10.78.239.2 – 10.78.239.3	10.78.239.3
3	10.78.239.4/31	10.78.239.4 – 10.78.239.5	10.78.239.5
4	10.78.239.6/31	10.78.239.6 – 10.78.239.7	10.78.239.7
5	10.78.239.8/31	10.78.239.8 – 10.78.239.9	10.78.239.9
6	10.78.239.10/31	10.78.239.10 – 10.78.239.11	10.78.239.11
7	10.78.239.12/31	10.78.239.12 – 10.78.239.13	10.78.239.13
8	10.78.239.14/31	10.78.239.14 – 10.78.239.15	10.78.239.15
9	10.78.239.16/31	10.78.239.16 – 10.78.239.17	10.78.239.17
10	10.78.239.18/31	10.78.239.18 – 10.78.239.19	10.78.239.19
11	10.78.239.20/31	10.78.239.20 – 10.78.239.21	10.78.239.21
12	10.78.239.22/31	10.78.239.22 – 10.78.239.23	10.78.239.23
13	10.78.239.24/31	10.78.239.24 – 10.78.239.25	10.78.239.25
14	10.78.239.26/31	10.78.239.26 – 10.78.239.27	10.78.239.27
15	10.78.239.28/31	10.78.239.28 – 10.78.239.29	10.78.239.29
16	10.78.239.30/31	10.78.239.30 – 10.78.239.31	10.78.239.31
17	10.78.239.32/31	10.78.239.32 – 10.78.239.33	10.78.239.33
18	10.78.239.34/31	10.78.239.34 – 10.78.239.35	10.78.239.35
19	10.78.239.36/31	10.78.239.36 – 10.78.239.37	10.78.239.37
20	10.78.239.38/31	10.78.239.38 – 10.78.239.39	10.78.239.39
21	10.78.239.40/31	10.78.239.40 – 10.78.239.41	10.78.239.41
22	10.78.239.42/31	10.78.239.42 – 10.78.239.43	10.78.239.43
23	10.78.239.44/31	10.78.239.44 – 10.78.239.45	10.78.239.45
24	10.78.239.46/31	10.78.239.46 – 10.78.239.47	10.78.239.47
25	10.78.239.48/31	10.78.239.48 – 10.78.239.49	10.78.239.49
26	10.78.239.50/31	10.78.239.50 – 10.78.239.51	10.78.239.51
27	10.78.239.52/31	10.78.239.52 – 10.78.239.53	10.78.239.53
28	10.78.239.54/31	10.78.239.54 – 10.78.239.55	10.78.239.55
29	10.78.239.56/31	10.78.239.56 – 10.78.239.57	10.78.239.57
30	10.78.239.58/31	10.78.239.58 – 10.78.239.59	10.78.239.59
31	10.78.239.60/31	10.78.239.60 – 10.78.239.61	10.78.239.61
32	10.78.239.62/31	10.78.239.62 – 10.78.239.63	10.78.239.63
33	10.78.239.64/31	10.78.239.64 – 10.78.239.65	10.78.239.65
34	10.78.239.66/31	10.78.239.66 – 10.78.239.67	10.78.239.67
35	10.78.239.68/31	10.78.239.68 – 10.78.239.69	10.78.239.69
36	10.78.239.70/31	10.78.239.70 – 10.78.239.71	10.78.239.71
37	10.78.239.72/31	10.78.239.72 – 10.78.239.73	10.78.239.73
38	10.78.239.74/31	10.78.239.74 – 10.78.239.75	10.78.239.75
39	10.78.239.76/31	10.78.239.76 – 10.78.239.77	10.78.239.77
40	10.78.239.78/31	10.78.239.78 – 10.78.239.79	10.78.239.79
41	10.78.239.80/31	10.78.239.80 – 10.78.239.81	10.78.239.81
42	10.78.239.82/31	10.78.239.82 – 10.78.239.83	10.78.239.83
43	10.78.239.84/31	10.78.239.84 – 10.78.239.85	10.78.239.85
44	10.78.239.86/31	10.78.239.86 – 10.78.239.87	10.78.239.87
45	10.78.239.88/31	10.78.239.88 – 10.78.239.89	10.78.239.89
46	10.78.239.90/31	10.78.239.90 – 10.78.239.91	10.78.239.91
47	10.78.239.92/31	10.78.239.92 – 10.78.239.93	10.78.239.93
48	10.78.239.94/31	10.78.239.94 – 10.78.239.95	10.78.239.95
49	10.78.239.96/31	10.78.239.96 – 10.78.239.97	10.78.239.97
50	10.78.239.98/31	10.78.239.98 – 10.78.239.99	10.78.239.99
51	10.78.239.100/31	10.78.239.100 – 10.78.239.101	10.78.239.101
52	10.78.239.102/31	10.78.239.102 – 10.78.239.103	10.78.239.103
53	10.78.239.104/31	10.78.239.104 – 10.78.239.105	10.78.239.105
54	10.78.239.106/31	10.78.239.106 – 10.78.239.107	10.78.239.107
55	10.78.239.108/31	10.78.239.108 – 10.78.239.109	10.78.239.109
56	10.78.239.110/31	10.78.239.110 – 10.78.239.111	10.78.239.111
57	10.78.239.112/31	10.78.239.112 – 10.78.239.113	10.78.239.113
58	10.78.239.114/31	10.78.239.114 – 10.78.239.115	10.78.239.115
59	10.78.239.116/31	10.78.239.116 – 10.78.239.117	10.78.239.117
60	10.78.239.118/31	10.78.239.118 – 10.78.239.119	10.78.239.119
61	10.78.239.120/31	10.78.239.120 – 10.78.239.121	10.78.239.121
62	10.78.239.122/31	10.78.239.122 – 10.78.239.123	10.78.239.123
63	10.78.239.124/31	10.78.239.124 – 10.78.239.125	10.78.239.125
64	10.78.239.126/31	10.78.239.126 – 10.78.239.127	10.78.239.127
65	10.78.239.128/31	10.78.239.128 – 10.78.239.129	10.78.239.129
66	10.78.239.130/31	10.78.239.130 – 10.78.239.131	10.78.239.131
67	10.78.239.132/31	10.78.239.132 – 10.78.239.133	10.78.239.133
68	10.78.239.134/31	10.78.239.134 – 10.78.239.135	10.78.239.135
69	10.78.239.136/31	10.78.239.136 – 10.78.239.137	10.78.239.137
70	10.78.239.138/31	10.78.239.138 – 10.78.239.139	10.78.239.139
71	10.78.239.140/31	10.78.239.140 – 10.78.239.141	10.78.239.141
72	10.78.239.142/31	10.78.239.142 – 10.78.239.143	10.78.239.143
73	10.78.239.144/31	10.78.239.144 – 10.78.239.145	10.78.239.145
74	10.78.239.146/31	10.78.239.146 – 10.78.239.147	10.78.239.147
75	10.78.239.148/31	10.78.239.148 – 10.78.239.149	10.78.239.149
76	10.78.239.150/31	10.78.239.150 – 10.78.239.151	10.78.239.151
77	10.78.239.152/31	10.78.239.152 – 10.78.239.153	10.78.239.153
78	10.78.239.154/31	10.78.239.154 – 10.78.239.155	10.78.239.155
79	10.78.239.156/31	10.78.239.156 – 10.78.239.157	10.78.239.157
80	10.78.239.158/31	10.78.239.158 – 10.78.239.159	10.78.239.159
81	10.78.239.160/31	10.78.239.160 – 10.78.239.161	10.78.239.161
82	10.78.239.162/31	10.78.239.162 – 10.78.239.163	10.78.239.163
83	10.78.239.164/31	10.78.239.164 – 10.78.239.165	10.78.239.165
84	10.78.239.166/31	10.78.239.166 – 10.78.239.167	10.78.239.167
85	10.78.239.168/31	10.78.239.168 – 10.78.239.169	10.78.239.169
86	10.78.239.170/31	10.78.239.170 – 10.78.239.171	10.78.239.171
87	10.78.239.172/31	10.78.239.172 – 10.78.239.173	10.78.239.173
88	10.78.239.174/31	10.78.239.174 – 10.78.239.175	10.78.239.175
89	10.78.239.176/31	10.78.239.176 – 10.78.239.177	10.78.239.177
90	10.78.239.178/31	10.78.239.178 – 10.78.239.179	10.78.239.179
91	10.78.239.180/31	10.78.239.180 – 10.78.239.181	10.78.239.181
92	10.78.239.182/31	10.78.239.182 – 10.78.239.183	10.78.239.183
93	10.78.239.184/31	10.78.239.184 – 10.78.239.185	10.78.239.185
94	10.78.239.186/31	10.78.239.186 – 10.78.239.187	10.78.239.187
95	10.78.239.188/31	10.78.239.188 – 10.78.239.189	10.78.239.189
96	10.78.239.190/31	10.78.239.190 – 10.78.239.191	10.78.239.191
97	10.78.239.192/31	10.78.239.192 – 10.78.239.193	10.78.239.193
98	10.78.239.194/31	10.78.239.194 – 10.78.239.195	10.78.239.195
99	10.78.239.196/31	10.78.239.196 – 10.78.239.197	10.78.239.197
100	10.78.239.198/31	10.78.239.198 – 10.78.239.199	10.78.239.199
101	10.78.239.200/31	10.78.239.200 – 10.78.239.201	10.78.239.201
102	10.78.239.202/31	10.78.239.202 – 10.78.239.203	10.78.239.203
103	10.78.239.204/31	10.78.239.204 – 10.78.239.205	10.78.239.205
104	10.78.239.206/31	10.78.239.206 – 10.78.239.207	10.78.239.207
105	10.78.239.208/31	10.78.239.208 – 10.78.239.209	10.78.239.209
106	10.78.239.210/31	10.78.239.210 – 10.78.239.211	10.78.239.211
107	10.78.239.212/31	10.78.239.212 – 10.78.239.213	10.78.239.213
108	10.78.239.214/31	10.78.239.214 – 10.78.239.215	10.78.239.215
109	10.78.239.216/31	10.78.239.216 – 10.78.239.217	10.78.239.217
110	10.78.239.218/31	10.78.239.218 – 10.78.239.219	10.78.239.219
111	10.78.239.220/31	10.78.239.220 – 10.78.239.221	10.78.239.221
112	10.78.239.222/31	10.78.239.222 – 10.78.239.223	10.78.239.223
113	10.78.239.224/31	10.78.239.224 – 10.78.239.225	10.78.239.225
114	10.78.239.226/31	10.78.239.226 – 10.78.239.227	10.78.239.227
115	10.78.239.228/31	10.78.239.228 – 10.78.239.229	10.78.239.229
116	10.78.239.230/31	10.78.239.230 – 10.78.239.231	10.78.239.231
117	10.78.239.232/31	10.78.239.232 – 10.78.239.233	10.78.239.233
118	10.78.239.234/31	10.78.239.234 – 10.78.239.235	10.78.239.235
119	10.78.239.236/31	10.78.239.236 – 10.78.239.237	10.78.239.237
120	10.78.239.238/31	10.78.239.238 – 10.78.239.239	10.78.239.239
121	10.78.239.240/31	10.78.239.240 – 10.78.239.241	10.78.239.241
122	10.78.239.242/31	10.78.239.242 – 10.78.239.243	10.78.239.243
123	10.78.239.244/31	10.78.239.244 – 10.78.239.245	10.78.239.245
124	10.78.239.246/31	10.78.239.246 – 10.78.239.247	10.78.239.247
125	10.78.239.248/31	10.78.239.248 – 10.78.239.249	10.78.239.249
126	10.78.239.250/31	10.78.239.250 – 10.78.239.251	10.78.239.251
127	10.78.239.252/31	10.78.239.252 – 10.78.239.253	10.78.239.253
128	10.78.239.254/31	10.78.239.254 – 10.78.239.255	10.78.239.255

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 →