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)10.78.232.128/25

network10.78.232.128/25

broadcast10.78.232.255

first host10.78.232.129

last host10.78.232.254

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.78.232.128/25

address00001010.01001110.11101000.10000000

subnet mask11111111.11111111.11111111.10000000

network00001010.01001110.11101000.10000000

broadcast00001010.01001110.11101000.11111111

green = network part, grey = host part

hex0x0a4ee880

decimal172943488

reverse dns128.232.78.10.in-addr.arpa

ipv4-mapped::ffff:a4e:e880

/25 split into /32 · 128 subnets

close ×

#	network	host range	broadcast
1	10.78.232.128/32	10.78.232.128 – 10.78.232.128	10.78.232.128
2	10.78.232.129/32	10.78.232.129 – 10.78.232.129	10.78.232.129
3	10.78.232.130/32	10.78.232.130 – 10.78.232.130	10.78.232.130
4	10.78.232.131/32	10.78.232.131 – 10.78.232.131	10.78.232.131
5	10.78.232.132/32	10.78.232.132 – 10.78.232.132	10.78.232.132
6	10.78.232.133/32	10.78.232.133 – 10.78.232.133	10.78.232.133
7	10.78.232.134/32	10.78.232.134 – 10.78.232.134	10.78.232.134
8	10.78.232.135/32	10.78.232.135 – 10.78.232.135	10.78.232.135
9	10.78.232.136/32	10.78.232.136 – 10.78.232.136	10.78.232.136
10	10.78.232.137/32	10.78.232.137 – 10.78.232.137	10.78.232.137
11	10.78.232.138/32	10.78.232.138 – 10.78.232.138	10.78.232.138
12	10.78.232.139/32	10.78.232.139 – 10.78.232.139	10.78.232.139
13	10.78.232.140/32	10.78.232.140 – 10.78.232.140	10.78.232.140
14	10.78.232.141/32	10.78.232.141 – 10.78.232.141	10.78.232.141
15	10.78.232.142/32	10.78.232.142 – 10.78.232.142	10.78.232.142
16	10.78.232.143/32	10.78.232.143 – 10.78.232.143	10.78.232.143
17	10.78.232.144/32	10.78.232.144 – 10.78.232.144	10.78.232.144
18	10.78.232.145/32	10.78.232.145 – 10.78.232.145	10.78.232.145
19	10.78.232.146/32	10.78.232.146 – 10.78.232.146	10.78.232.146
20	10.78.232.147/32	10.78.232.147 – 10.78.232.147	10.78.232.147
21	10.78.232.148/32	10.78.232.148 – 10.78.232.148	10.78.232.148
22	10.78.232.149/32	10.78.232.149 – 10.78.232.149	10.78.232.149
23	10.78.232.150/32	10.78.232.150 – 10.78.232.150	10.78.232.150
24	10.78.232.151/32	10.78.232.151 – 10.78.232.151	10.78.232.151
25	10.78.232.152/32	10.78.232.152 – 10.78.232.152	10.78.232.152
26	10.78.232.153/32	10.78.232.153 – 10.78.232.153	10.78.232.153
27	10.78.232.154/32	10.78.232.154 – 10.78.232.154	10.78.232.154
28	10.78.232.155/32	10.78.232.155 – 10.78.232.155	10.78.232.155
29	10.78.232.156/32	10.78.232.156 – 10.78.232.156	10.78.232.156
30	10.78.232.157/32	10.78.232.157 – 10.78.232.157	10.78.232.157
31	10.78.232.158/32	10.78.232.158 – 10.78.232.158	10.78.232.158
32	10.78.232.159/32	10.78.232.159 – 10.78.232.159	10.78.232.159
33	10.78.232.160/32	10.78.232.160 – 10.78.232.160	10.78.232.160
34	10.78.232.161/32	10.78.232.161 – 10.78.232.161	10.78.232.161
35	10.78.232.162/32	10.78.232.162 – 10.78.232.162	10.78.232.162
36	10.78.232.163/32	10.78.232.163 – 10.78.232.163	10.78.232.163
37	10.78.232.164/32	10.78.232.164 – 10.78.232.164	10.78.232.164
38	10.78.232.165/32	10.78.232.165 – 10.78.232.165	10.78.232.165
39	10.78.232.166/32	10.78.232.166 – 10.78.232.166	10.78.232.166
40	10.78.232.167/32	10.78.232.167 – 10.78.232.167	10.78.232.167
41	10.78.232.168/32	10.78.232.168 – 10.78.232.168	10.78.232.168
42	10.78.232.169/32	10.78.232.169 – 10.78.232.169	10.78.232.169
43	10.78.232.170/32	10.78.232.170 – 10.78.232.170	10.78.232.170
44	10.78.232.171/32	10.78.232.171 – 10.78.232.171	10.78.232.171
45	10.78.232.172/32	10.78.232.172 – 10.78.232.172	10.78.232.172
46	10.78.232.173/32	10.78.232.173 – 10.78.232.173	10.78.232.173
47	10.78.232.174/32	10.78.232.174 – 10.78.232.174	10.78.232.174
48	10.78.232.175/32	10.78.232.175 – 10.78.232.175	10.78.232.175
49	10.78.232.176/32	10.78.232.176 – 10.78.232.176	10.78.232.176
50	10.78.232.177/32	10.78.232.177 – 10.78.232.177	10.78.232.177
51	10.78.232.178/32	10.78.232.178 – 10.78.232.178	10.78.232.178
52	10.78.232.179/32	10.78.232.179 – 10.78.232.179	10.78.232.179
53	10.78.232.180/32	10.78.232.180 – 10.78.232.180	10.78.232.180
54	10.78.232.181/32	10.78.232.181 – 10.78.232.181	10.78.232.181
55	10.78.232.182/32	10.78.232.182 – 10.78.232.182	10.78.232.182
56	10.78.232.183/32	10.78.232.183 – 10.78.232.183	10.78.232.183
57	10.78.232.184/32	10.78.232.184 – 10.78.232.184	10.78.232.184
58	10.78.232.185/32	10.78.232.185 – 10.78.232.185	10.78.232.185
59	10.78.232.186/32	10.78.232.186 – 10.78.232.186	10.78.232.186
60	10.78.232.187/32	10.78.232.187 – 10.78.232.187	10.78.232.187
61	10.78.232.188/32	10.78.232.188 – 10.78.232.188	10.78.232.188
62	10.78.232.189/32	10.78.232.189 – 10.78.232.189	10.78.232.189
63	10.78.232.190/32	10.78.232.190 – 10.78.232.190	10.78.232.190
64	10.78.232.191/32	10.78.232.191 – 10.78.232.191	10.78.232.191
65	10.78.232.192/32	10.78.232.192 – 10.78.232.192	10.78.232.192
66	10.78.232.193/32	10.78.232.193 – 10.78.232.193	10.78.232.193
67	10.78.232.194/32	10.78.232.194 – 10.78.232.194	10.78.232.194
68	10.78.232.195/32	10.78.232.195 – 10.78.232.195	10.78.232.195
69	10.78.232.196/32	10.78.232.196 – 10.78.232.196	10.78.232.196
70	10.78.232.197/32	10.78.232.197 – 10.78.232.197	10.78.232.197
71	10.78.232.198/32	10.78.232.198 – 10.78.232.198	10.78.232.198
72	10.78.232.199/32	10.78.232.199 – 10.78.232.199	10.78.232.199
73	10.78.232.200/32	10.78.232.200 – 10.78.232.200	10.78.232.200
74	10.78.232.201/32	10.78.232.201 – 10.78.232.201	10.78.232.201
75	10.78.232.202/32	10.78.232.202 – 10.78.232.202	10.78.232.202
76	10.78.232.203/32	10.78.232.203 – 10.78.232.203	10.78.232.203
77	10.78.232.204/32	10.78.232.204 – 10.78.232.204	10.78.232.204
78	10.78.232.205/32	10.78.232.205 – 10.78.232.205	10.78.232.205
79	10.78.232.206/32	10.78.232.206 – 10.78.232.206	10.78.232.206
80	10.78.232.207/32	10.78.232.207 – 10.78.232.207	10.78.232.207
81	10.78.232.208/32	10.78.232.208 – 10.78.232.208	10.78.232.208
82	10.78.232.209/32	10.78.232.209 – 10.78.232.209	10.78.232.209
83	10.78.232.210/32	10.78.232.210 – 10.78.232.210	10.78.232.210
84	10.78.232.211/32	10.78.232.211 – 10.78.232.211	10.78.232.211
85	10.78.232.212/32	10.78.232.212 – 10.78.232.212	10.78.232.212
86	10.78.232.213/32	10.78.232.213 – 10.78.232.213	10.78.232.213
87	10.78.232.214/32	10.78.232.214 – 10.78.232.214	10.78.232.214
88	10.78.232.215/32	10.78.232.215 – 10.78.232.215	10.78.232.215
89	10.78.232.216/32	10.78.232.216 – 10.78.232.216	10.78.232.216
90	10.78.232.217/32	10.78.232.217 – 10.78.232.217	10.78.232.217
91	10.78.232.218/32	10.78.232.218 – 10.78.232.218	10.78.232.218
92	10.78.232.219/32	10.78.232.219 – 10.78.232.219	10.78.232.219
93	10.78.232.220/32	10.78.232.220 – 10.78.232.220	10.78.232.220
94	10.78.232.221/32	10.78.232.221 – 10.78.232.221	10.78.232.221
95	10.78.232.222/32	10.78.232.222 – 10.78.232.222	10.78.232.222
96	10.78.232.223/32	10.78.232.223 – 10.78.232.223	10.78.232.223
97	10.78.232.224/32	10.78.232.224 – 10.78.232.224	10.78.232.224
98	10.78.232.225/32	10.78.232.225 – 10.78.232.225	10.78.232.225
99	10.78.232.226/32	10.78.232.226 – 10.78.232.226	10.78.232.226
100	10.78.232.227/32	10.78.232.227 – 10.78.232.227	10.78.232.227
101	10.78.232.228/32	10.78.232.228 – 10.78.232.228	10.78.232.228
102	10.78.232.229/32	10.78.232.229 – 10.78.232.229	10.78.232.229
103	10.78.232.230/32	10.78.232.230 – 10.78.232.230	10.78.232.230
104	10.78.232.231/32	10.78.232.231 – 10.78.232.231	10.78.232.231
105	10.78.232.232/32	10.78.232.232 – 10.78.232.232	10.78.232.232
106	10.78.232.233/32	10.78.232.233 – 10.78.232.233	10.78.232.233
107	10.78.232.234/32	10.78.232.234 – 10.78.232.234	10.78.232.234
108	10.78.232.235/32	10.78.232.235 – 10.78.232.235	10.78.232.235
109	10.78.232.236/32	10.78.232.236 – 10.78.232.236	10.78.232.236
110	10.78.232.237/32	10.78.232.237 – 10.78.232.237	10.78.232.237
111	10.78.232.238/32	10.78.232.238 – 10.78.232.238	10.78.232.238
112	10.78.232.239/32	10.78.232.239 – 10.78.232.239	10.78.232.239
113	10.78.232.240/32	10.78.232.240 – 10.78.232.240	10.78.232.240
114	10.78.232.241/32	10.78.232.241 – 10.78.232.241	10.78.232.241
115	10.78.232.242/32	10.78.232.242 – 10.78.232.242	10.78.232.242
116	10.78.232.243/32	10.78.232.243 – 10.78.232.243	10.78.232.243
117	10.78.232.244/32	10.78.232.244 – 10.78.232.244	10.78.232.244
118	10.78.232.245/32	10.78.232.245 – 10.78.232.245	10.78.232.245
119	10.78.232.246/32	10.78.232.246 – 10.78.232.246	10.78.232.246
120	10.78.232.247/32	10.78.232.247 – 10.78.232.247	10.78.232.247
121	10.78.232.248/32	10.78.232.248 – 10.78.232.248	10.78.232.248
122	10.78.232.249/32	10.78.232.249 – 10.78.232.249	10.78.232.249
123	10.78.232.250/32	10.78.232.250 – 10.78.232.250	10.78.232.250
124	10.78.232.251/32	10.78.232.251 – 10.78.232.251	10.78.232.251
125	10.78.232.252/32	10.78.232.252 – 10.78.232.252	10.78.232.252
126	10.78.232.253/32	10.78.232.253 – 10.78.232.253	10.78.232.253
127	10.78.232.254/32	10.78.232.254 – 10.78.232.254	10.78.232.254
128	10.78.232.255/32	10.78.232.255 – 10.78.232.255	10.78.232.255

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 /25
/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	-
/25	255.255.255.128	128	126	1
/26	255.255.255.192	64	62	2 split →
/27	255.255.255.224	32	30	4 split →
/28	255.255.255.240	16	14	8 split →
/29	255.255.255.248	8	6	16 split →
/30	255.255.255.252	4	2	32 split →
/31	255.255.255.254	2	2	64 split →
/32	255.255.255.255	1	1	128 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 →