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)10.78.187.128/25

network10.78.187.128/25

broadcast10.78.187.255

first host10.78.187.129

last host10.78.187.254

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.78.187.128/25

address00001010.01001110.10111011.10000000

subnet mask11111111.11111111.11111111.10000000

network00001010.01001110.10111011.10000000

broadcast00001010.01001110.10111011.11111111

green = network part, grey = host part

hex0x0a4ebb80

decimal172931968

reverse dns128.187.78.10.in-addr.arpa

ipv4-mapped::ffff:a4e:bb80

/25 split into /32 · 128 subnets

close ×

#	network	host range	broadcast
1	10.78.187.128/32	10.78.187.128 – 10.78.187.128	10.78.187.128
2	10.78.187.129/32	10.78.187.129 – 10.78.187.129	10.78.187.129
3	10.78.187.130/32	10.78.187.130 – 10.78.187.130	10.78.187.130
4	10.78.187.131/32	10.78.187.131 – 10.78.187.131	10.78.187.131
5	10.78.187.132/32	10.78.187.132 – 10.78.187.132	10.78.187.132
6	10.78.187.133/32	10.78.187.133 – 10.78.187.133	10.78.187.133
7	10.78.187.134/32	10.78.187.134 – 10.78.187.134	10.78.187.134
8	10.78.187.135/32	10.78.187.135 – 10.78.187.135	10.78.187.135
9	10.78.187.136/32	10.78.187.136 – 10.78.187.136	10.78.187.136
10	10.78.187.137/32	10.78.187.137 – 10.78.187.137	10.78.187.137
11	10.78.187.138/32	10.78.187.138 – 10.78.187.138	10.78.187.138
12	10.78.187.139/32	10.78.187.139 – 10.78.187.139	10.78.187.139
13	10.78.187.140/32	10.78.187.140 – 10.78.187.140	10.78.187.140
14	10.78.187.141/32	10.78.187.141 – 10.78.187.141	10.78.187.141
15	10.78.187.142/32	10.78.187.142 – 10.78.187.142	10.78.187.142
16	10.78.187.143/32	10.78.187.143 – 10.78.187.143	10.78.187.143
17	10.78.187.144/32	10.78.187.144 – 10.78.187.144	10.78.187.144
18	10.78.187.145/32	10.78.187.145 – 10.78.187.145	10.78.187.145
19	10.78.187.146/32	10.78.187.146 – 10.78.187.146	10.78.187.146
20	10.78.187.147/32	10.78.187.147 – 10.78.187.147	10.78.187.147
21	10.78.187.148/32	10.78.187.148 – 10.78.187.148	10.78.187.148
22	10.78.187.149/32	10.78.187.149 – 10.78.187.149	10.78.187.149
23	10.78.187.150/32	10.78.187.150 – 10.78.187.150	10.78.187.150
24	10.78.187.151/32	10.78.187.151 – 10.78.187.151	10.78.187.151
25	10.78.187.152/32	10.78.187.152 – 10.78.187.152	10.78.187.152
26	10.78.187.153/32	10.78.187.153 – 10.78.187.153	10.78.187.153
27	10.78.187.154/32	10.78.187.154 – 10.78.187.154	10.78.187.154
28	10.78.187.155/32	10.78.187.155 – 10.78.187.155	10.78.187.155
29	10.78.187.156/32	10.78.187.156 – 10.78.187.156	10.78.187.156
30	10.78.187.157/32	10.78.187.157 – 10.78.187.157	10.78.187.157
31	10.78.187.158/32	10.78.187.158 – 10.78.187.158	10.78.187.158
32	10.78.187.159/32	10.78.187.159 – 10.78.187.159	10.78.187.159
33	10.78.187.160/32	10.78.187.160 – 10.78.187.160	10.78.187.160
34	10.78.187.161/32	10.78.187.161 – 10.78.187.161	10.78.187.161
35	10.78.187.162/32	10.78.187.162 – 10.78.187.162	10.78.187.162
36	10.78.187.163/32	10.78.187.163 – 10.78.187.163	10.78.187.163
37	10.78.187.164/32	10.78.187.164 – 10.78.187.164	10.78.187.164
38	10.78.187.165/32	10.78.187.165 – 10.78.187.165	10.78.187.165
39	10.78.187.166/32	10.78.187.166 – 10.78.187.166	10.78.187.166
40	10.78.187.167/32	10.78.187.167 – 10.78.187.167	10.78.187.167
41	10.78.187.168/32	10.78.187.168 – 10.78.187.168	10.78.187.168
42	10.78.187.169/32	10.78.187.169 – 10.78.187.169	10.78.187.169
43	10.78.187.170/32	10.78.187.170 – 10.78.187.170	10.78.187.170
44	10.78.187.171/32	10.78.187.171 – 10.78.187.171	10.78.187.171
45	10.78.187.172/32	10.78.187.172 – 10.78.187.172	10.78.187.172
46	10.78.187.173/32	10.78.187.173 – 10.78.187.173	10.78.187.173
47	10.78.187.174/32	10.78.187.174 – 10.78.187.174	10.78.187.174
48	10.78.187.175/32	10.78.187.175 – 10.78.187.175	10.78.187.175
49	10.78.187.176/32	10.78.187.176 – 10.78.187.176	10.78.187.176
50	10.78.187.177/32	10.78.187.177 – 10.78.187.177	10.78.187.177
51	10.78.187.178/32	10.78.187.178 – 10.78.187.178	10.78.187.178
52	10.78.187.179/32	10.78.187.179 – 10.78.187.179	10.78.187.179
53	10.78.187.180/32	10.78.187.180 – 10.78.187.180	10.78.187.180
54	10.78.187.181/32	10.78.187.181 – 10.78.187.181	10.78.187.181
55	10.78.187.182/32	10.78.187.182 – 10.78.187.182	10.78.187.182
56	10.78.187.183/32	10.78.187.183 – 10.78.187.183	10.78.187.183
57	10.78.187.184/32	10.78.187.184 – 10.78.187.184	10.78.187.184
58	10.78.187.185/32	10.78.187.185 – 10.78.187.185	10.78.187.185
59	10.78.187.186/32	10.78.187.186 – 10.78.187.186	10.78.187.186
60	10.78.187.187/32	10.78.187.187 – 10.78.187.187	10.78.187.187
61	10.78.187.188/32	10.78.187.188 – 10.78.187.188	10.78.187.188
62	10.78.187.189/32	10.78.187.189 – 10.78.187.189	10.78.187.189
63	10.78.187.190/32	10.78.187.190 – 10.78.187.190	10.78.187.190
64	10.78.187.191/32	10.78.187.191 – 10.78.187.191	10.78.187.191
65	10.78.187.192/32	10.78.187.192 – 10.78.187.192	10.78.187.192
66	10.78.187.193/32	10.78.187.193 – 10.78.187.193	10.78.187.193
67	10.78.187.194/32	10.78.187.194 – 10.78.187.194	10.78.187.194
68	10.78.187.195/32	10.78.187.195 – 10.78.187.195	10.78.187.195
69	10.78.187.196/32	10.78.187.196 – 10.78.187.196	10.78.187.196
70	10.78.187.197/32	10.78.187.197 – 10.78.187.197	10.78.187.197
71	10.78.187.198/32	10.78.187.198 – 10.78.187.198	10.78.187.198
72	10.78.187.199/32	10.78.187.199 – 10.78.187.199	10.78.187.199
73	10.78.187.200/32	10.78.187.200 – 10.78.187.200	10.78.187.200
74	10.78.187.201/32	10.78.187.201 – 10.78.187.201	10.78.187.201
75	10.78.187.202/32	10.78.187.202 – 10.78.187.202	10.78.187.202
76	10.78.187.203/32	10.78.187.203 – 10.78.187.203	10.78.187.203
77	10.78.187.204/32	10.78.187.204 – 10.78.187.204	10.78.187.204
78	10.78.187.205/32	10.78.187.205 – 10.78.187.205	10.78.187.205
79	10.78.187.206/32	10.78.187.206 – 10.78.187.206	10.78.187.206
80	10.78.187.207/32	10.78.187.207 – 10.78.187.207	10.78.187.207
81	10.78.187.208/32	10.78.187.208 – 10.78.187.208	10.78.187.208
82	10.78.187.209/32	10.78.187.209 – 10.78.187.209	10.78.187.209
83	10.78.187.210/32	10.78.187.210 – 10.78.187.210	10.78.187.210
84	10.78.187.211/32	10.78.187.211 – 10.78.187.211	10.78.187.211
85	10.78.187.212/32	10.78.187.212 – 10.78.187.212	10.78.187.212
86	10.78.187.213/32	10.78.187.213 – 10.78.187.213	10.78.187.213
87	10.78.187.214/32	10.78.187.214 – 10.78.187.214	10.78.187.214
88	10.78.187.215/32	10.78.187.215 – 10.78.187.215	10.78.187.215
89	10.78.187.216/32	10.78.187.216 – 10.78.187.216	10.78.187.216
90	10.78.187.217/32	10.78.187.217 – 10.78.187.217	10.78.187.217
91	10.78.187.218/32	10.78.187.218 – 10.78.187.218	10.78.187.218
92	10.78.187.219/32	10.78.187.219 – 10.78.187.219	10.78.187.219
93	10.78.187.220/32	10.78.187.220 – 10.78.187.220	10.78.187.220
94	10.78.187.221/32	10.78.187.221 – 10.78.187.221	10.78.187.221
95	10.78.187.222/32	10.78.187.222 – 10.78.187.222	10.78.187.222
96	10.78.187.223/32	10.78.187.223 – 10.78.187.223	10.78.187.223
97	10.78.187.224/32	10.78.187.224 – 10.78.187.224	10.78.187.224
98	10.78.187.225/32	10.78.187.225 – 10.78.187.225	10.78.187.225
99	10.78.187.226/32	10.78.187.226 – 10.78.187.226	10.78.187.226
100	10.78.187.227/32	10.78.187.227 – 10.78.187.227	10.78.187.227
101	10.78.187.228/32	10.78.187.228 – 10.78.187.228	10.78.187.228
102	10.78.187.229/32	10.78.187.229 – 10.78.187.229	10.78.187.229
103	10.78.187.230/32	10.78.187.230 – 10.78.187.230	10.78.187.230
104	10.78.187.231/32	10.78.187.231 – 10.78.187.231	10.78.187.231
105	10.78.187.232/32	10.78.187.232 – 10.78.187.232	10.78.187.232
106	10.78.187.233/32	10.78.187.233 – 10.78.187.233	10.78.187.233
107	10.78.187.234/32	10.78.187.234 – 10.78.187.234	10.78.187.234
108	10.78.187.235/32	10.78.187.235 – 10.78.187.235	10.78.187.235
109	10.78.187.236/32	10.78.187.236 – 10.78.187.236	10.78.187.236
110	10.78.187.237/32	10.78.187.237 – 10.78.187.237	10.78.187.237
111	10.78.187.238/32	10.78.187.238 – 10.78.187.238	10.78.187.238
112	10.78.187.239/32	10.78.187.239 – 10.78.187.239	10.78.187.239
113	10.78.187.240/32	10.78.187.240 – 10.78.187.240	10.78.187.240
114	10.78.187.241/32	10.78.187.241 – 10.78.187.241	10.78.187.241
115	10.78.187.242/32	10.78.187.242 – 10.78.187.242	10.78.187.242
116	10.78.187.243/32	10.78.187.243 – 10.78.187.243	10.78.187.243
117	10.78.187.244/32	10.78.187.244 – 10.78.187.244	10.78.187.244
118	10.78.187.245/32	10.78.187.245 – 10.78.187.245	10.78.187.245
119	10.78.187.246/32	10.78.187.246 – 10.78.187.246	10.78.187.246
120	10.78.187.247/32	10.78.187.247 – 10.78.187.247	10.78.187.247
121	10.78.187.248/32	10.78.187.248 – 10.78.187.248	10.78.187.248
122	10.78.187.249/32	10.78.187.249 – 10.78.187.249	10.78.187.249
123	10.78.187.250/32	10.78.187.250 – 10.78.187.250	10.78.187.250
124	10.78.187.251/32	10.78.187.251 – 10.78.187.251	10.78.187.251
125	10.78.187.252/32	10.78.187.252 – 10.78.187.252	10.78.187.252
126	10.78.187.253/32	10.78.187.253 – 10.78.187.253	10.78.187.253
127	10.78.187.254/32	10.78.187.254 – 10.78.187.254	10.78.187.254
128	10.78.187.255/32	10.78.187.255 – 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 /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 →