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)10.167.50.128/25

network10.167.50.128/25

broadcast10.167.50.255

first host10.167.50.129

last host10.167.50.254

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.167.50.128/25

address00001010.10100111.00110010.10000000

subnet mask11111111.11111111.11111111.10000000

network00001010.10100111.00110010.10000000

broadcast00001010.10100111.00110010.11111111

green = network part, grey = host part

hex0x0aa73280

decimal178729600

reverse dns128.50.167.10.in-addr.arpa

ipv4-mapped::ffff:aa7:3280

/25 split into /32 · 128 subnets

close ×

#	network	host range	broadcast
1	10.167.50.128/32	10.167.50.128 – 10.167.50.128	10.167.50.128
2	10.167.50.129/32	10.167.50.129 – 10.167.50.129	10.167.50.129
3	10.167.50.130/32	10.167.50.130 – 10.167.50.130	10.167.50.130
4	10.167.50.131/32	10.167.50.131 – 10.167.50.131	10.167.50.131
5	10.167.50.132/32	10.167.50.132 – 10.167.50.132	10.167.50.132
6	10.167.50.133/32	10.167.50.133 – 10.167.50.133	10.167.50.133
7	10.167.50.134/32	10.167.50.134 – 10.167.50.134	10.167.50.134
8	10.167.50.135/32	10.167.50.135 – 10.167.50.135	10.167.50.135
9	10.167.50.136/32	10.167.50.136 – 10.167.50.136	10.167.50.136
10	10.167.50.137/32	10.167.50.137 – 10.167.50.137	10.167.50.137
11	10.167.50.138/32	10.167.50.138 – 10.167.50.138	10.167.50.138
12	10.167.50.139/32	10.167.50.139 – 10.167.50.139	10.167.50.139
13	10.167.50.140/32	10.167.50.140 – 10.167.50.140	10.167.50.140
14	10.167.50.141/32	10.167.50.141 – 10.167.50.141	10.167.50.141
15	10.167.50.142/32	10.167.50.142 – 10.167.50.142	10.167.50.142
16	10.167.50.143/32	10.167.50.143 – 10.167.50.143	10.167.50.143
17	10.167.50.144/32	10.167.50.144 – 10.167.50.144	10.167.50.144
18	10.167.50.145/32	10.167.50.145 – 10.167.50.145	10.167.50.145
19	10.167.50.146/32	10.167.50.146 – 10.167.50.146	10.167.50.146
20	10.167.50.147/32	10.167.50.147 – 10.167.50.147	10.167.50.147
21	10.167.50.148/32	10.167.50.148 – 10.167.50.148	10.167.50.148
22	10.167.50.149/32	10.167.50.149 – 10.167.50.149	10.167.50.149
23	10.167.50.150/32	10.167.50.150 – 10.167.50.150	10.167.50.150
24	10.167.50.151/32	10.167.50.151 – 10.167.50.151	10.167.50.151
25	10.167.50.152/32	10.167.50.152 – 10.167.50.152	10.167.50.152
26	10.167.50.153/32	10.167.50.153 – 10.167.50.153	10.167.50.153
27	10.167.50.154/32	10.167.50.154 – 10.167.50.154	10.167.50.154
28	10.167.50.155/32	10.167.50.155 – 10.167.50.155	10.167.50.155
29	10.167.50.156/32	10.167.50.156 – 10.167.50.156	10.167.50.156
30	10.167.50.157/32	10.167.50.157 – 10.167.50.157	10.167.50.157
31	10.167.50.158/32	10.167.50.158 – 10.167.50.158	10.167.50.158
32	10.167.50.159/32	10.167.50.159 – 10.167.50.159	10.167.50.159
33	10.167.50.160/32	10.167.50.160 – 10.167.50.160	10.167.50.160
34	10.167.50.161/32	10.167.50.161 – 10.167.50.161	10.167.50.161
35	10.167.50.162/32	10.167.50.162 – 10.167.50.162	10.167.50.162
36	10.167.50.163/32	10.167.50.163 – 10.167.50.163	10.167.50.163
37	10.167.50.164/32	10.167.50.164 – 10.167.50.164	10.167.50.164
38	10.167.50.165/32	10.167.50.165 – 10.167.50.165	10.167.50.165
39	10.167.50.166/32	10.167.50.166 – 10.167.50.166	10.167.50.166
40	10.167.50.167/32	10.167.50.167 – 10.167.50.167	10.167.50.167
41	10.167.50.168/32	10.167.50.168 – 10.167.50.168	10.167.50.168
42	10.167.50.169/32	10.167.50.169 – 10.167.50.169	10.167.50.169
43	10.167.50.170/32	10.167.50.170 – 10.167.50.170	10.167.50.170
44	10.167.50.171/32	10.167.50.171 – 10.167.50.171	10.167.50.171
45	10.167.50.172/32	10.167.50.172 – 10.167.50.172	10.167.50.172
46	10.167.50.173/32	10.167.50.173 – 10.167.50.173	10.167.50.173
47	10.167.50.174/32	10.167.50.174 – 10.167.50.174	10.167.50.174
48	10.167.50.175/32	10.167.50.175 – 10.167.50.175	10.167.50.175
49	10.167.50.176/32	10.167.50.176 – 10.167.50.176	10.167.50.176
50	10.167.50.177/32	10.167.50.177 – 10.167.50.177	10.167.50.177
51	10.167.50.178/32	10.167.50.178 – 10.167.50.178	10.167.50.178
52	10.167.50.179/32	10.167.50.179 – 10.167.50.179	10.167.50.179
53	10.167.50.180/32	10.167.50.180 – 10.167.50.180	10.167.50.180
54	10.167.50.181/32	10.167.50.181 – 10.167.50.181	10.167.50.181
55	10.167.50.182/32	10.167.50.182 – 10.167.50.182	10.167.50.182
56	10.167.50.183/32	10.167.50.183 – 10.167.50.183	10.167.50.183
57	10.167.50.184/32	10.167.50.184 – 10.167.50.184	10.167.50.184
58	10.167.50.185/32	10.167.50.185 – 10.167.50.185	10.167.50.185
59	10.167.50.186/32	10.167.50.186 – 10.167.50.186	10.167.50.186
60	10.167.50.187/32	10.167.50.187 – 10.167.50.187	10.167.50.187
61	10.167.50.188/32	10.167.50.188 – 10.167.50.188	10.167.50.188
62	10.167.50.189/32	10.167.50.189 – 10.167.50.189	10.167.50.189
63	10.167.50.190/32	10.167.50.190 – 10.167.50.190	10.167.50.190
64	10.167.50.191/32	10.167.50.191 – 10.167.50.191	10.167.50.191
65	10.167.50.192/32	10.167.50.192 – 10.167.50.192	10.167.50.192
66	10.167.50.193/32	10.167.50.193 – 10.167.50.193	10.167.50.193
67	10.167.50.194/32	10.167.50.194 – 10.167.50.194	10.167.50.194
68	10.167.50.195/32	10.167.50.195 – 10.167.50.195	10.167.50.195
69	10.167.50.196/32	10.167.50.196 – 10.167.50.196	10.167.50.196
70	10.167.50.197/32	10.167.50.197 – 10.167.50.197	10.167.50.197
71	10.167.50.198/32	10.167.50.198 – 10.167.50.198	10.167.50.198
72	10.167.50.199/32	10.167.50.199 – 10.167.50.199	10.167.50.199
73	10.167.50.200/32	10.167.50.200 – 10.167.50.200	10.167.50.200
74	10.167.50.201/32	10.167.50.201 – 10.167.50.201	10.167.50.201
75	10.167.50.202/32	10.167.50.202 – 10.167.50.202	10.167.50.202
76	10.167.50.203/32	10.167.50.203 – 10.167.50.203	10.167.50.203
77	10.167.50.204/32	10.167.50.204 – 10.167.50.204	10.167.50.204
78	10.167.50.205/32	10.167.50.205 – 10.167.50.205	10.167.50.205
79	10.167.50.206/32	10.167.50.206 – 10.167.50.206	10.167.50.206
80	10.167.50.207/32	10.167.50.207 – 10.167.50.207	10.167.50.207
81	10.167.50.208/32	10.167.50.208 – 10.167.50.208	10.167.50.208
82	10.167.50.209/32	10.167.50.209 – 10.167.50.209	10.167.50.209
83	10.167.50.210/32	10.167.50.210 – 10.167.50.210	10.167.50.210
84	10.167.50.211/32	10.167.50.211 – 10.167.50.211	10.167.50.211
85	10.167.50.212/32	10.167.50.212 – 10.167.50.212	10.167.50.212
86	10.167.50.213/32	10.167.50.213 – 10.167.50.213	10.167.50.213
87	10.167.50.214/32	10.167.50.214 – 10.167.50.214	10.167.50.214
88	10.167.50.215/32	10.167.50.215 – 10.167.50.215	10.167.50.215
89	10.167.50.216/32	10.167.50.216 – 10.167.50.216	10.167.50.216
90	10.167.50.217/32	10.167.50.217 – 10.167.50.217	10.167.50.217
91	10.167.50.218/32	10.167.50.218 – 10.167.50.218	10.167.50.218
92	10.167.50.219/32	10.167.50.219 – 10.167.50.219	10.167.50.219
93	10.167.50.220/32	10.167.50.220 – 10.167.50.220	10.167.50.220
94	10.167.50.221/32	10.167.50.221 – 10.167.50.221	10.167.50.221
95	10.167.50.222/32	10.167.50.222 – 10.167.50.222	10.167.50.222
96	10.167.50.223/32	10.167.50.223 – 10.167.50.223	10.167.50.223
97	10.167.50.224/32	10.167.50.224 – 10.167.50.224	10.167.50.224
98	10.167.50.225/32	10.167.50.225 – 10.167.50.225	10.167.50.225
99	10.167.50.226/32	10.167.50.226 – 10.167.50.226	10.167.50.226
100	10.167.50.227/32	10.167.50.227 – 10.167.50.227	10.167.50.227
101	10.167.50.228/32	10.167.50.228 – 10.167.50.228	10.167.50.228
102	10.167.50.229/32	10.167.50.229 – 10.167.50.229	10.167.50.229
103	10.167.50.230/32	10.167.50.230 – 10.167.50.230	10.167.50.230
104	10.167.50.231/32	10.167.50.231 – 10.167.50.231	10.167.50.231
105	10.167.50.232/32	10.167.50.232 – 10.167.50.232	10.167.50.232
106	10.167.50.233/32	10.167.50.233 – 10.167.50.233	10.167.50.233
107	10.167.50.234/32	10.167.50.234 – 10.167.50.234	10.167.50.234
108	10.167.50.235/32	10.167.50.235 – 10.167.50.235	10.167.50.235
109	10.167.50.236/32	10.167.50.236 – 10.167.50.236	10.167.50.236
110	10.167.50.237/32	10.167.50.237 – 10.167.50.237	10.167.50.237
111	10.167.50.238/32	10.167.50.238 – 10.167.50.238	10.167.50.238
112	10.167.50.239/32	10.167.50.239 – 10.167.50.239	10.167.50.239
113	10.167.50.240/32	10.167.50.240 – 10.167.50.240	10.167.50.240
114	10.167.50.241/32	10.167.50.241 – 10.167.50.241	10.167.50.241
115	10.167.50.242/32	10.167.50.242 – 10.167.50.242	10.167.50.242
116	10.167.50.243/32	10.167.50.243 – 10.167.50.243	10.167.50.243
117	10.167.50.244/32	10.167.50.244 – 10.167.50.244	10.167.50.244
118	10.167.50.245/32	10.167.50.245 – 10.167.50.245	10.167.50.245
119	10.167.50.246/32	10.167.50.246 – 10.167.50.246	10.167.50.246
120	10.167.50.247/32	10.167.50.247 – 10.167.50.247	10.167.50.247
121	10.167.50.248/32	10.167.50.248 – 10.167.50.248	10.167.50.248
122	10.167.50.249/32	10.167.50.249 – 10.167.50.249	10.167.50.249
123	10.167.50.250/32	10.167.50.250 – 10.167.50.250	10.167.50.250
124	10.167.50.251/32	10.167.50.251 – 10.167.50.251	10.167.50.251
125	10.167.50.252/32	10.167.50.252 – 10.167.50.252	10.167.50.252
126	10.167.50.253/32	10.167.50.253 – 10.167.50.253	10.167.50.253
127	10.167.50.254/32	10.167.50.254 – 10.167.50.254	10.167.50.254
128	10.167.50.255/32	10.167.50.255 – 10.167.50.255	10.167.50.255

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 →