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)10.167.131.128/25

network10.167.131.128/25

broadcast10.167.131.255

first host10.167.131.129

last host10.167.131.254

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.167.131.128/25

address00001010.10100111.10000011.10000000

subnet mask11111111.11111111.11111111.10000000

network00001010.10100111.10000011.10000000

broadcast00001010.10100111.10000011.11111111

green = network part, grey = host part

hex0x0aa78380

decimal178750336

reverse dns128.131.167.10.in-addr.arpa

ipv4-mapped::ffff:aa7:8380

/25 split into /32 · 128 subnets

close ×

#	network	host range	broadcast
1	10.167.131.128/32	10.167.131.128 – 10.167.131.128	10.167.131.128
2	10.167.131.129/32	10.167.131.129 – 10.167.131.129	10.167.131.129
3	10.167.131.130/32	10.167.131.130 – 10.167.131.130	10.167.131.130
4	10.167.131.131/32	10.167.131.131 – 10.167.131.131	10.167.131.131
5	10.167.131.132/32	10.167.131.132 – 10.167.131.132	10.167.131.132
6	10.167.131.133/32	10.167.131.133 – 10.167.131.133	10.167.131.133
7	10.167.131.134/32	10.167.131.134 – 10.167.131.134	10.167.131.134
8	10.167.131.135/32	10.167.131.135 – 10.167.131.135	10.167.131.135
9	10.167.131.136/32	10.167.131.136 – 10.167.131.136	10.167.131.136
10	10.167.131.137/32	10.167.131.137 – 10.167.131.137	10.167.131.137
11	10.167.131.138/32	10.167.131.138 – 10.167.131.138	10.167.131.138
12	10.167.131.139/32	10.167.131.139 – 10.167.131.139	10.167.131.139
13	10.167.131.140/32	10.167.131.140 – 10.167.131.140	10.167.131.140
14	10.167.131.141/32	10.167.131.141 – 10.167.131.141	10.167.131.141
15	10.167.131.142/32	10.167.131.142 – 10.167.131.142	10.167.131.142
16	10.167.131.143/32	10.167.131.143 – 10.167.131.143	10.167.131.143
17	10.167.131.144/32	10.167.131.144 – 10.167.131.144	10.167.131.144
18	10.167.131.145/32	10.167.131.145 – 10.167.131.145	10.167.131.145
19	10.167.131.146/32	10.167.131.146 – 10.167.131.146	10.167.131.146
20	10.167.131.147/32	10.167.131.147 – 10.167.131.147	10.167.131.147
21	10.167.131.148/32	10.167.131.148 – 10.167.131.148	10.167.131.148
22	10.167.131.149/32	10.167.131.149 – 10.167.131.149	10.167.131.149
23	10.167.131.150/32	10.167.131.150 – 10.167.131.150	10.167.131.150
24	10.167.131.151/32	10.167.131.151 – 10.167.131.151	10.167.131.151
25	10.167.131.152/32	10.167.131.152 – 10.167.131.152	10.167.131.152
26	10.167.131.153/32	10.167.131.153 – 10.167.131.153	10.167.131.153
27	10.167.131.154/32	10.167.131.154 – 10.167.131.154	10.167.131.154
28	10.167.131.155/32	10.167.131.155 – 10.167.131.155	10.167.131.155
29	10.167.131.156/32	10.167.131.156 – 10.167.131.156	10.167.131.156
30	10.167.131.157/32	10.167.131.157 – 10.167.131.157	10.167.131.157
31	10.167.131.158/32	10.167.131.158 – 10.167.131.158	10.167.131.158
32	10.167.131.159/32	10.167.131.159 – 10.167.131.159	10.167.131.159
33	10.167.131.160/32	10.167.131.160 – 10.167.131.160	10.167.131.160
34	10.167.131.161/32	10.167.131.161 – 10.167.131.161	10.167.131.161
35	10.167.131.162/32	10.167.131.162 – 10.167.131.162	10.167.131.162
36	10.167.131.163/32	10.167.131.163 – 10.167.131.163	10.167.131.163
37	10.167.131.164/32	10.167.131.164 – 10.167.131.164	10.167.131.164
38	10.167.131.165/32	10.167.131.165 – 10.167.131.165	10.167.131.165
39	10.167.131.166/32	10.167.131.166 – 10.167.131.166	10.167.131.166
40	10.167.131.167/32	10.167.131.167 – 10.167.131.167	10.167.131.167
41	10.167.131.168/32	10.167.131.168 – 10.167.131.168	10.167.131.168
42	10.167.131.169/32	10.167.131.169 – 10.167.131.169	10.167.131.169
43	10.167.131.170/32	10.167.131.170 – 10.167.131.170	10.167.131.170
44	10.167.131.171/32	10.167.131.171 – 10.167.131.171	10.167.131.171
45	10.167.131.172/32	10.167.131.172 – 10.167.131.172	10.167.131.172
46	10.167.131.173/32	10.167.131.173 – 10.167.131.173	10.167.131.173
47	10.167.131.174/32	10.167.131.174 – 10.167.131.174	10.167.131.174
48	10.167.131.175/32	10.167.131.175 – 10.167.131.175	10.167.131.175
49	10.167.131.176/32	10.167.131.176 – 10.167.131.176	10.167.131.176
50	10.167.131.177/32	10.167.131.177 – 10.167.131.177	10.167.131.177
51	10.167.131.178/32	10.167.131.178 – 10.167.131.178	10.167.131.178
52	10.167.131.179/32	10.167.131.179 – 10.167.131.179	10.167.131.179
53	10.167.131.180/32	10.167.131.180 – 10.167.131.180	10.167.131.180
54	10.167.131.181/32	10.167.131.181 – 10.167.131.181	10.167.131.181
55	10.167.131.182/32	10.167.131.182 – 10.167.131.182	10.167.131.182
56	10.167.131.183/32	10.167.131.183 – 10.167.131.183	10.167.131.183
57	10.167.131.184/32	10.167.131.184 – 10.167.131.184	10.167.131.184
58	10.167.131.185/32	10.167.131.185 – 10.167.131.185	10.167.131.185
59	10.167.131.186/32	10.167.131.186 – 10.167.131.186	10.167.131.186
60	10.167.131.187/32	10.167.131.187 – 10.167.131.187	10.167.131.187
61	10.167.131.188/32	10.167.131.188 – 10.167.131.188	10.167.131.188
62	10.167.131.189/32	10.167.131.189 – 10.167.131.189	10.167.131.189
63	10.167.131.190/32	10.167.131.190 – 10.167.131.190	10.167.131.190
64	10.167.131.191/32	10.167.131.191 – 10.167.131.191	10.167.131.191
65	10.167.131.192/32	10.167.131.192 – 10.167.131.192	10.167.131.192
66	10.167.131.193/32	10.167.131.193 – 10.167.131.193	10.167.131.193
67	10.167.131.194/32	10.167.131.194 – 10.167.131.194	10.167.131.194
68	10.167.131.195/32	10.167.131.195 – 10.167.131.195	10.167.131.195
69	10.167.131.196/32	10.167.131.196 – 10.167.131.196	10.167.131.196
70	10.167.131.197/32	10.167.131.197 – 10.167.131.197	10.167.131.197
71	10.167.131.198/32	10.167.131.198 – 10.167.131.198	10.167.131.198
72	10.167.131.199/32	10.167.131.199 – 10.167.131.199	10.167.131.199
73	10.167.131.200/32	10.167.131.200 – 10.167.131.200	10.167.131.200
74	10.167.131.201/32	10.167.131.201 – 10.167.131.201	10.167.131.201
75	10.167.131.202/32	10.167.131.202 – 10.167.131.202	10.167.131.202
76	10.167.131.203/32	10.167.131.203 – 10.167.131.203	10.167.131.203
77	10.167.131.204/32	10.167.131.204 – 10.167.131.204	10.167.131.204
78	10.167.131.205/32	10.167.131.205 – 10.167.131.205	10.167.131.205
79	10.167.131.206/32	10.167.131.206 – 10.167.131.206	10.167.131.206
80	10.167.131.207/32	10.167.131.207 – 10.167.131.207	10.167.131.207
81	10.167.131.208/32	10.167.131.208 – 10.167.131.208	10.167.131.208
82	10.167.131.209/32	10.167.131.209 – 10.167.131.209	10.167.131.209
83	10.167.131.210/32	10.167.131.210 – 10.167.131.210	10.167.131.210
84	10.167.131.211/32	10.167.131.211 – 10.167.131.211	10.167.131.211
85	10.167.131.212/32	10.167.131.212 – 10.167.131.212	10.167.131.212
86	10.167.131.213/32	10.167.131.213 – 10.167.131.213	10.167.131.213
87	10.167.131.214/32	10.167.131.214 – 10.167.131.214	10.167.131.214
88	10.167.131.215/32	10.167.131.215 – 10.167.131.215	10.167.131.215
89	10.167.131.216/32	10.167.131.216 – 10.167.131.216	10.167.131.216
90	10.167.131.217/32	10.167.131.217 – 10.167.131.217	10.167.131.217
91	10.167.131.218/32	10.167.131.218 – 10.167.131.218	10.167.131.218
92	10.167.131.219/32	10.167.131.219 – 10.167.131.219	10.167.131.219
93	10.167.131.220/32	10.167.131.220 – 10.167.131.220	10.167.131.220
94	10.167.131.221/32	10.167.131.221 – 10.167.131.221	10.167.131.221
95	10.167.131.222/32	10.167.131.222 – 10.167.131.222	10.167.131.222
96	10.167.131.223/32	10.167.131.223 – 10.167.131.223	10.167.131.223
97	10.167.131.224/32	10.167.131.224 – 10.167.131.224	10.167.131.224
98	10.167.131.225/32	10.167.131.225 – 10.167.131.225	10.167.131.225
99	10.167.131.226/32	10.167.131.226 – 10.167.131.226	10.167.131.226
100	10.167.131.227/32	10.167.131.227 – 10.167.131.227	10.167.131.227
101	10.167.131.228/32	10.167.131.228 – 10.167.131.228	10.167.131.228
102	10.167.131.229/32	10.167.131.229 – 10.167.131.229	10.167.131.229
103	10.167.131.230/32	10.167.131.230 – 10.167.131.230	10.167.131.230
104	10.167.131.231/32	10.167.131.231 – 10.167.131.231	10.167.131.231
105	10.167.131.232/32	10.167.131.232 – 10.167.131.232	10.167.131.232
106	10.167.131.233/32	10.167.131.233 – 10.167.131.233	10.167.131.233
107	10.167.131.234/32	10.167.131.234 – 10.167.131.234	10.167.131.234
108	10.167.131.235/32	10.167.131.235 – 10.167.131.235	10.167.131.235
109	10.167.131.236/32	10.167.131.236 – 10.167.131.236	10.167.131.236
110	10.167.131.237/32	10.167.131.237 – 10.167.131.237	10.167.131.237
111	10.167.131.238/32	10.167.131.238 – 10.167.131.238	10.167.131.238
112	10.167.131.239/32	10.167.131.239 – 10.167.131.239	10.167.131.239
113	10.167.131.240/32	10.167.131.240 – 10.167.131.240	10.167.131.240
114	10.167.131.241/32	10.167.131.241 – 10.167.131.241	10.167.131.241
115	10.167.131.242/32	10.167.131.242 – 10.167.131.242	10.167.131.242
116	10.167.131.243/32	10.167.131.243 – 10.167.131.243	10.167.131.243
117	10.167.131.244/32	10.167.131.244 – 10.167.131.244	10.167.131.244
118	10.167.131.245/32	10.167.131.245 – 10.167.131.245	10.167.131.245
119	10.167.131.246/32	10.167.131.246 – 10.167.131.246	10.167.131.246
120	10.167.131.247/32	10.167.131.247 – 10.167.131.247	10.167.131.247
121	10.167.131.248/32	10.167.131.248 – 10.167.131.248	10.167.131.248
122	10.167.131.249/32	10.167.131.249 – 10.167.131.249	10.167.131.249
123	10.167.131.250/32	10.167.131.250 – 10.167.131.250	10.167.131.250
124	10.167.131.251/32	10.167.131.251 – 10.167.131.251	10.167.131.251
125	10.167.131.252/32	10.167.131.252 – 10.167.131.252	10.167.131.252
126	10.167.131.253/32	10.167.131.253 – 10.167.131.253	10.167.131.253
127	10.167.131.254/32	10.167.131.254 – 10.167.131.254	10.167.131.254
128	10.167.131.255/32	10.167.131.255 – 10.167.131.255	10.167.131.255

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 →