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)10.167.91.128/25

network10.167.91.128/25

broadcast10.167.91.255

first host10.167.91.129

last host10.167.91.254

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.167.91.128/25

address00001010.10100111.01011011.10000000

subnet mask11111111.11111111.11111111.10000000

network00001010.10100111.01011011.10000000

broadcast00001010.10100111.01011011.11111111

green = network part, grey = host part

hex0x0aa75b80

decimal178740096

reverse dns128.91.167.10.in-addr.arpa

ipv4-mapped::ffff:aa7:5b80

/25 split into /32 · 128 subnets

close ×

#	network	host range	broadcast
1	10.167.91.128/32	10.167.91.128 – 10.167.91.128	10.167.91.128
2	10.167.91.129/32	10.167.91.129 – 10.167.91.129	10.167.91.129
3	10.167.91.130/32	10.167.91.130 – 10.167.91.130	10.167.91.130
4	10.167.91.131/32	10.167.91.131 – 10.167.91.131	10.167.91.131
5	10.167.91.132/32	10.167.91.132 – 10.167.91.132	10.167.91.132
6	10.167.91.133/32	10.167.91.133 – 10.167.91.133	10.167.91.133
7	10.167.91.134/32	10.167.91.134 – 10.167.91.134	10.167.91.134
8	10.167.91.135/32	10.167.91.135 – 10.167.91.135	10.167.91.135
9	10.167.91.136/32	10.167.91.136 – 10.167.91.136	10.167.91.136
10	10.167.91.137/32	10.167.91.137 – 10.167.91.137	10.167.91.137
11	10.167.91.138/32	10.167.91.138 – 10.167.91.138	10.167.91.138
12	10.167.91.139/32	10.167.91.139 – 10.167.91.139	10.167.91.139
13	10.167.91.140/32	10.167.91.140 – 10.167.91.140	10.167.91.140
14	10.167.91.141/32	10.167.91.141 – 10.167.91.141	10.167.91.141
15	10.167.91.142/32	10.167.91.142 – 10.167.91.142	10.167.91.142
16	10.167.91.143/32	10.167.91.143 – 10.167.91.143	10.167.91.143
17	10.167.91.144/32	10.167.91.144 – 10.167.91.144	10.167.91.144
18	10.167.91.145/32	10.167.91.145 – 10.167.91.145	10.167.91.145
19	10.167.91.146/32	10.167.91.146 – 10.167.91.146	10.167.91.146
20	10.167.91.147/32	10.167.91.147 – 10.167.91.147	10.167.91.147
21	10.167.91.148/32	10.167.91.148 – 10.167.91.148	10.167.91.148
22	10.167.91.149/32	10.167.91.149 – 10.167.91.149	10.167.91.149
23	10.167.91.150/32	10.167.91.150 – 10.167.91.150	10.167.91.150
24	10.167.91.151/32	10.167.91.151 – 10.167.91.151	10.167.91.151
25	10.167.91.152/32	10.167.91.152 – 10.167.91.152	10.167.91.152
26	10.167.91.153/32	10.167.91.153 – 10.167.91.153	10.167.91.153
27	10.167.91.154/32	10.167.91.154 – 10.167.91.154	10.167.91.154
28	10.167.91.155/32	10.167.91.155 – 10.167.91.155	10.167.91.155
29	10.167.91.156/32	10.167.91.156 – 10.167.91.156	10.167.91.156
30	10.167.91.157/32	10.167.91.157 – 10.167.91.157	10.167.91.157
31	10.167.91.158/32	10.167.91.158 – 10.167.91.158	10.167.91.158
32	10.167.91.159/32	10.167.91.159 – 10.167.91.159	10.167.91.159
33	10.167.91.160/32	10.167.91.160 – 10.167.91.160	10.167.91.160
34	10.167.91.161/32	10.167.91.161 – 10.167.91.161	10.167.91.161
35	10.167.91.162/32	10.167.91.162 – 10.167.91.162	10.167.91.162
36	10.167.91.163/32	10.167.91.163 – 10.167.91.163	10.167.91.163
37	10.167.91.164/32	10.167.91.164 – 10.167.91.164	10.167.91.164
38	10.167.91.165/32	10.167.91.165 – 10.167.91.165	10.167.91.165
39	10.167.91.166/32	10.167.91.166 – 10.167.91.166	10.167.91.166
40	10.167.91.167/32	10.167.91.167 – 10.167.91.167	10.167.91.167
41	10.167.91.168/32	10.167.91.168 – 10.167.91.168	10.167.91.168
42	10.167.91.169/32	10.167.91.169 – 10.167.91.169	10.167.91.169
43	10.167.91.170/32	10.167.91.170 – 10.167.91.170	10.167.91.170
44	10.167.91.171/32	10.167.91.171 – 10.167.91.171	10.167.91.171
45	10.167.91.172/32	10.167.91.172 – 10.167.91.172	10.167.91.172
46	10.167.91.173/32	10.167.91.173 – 10.167.91.173	10.167.91.173
47	10.167.91.174/32	10.167.91.174 – 10.167.91.174	10.167.91.174
48	10.167.91.175/32	10.167.91.175 – 10.167.91.175	10.167.91.175
49	10.167.91.176/32	10.167.91.176 – 10.167.91.176	10.167.91.176
50	10.167.91.177/32	10.167.91.177 – 10.167.91.177	10.167.91.177
51	10.167.91.178/32	10.167.91.178 – 10.167.91.178	10.167.91.178
52	10.167.91.179/32	10.167.91.179 – 10.167.91.179	10.167.91.179
53	10.167.91.180/32	10.167.91.180 – 10.167.91.180	10.167.91.180
54	10.167.91.181/32	10.167.91.181 – 10.167.91.181	10.167.91.181
55	10.167.91.182/32	10.167.91.182 – 10.167.91.182	10.167.91.182
56	10.167.91.183/32	10.167.91.183 – 10.167.91.183	10.167.91.183
57	10.167.91.184/32	10.167.91.184 – 10.167.91.184	10.167.91.184
58	10.167.91.185/32	10.167.91.185 – 10.167.91.185	10.167.91.185
59	10.167.91.186/32	10.167.91.186 – 10.167.91.186	10.167.91.186
60	10.167.91.187/32	10.167.91.187 – 10.167.91.187	10.167.91.187
61	10.167.91.188/32	10.167.91.188 – 10.167.91.188	10.167.91.188
62	10.167.91.189/32	10.167.91.189 – 10.167.91.189	10.167.91.189
63	10.167.91.190/32	10.167.91.190 – 10.167.91.190	10.167.91.190
64	10.167.91.191/32	10.167.91.191 – 10.167.91.191	10.167.91.191
65	10.167.91.192/32	10.167.91.192 – 10.167.91.192	10.167.91.192
66	10.167.91.193/32	10.167.91.193 – 10.167.91.193	10.167.91.193
67	10.167.91.194/32	10.167.91.194 – 10.167.91.194	10.167.91.194
68	10.167.91.195/32	10.167.91.195 – 10.167.91.195	10.167.91.195
69	10.167.91.196/32	10.167.91.196 – 10.167.91.196	10.167.91.196
70	10.167.91.197/32	10.167.91.197 – 10.167.91.197	10.167.91.197
71	10.167.91.198/32	10.167.91.198 – 10.167.91.198	10.167.91.198
72	10.167.91.199/32	10.167.91.199 – 10.167.91.199	10.167.91.199
73	10.167.91.200/32	10.167.91.200 – 10.167.91.200	10.167.91.200
74	10.167.91.201/32	10.167.91.201 – 10.167.91.201	10.167.91.201
75	10.167.91.202/32	10.167.91.202 – 10.167.91.202	10.167.91.202
76	10.167.91.203/32	10.167.91.203 – 10.167.91.203	10.167.91.203
77	10.167.91.204/32	10.167.91.204 – 10.167.91.204	10.167.91.204
78	10.167.91.205/32	10.167.91.205 – 10.167.91.205	10.167.91.205
79	10.167.91.206/32	10.167.91.206 – 10.167.91.206	10.167.91.206
80	10.167.91.207/32	10.167.91.207 – 10.167.91.207	10.167.91.207
81	10.167.91.208/32	10.167.91.208 – 10.167.91.208	10.167.91.208
82	10.167.91.209/32	10.167.91.209 – 10.167.91.209	10.167.91.209
83	10.167.91.210/32	10.167.91.210 – 10.167.91.210	10.167.91.210
84	10.167.91.211/32	10.167.91.211 – 10.167.91.211	10.167.91.211
85	10.167.91.212/32	10.167.91.212 – 10.167.91.212	10.167.91.212
86	10.167.91.213/32	10.167.91.213 – 10.167.91.213	10.167.91.213
87	10.167.91.214/32	10.167.91.214 – 10.167.91.214	10.167.91.214
88	10.167.91.215/32	10.167.91.215 – 10.167.91.215	10.167.91.215
89	10.167.91.216/32	10.167.91.216 – 10.167.91.216	10.167.91.216
90	10.167.91.217/32	10.167.91.217 – 10.167.91.217	10.167.91.217
91	10.167.91.218/32	10.167.91.218 – 10.167.91.218	10.167.91.218
92	10.167.91.219/32	10.167.91.219 – 10.167.91.219	10.167.91.219
93	10.167.91.220/32	10.167.91.220 – 10.167.91.220	10.167.91.220
94	10.167.91.221/32	10.167.91.221 – 10.167.91.221	10.167.91.221
95	10.167.91.222/32	10.167.91.222 – 10.167.91.222	10.167.91.222
96	10.167.91.223/32	10.167.91.223 – 10.167.91.223	10.167.91.223
97	10.167.91.224/32	10.167.91.224 – 10.167.91.224	10.167.91.224
98	10.167.91.225/32	10.167.91.225 – 10.167.91.225	10.167.91.225
99	10.167.91.226/32	10.167.91.226 – 10.167.91.226	10.167.91.226
100	10.167.91.227/32	10.167.91.227 – 10.167.91.227	10.167.91.227
101	10.167.91.228/32	10.167.91.228 – 10.167.91.228	10.167.91.228
102	10.167.91.229/32	10.167.91.229 – 10.167.91.229	10.167.91.229
103	10.167.91.230/32	10.167.91.230 – 10.167.91.230	10.167.91.230
104	10.167.91.231/32	10.167.91.231 – 10.167.91.231	10.167.91.231
105	10.167.91.232/32	10.167.91.232 – 10.167.91.232	10.167.91.232
106	10.167.91.233/32	10.167.91.233 – 10.167.91.233	10.167.91.233
107	10.167.91.234/32	10.167.91.234 – 10.167.91.234	10.167.91.234
108	10.167.91.235/32	10.167.91.235 – 10.167.91.235	10.167.91.235
109	10.167.91.236/32	10.167.91.236 – 10.167.91.236	10.167.91.236
110	10.167.91.237/32	10.167.91.237 – 10.167.91.237	10.167.91.237
111	10.167.91.238/32	10.167.91.238 – 10.167.91.238	10.167.91.238
112	10.167.91.239/32	10.167.91.239 – 10.167.91.239	10.167.91.239
113	10.167.91.240/32	10.167.91.240 – 10.167.91.240	10.167.91.240
114	10.167.91.241/32	10.167.91.241 – 10.167.91.241	10.167.91.241
115	10.167.91.242/32	10.167.91.242 – 10.167.91.242	10.167.91.242
116	10.167.91.243/32	10.167.91.243 – 10.167.91.243	10.167.91.243
117	10.167.91.244/32	10.167.91.244 – 10.167.91.244	10.167.91.244
118	10.167.91.245/32	10.167.91.245 – 10.167.91.245	10.167.91.245
119	10.167.91.246/32	10.167.91.246 – 10.167.91.246	10.167.91.246
120	10.167.91.247/32	10.167.91.247 – 10.167.91.247	10.167.91.247
121	10.167.91.248/32	10.167.91.248 – 10.167.91.248	10.167.91.248
122	10.167.91.249/32	10.167.91.249 – 10.167.91.249	10.167.91.249
123	10.167.91.250/32	10.167.91.250 – 10.167.91.250	10.167.91.250
124	10.167.91.251/32	10.167.91.251 – 10.167.91.251	10.167.91.251
125	10.167.91.252/32	10.167.91.252 – 10.167.91.252	10.167.91.252
126	10.167.91.253/32	10.167.91.253 – 10.167.91.253	10.167.91.253
127	10.167.91.254/32	10.167.91.254 – 10.167.91.254	10.167.91.254
128	10.167.91.255/32	10.167.91.255 – 10.167.91.255	10.167.91.255

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 →