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)10.167.90.128/25

network10.167.90.128/25

broadcast10.167.90.255

first host10.167.90.129

last host10.167.90.254

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.167.90.128/25

address00001010.10100111.01011010.10000000

subnet mask11111111.11111111.11111111.10000000

network00001010.10100111.01011010.10000000

broadcast00001010.10100111.01011010.11111111

green = network part, grey = host part

hex0x0aa75a80

decimal178739840

reverse dns128.90.167.10.in-addr.arpa

ipv4-mapped::ffff:aa7:5a80

/25 split into /32 · 128 subnets

close ×

#	network	host range	broadcast
1	10.167.90.128/32	10.167.90.128 – 10.167.90.128	10.167.90.128
2	10.167.90.129/32	10.167.90.129 – 10.167.90.129	10.167.90.129
3	10.167.90.130/32	10.167.90.130 – 10.167.90.130	10.167.90.130
4	10.167.90.131/32	10.167.90.131 – 10.167.90.131	10.167.90.131
5	10.167.90.132/32	10.167.90.132 – 10.167.90.132	10.167.90.132
6	10.167.90.133/32	10.167.90.133 – 10.167.90.133	10.167.90.133
7	10.167.90.134/32	10.167.90.134 – 10.167.90.134	10.167.90.134
8	10.167.90.135/32	10.167.90.135 – 10.167.90.135	10.167.90.135
9	10.167.90.136/32	10.167.90.136 – 10.167.90.136	10.167.90.136
10	10.167.90.137/32	10.167.90.137 – 10.167.90.137	10.167.90.137
11	10.167.90.138/32	10.167.90.138 – 10.167.90.138	10.167.90.138
12	10.167.90.139/32	10.167.90.139 – 10.167.90.139	10.167.90.139
13	10.167.90.140/32	10.167.90.140 – 10.167.90.140	10.167.90.140
14	10.167.90.141/32	10.167.90.141 – 10.167.90.141	10.167.90.141
15	10.167.90.142/32	10.167.90.142 – 10.167.90.142	10.167.90.142
16	10.167.90.143/32	10.167.90.143 – 10.167.90.143	10.167.90.143
17	10.167.90.144/32	10.167.90.144 – 10.167.90.144	10.167.90.144
18	10.167.90.145/32	10.167.90.145 – 10.167.90.145	10.167.90.145
19	10.167.90.146/32	10.167.90.146 – 10.167.90.146	10.167.90.146
20	10.167.90.147/32	10.167.90.147 – 10.167.90.147	10.167.90.147
21	10.167.90.148/32	10.167.90.148 – 10.167.90.148	10.167.90.148
22	10.167.90.149/32	10.167.90.149 – 10.167.90.149	10.167.90.149
23	10.167.90.150/32	10.167.90.150 – 10.167.90.150	10.167.90.150
24	10.167.90.151/32	10.167.90.151 – 10.167.90.151	10.167.90.151
25	10.167.90.152/32	10.167.90.152 – 10.167.90.152	10.167.90.152
26	10.167.90.153/32	10.167.90.153 – 10.167.90.153	10.167.90.153
27	10.167.90.154/32	10.167.90.154 – 10.167.90.154	10.167.90.154
28	10.167.90.155/32	10.167.90.155 – 10.167.90.155	10.167.90.155
29	10.167.90.156/32	10.167.90.156 – 10.167.90.156	10.167.90.156
30	10.167.90.157/32	10.167.90.157 – 10.167.90.157	10.167.90.157
31	10.167.90.158/32	10.167.90.158 – 10.167.90.158	10.167.90.158
32	10.167.90.159/32	10.167.90.159 – 10.167.90.159	10.167.90.159
33	10.167.90.160/32	10.167.90.160 – 10.167.90.160	10.167.90.160
34	10.167.90.161/32	10.167.90.161 – 10.167.90.161	10.167.90.161
35	10.167.90.162/32	10.167.90.162 – 10.167.90.162	10.167.90.162
36	10.167.90.163/32	10.167.90.163 – 10.167.90.163	10.167.90.163
37	10.167.90.164/32	10.167.90.164 – 10.167.90.164	10.167.90.164
38	10.167.90.165/32	10.167.90.165 – 10.167.90.165	10.167.90.165
39	10.167.90.166/32	10.167.90.166 – 10.167.90.166	10.167.90.166
40	10.167.90.167/32	10.167.90.167 – 10.167.90.167	10.167.90.167
41	10.167.90.168/32	10.167.90.168 – 10.167.90.168	10.167.90.168
42	10.167.90.169/32	10.167.90.169 – 10.167.90.169	10.167.90.169
43	10.167.90.170/32	10.167.90.170 – 10.167.90.170	10.167.90.170
44	10.167.90.171/32	10.167.90.171 – 10.167.90.171	10.167.90.171
45	10.167.90.172/32	10.167.90.172 – 10.167.90.172	10.167.90.172
46	10.167.90.173/32	10.167.90.173 – 10.167.90.173	10.167.90.173
47	10.167.90.174/32	10.167.90.174 – 10.167.90.174	10.167.90.174
48	10.167.90.175/32	10.167.90.175 – 10.167.90.175	10.167.90.175
49	10.167.90.176/32	10.167.90.176 – 10.167.90.176	10.167.90.176
50	10.167.90.177/32	10.167.90.177 – 10.167.90.177	10.167.90.177
51	10.167.90.178/32	10.167.90.178 – 10.167.90.178	10.167.90.178
52	10.167.90.179/32	10.167.90.179 – 10.167.90.179	10.167.90.179
53	10.167.90.180/32	10.167.90.180 – 10.167.90.180	10.167.90.180
54	10.167.90.181/32	10.167.90.181 – 10.167.90.181	10.167.90.181
55	10.167.90.182/32	10.167.90.182 – 10.167.90.182	10.167.90.182
56	10.167.90.183/32	10.167.90.183 – 10.167.90.183	10.167.90.183
57	10.167.90.184/32	10.167.90.184 – 10.167.90.184	10.167.90.184
58	10.167.90.185/32	10.167.90.185 – 10.167.90.185	10.167.90.185
59	10.167.90.186/32	10.167.90.186 – 10.167.90.186	10.167.90.186
60	10.167.90.187/32	10.167.90.187 – 10.167.90.187	10.167.90.187
61	10.167.90.188/32	10.167.90.188 – 10.167.90.188	10.167.90.188
62	10.167.90.189/32	10.167.90.189 – 10.167.90.189	10.167.90.189
63	10.167.90.190/32	10.167.90.190 – 10.167.90.190	10.167.90.190
64	10.167.90.191/32	10.167.90.191 – 10.167.90.191	10.167.90.191
65	10.167.90.192/32	10.167.90.192 – 10.167.90.192	10.167.90.192
66	10.167.90.193/32	10.167.90.193 – 10.167.90.193	10.167.90.193
67	10.167.90.194/32	10.167.90.194 – 10.167.90.194	10.167.90.194
68	10.167.90.195/32	10.167.90.195 – 10.167.90.195	10.167.90.195
69	10.167.90.196/32	10.167.90.196 – 10.167.90.196	10.167.90.196
70	10.167.90.197/32	10.167.90.197 – 10.167.90.197	10.167.90.197
71	10.167.90.198/32	10.167.90.198 – 10.167.90.198	10.167.90.198
72	10.167.90.199/32	10.167.90.199 – 10.167.90.199	10.167.90.199
73	10.167.90.200/32	10.167.90.200 – 10.167.90.200	10.167.90.200
74	10.167.90.201/32	10.167.90.201 – 10.167.90.201	10.167.90.201
75	10.167.90.202/32	10.167.90.202 – 10.167.90.202	10.167.90.202
76	10.167.90.203/32	10.167.90.203 – 10.167.90.203	10.167.90.203
77	10.167.90.204/32	10.167.90.204 – 10.167.90.204	10.167.90.204
78	10.167.90.205/32	10.167.90.205 – 10.167.90.205	10.167.90.205
79	10.167.90.206/32	10.167.90.206 – 10.167.90.206	10.167.90.206
80	10.167.90.207/32	10.167.90.207 – 10.167.90.207	10.167.90.207
81	10.167.90.208/32	10.167.90.208 – 10.167.90.208	10.167.90.208
82	10.167.90.209/32	10.167.90.209 – 10.167.90.209	10.167.90.209
83	10.167.90.210/32	10.167.90.210 – 10.167.90.210	10.167.90.210
84	10.167.90.211/32	10.167.90.211 – 10.167.90.211	10.167.90.211
85	10.167.90.212/32	10.167.90.212 – 10.167.90.212	10.167.90.212
86	10.167.90.213/32	10.167.90.213 – 10.167.90.213	10.167.90.213
87	10.167.90.214/32	10.167.90.214 – 10.167.90.214	10.167.90.214
88	10.167.90.215/32	10.167.90.215 – 10.167.90.215	10.167.90.215
89	10.167.90.216/32	10.167.90.216 – 10.167.90.216	10.167.90.216
90	10.167.90.217/32	10.167.90.217 – 10.167.90.217	10.167.90.217
91	10.167.90.218/32	10.167.90.218 – 10.167.90.218	10.167.90.218
92	10.167.90.219/32	10.167.90.219 – 10.167.90.219	10.167.90.219
93	10.167.90.220/32	10.167.90.220 – 10.167.90.220	10.167.90.220
94	10.167.90.221/32	10.167.90.221 – 10.167.90.221	10.167.90.221
95	10.167.90.222/32	10.167.90.222 – 10.167.90.222	10.167.90.222
96	10.167.90.223/32	10.167.90.223 – 10.167.90.223	10.167.90.223
97	10.167.90.224/32	10.167.90.224 – 10.167.90.224	10.167.90.224
98	10.167.90.225/32	10.167.90.225 – 10.167.90.225	10.167.90.225
99	10.167.90.226/32	10.167.90.226 – 10.167.90.226	10.167.90.226
100	10.167.90.227/32	10.167.90.227 – 10.167.90.227	10.167.90.227
101	10.167.90.228/32	10.167.90.228 – 10.167.90.228	10.167.90.228
102	10.167.90.229/32	10.167.90.229 – 10.167.90.229	10.167.90.229
103	10.167.90.230/32	10.167.90.230 – 10.167.90.230	10.167.90.230
104	10.167.90.231/32	10.167.90.231 – 10.167.90.231	10.167.90.231
105	10.167.90.232/32	10.167.90.232 – 10.167.90.232	10.167.90.232
106	10.167.90.233/32	10.167.90.233 – 10.167.90.233	10.167.90.233
107	10.167.90.234/32	10.167.90.234 – 10.167.90.234	10.167.90.234
108	10.167.90.235/32	10.167.90.235 – 10.167.90.235	10.167.90.235
109	10.167.90.236/32	10.167.90.236 – 10.167.90.236	10.167.90.236
110	10.167.90.237/32	10.167.90.237 – 10.167.90.237	10.167.90.237
111	10.167.90.238/32	10.167.90.238 – 10.167.90.238	10.167.90.238
112	10.167.90.239/32	10.167.90.239 – 10.167.90.239	10.167.90.239
113	10.167.90.240/32	10.167.90.240 – 10.167.90.240	10.167.90.240
114	10.167.90.241/32	10.167.90.241 – 10.167.90.241	10.167.90.241
115	10.167.90.242/32	10.167.90.242 – 10.167.90.242	10.167.90.242
116	10.167.90.243/32	10.167.90.243 – 10.167.90.243	10.167.90.243
117	10.167.90.244/32	10.167.90.244 – 10.167.90.244	10.167.90.244
118	10.167.90.245/32	10.167.90.245 – 10.167.90.245	10.167.90.245
119	10.167.90.246/32	10.167.90.246 – 10.167.90.246	10.167.90.246
120	10.167.90.247/32	10.167.90.247 – 10.167.90.247	10.167.90.247
121	10.167.90.248/32	10.167.90.248 – 10.167.90.248	10.167.90.248
122	10.167.90.249/32	10.167.90.249 – 10.167.90.249	10.167.90.249
123	10.167.90.250/32	10.167.90.250 – 10.167.90.250	10.167.90.250
124	10.167.90.251/32	10.167.90.251 – 10.167.90.251	10.167.90.251
125	10.167.90.252/32	10.167.90.252 – 10.167.90.252	10.167.90.252
126	10.167.90.253/32	10.167.90.253 – 10.167.90.253	10.167.90.253
127	10.167.90.254/32	10.167.90.254 – 10.167.90.254	10.167.90.254
128	10.167.90.255/32	10.167.90.255 – 10.167.90.255	10.167.90.255

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 →