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)10.167.190.128/25

network10.167.190.128/25

broadcast10.167.190.255

first host10.167.190.129

last host10.167.190.254

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.167.190.128/25

address00001010.10100111.10111110.10000000

subnet mask11111111.11111111.11111111.10000000

network00001010.10100111.10111110.10000000

broadcast00001010.10100111.10111110.11111111

green = network part, grey = host part

hex0x0aa7be80

decimal178765440

reverse dns128.190.167.10.in-addr.arpa

ipv4-mapped::ffff:aa7:be80

/25 split into /32 · 128 subnets

close ×

#	network	host range	broadcast
1	10.167.190.128/32	10.167.190.128 – 10.167.190.128	10.167.190.128
2	10.167.190.129/32	10.167.190.129 – 10.167.190.129	10.167.190.129
3	10.167.190.130/32	10.167.190.130 – 10.167.190.130	10.167.190.130
4	10.167.190.131/32	10.167.190.131 – 10.167.190.131	10.167.190.131
5	10.167.190.132/32	10.167.190.132 – 10.167.190.132	10.167.190.132
6	10.167.190.133/32	10.167.190.133 – 10.167.190.133	10.167.190.133
7	10.167.190.134/32	10.167.190.134 – 10.167.190.134	10.167.190.134
8	10.167.190.135/32	10.167.190.135 – 10.167.190.135	10.167.190.135
9	10.167.190.136/32	10.167.190.136 – 10.167.190.136	10.167.190.136
10	10.167.190.137/32	10.167.190.137 – 10.167.190.137	10.167.190.137
11	10.167.190.138/32	10.167.190.138 – 10.167.190.138	10.167.190.138
12	10.167.190.139/32	10.167.190.139 – 10.167.190.139	10.167.190.139
13	10.167.190.140/32	10.167.190.140 – 10.167.190.140	10.167.190.140
14	10.167.190.141/32	10.167.190.141 – 10.167.190.141	10.167.190.141
15	10.167.190.142/32	10.167.190.142 – 10.167.190.142	10.167.190.142
16	10.167.190.143/32	10.167.190.143 – 10.167.190.143	10.167.190.143
17	10.167.190.144/32	10.167.190.144 – 10.167.190.144	10.167.190.144
18	10.167.190.145/32	10.167.190.145 – 10.167.190.145	10.167.190.145
19	10.167.190.146/32	10.167.190.146 – 10.167.190.146	10.167.190.146
20	10.167.190.147/32	10.167.190.147 – 10.167.190.147	10.167.190.147
21	10.167.190.148/32	10.167.190.148 – 10.167.190.148	10.167.190.148
22	10.167.190.149/32	10.167.190.149 – 10.167.190.149	10.167.190.149
23	10.167.190.150/32	10.167.190.150 – 10.167.190.150	10.167.190.150
24	10.167.190.151/32	10.167.190.151 – 10.167.190.151	10.167.190.151
25	10.167.190.152/32	10.167.190.152 – 10.167.190.152	10.167.190.152
26	10.167.190.153/32	10.167.190.153 – 10.167.190.153	10.167.190.153
27	10.167.190.154/32	10.167.190.154 – 10.167.190.154	10.167.190.154
28	10.167.190.155/32	10.167.190.155 – 10.167.190.155	10.167.190.155
29	10.167.190.156/32	10.167.190.156 – 10.167.190.156	10.167.190.156
30	10.167.190.157/32	10.167.190.157 – 10.167.190.157	10.167.190.157
31	10.167.190.158/32	10.167.190.158 – 10.167.190.158	10.167.190.158
32	10.167.190.159/32	10.167.190.159 – 10.167.190.159	10.167.190.159
33	10.167.190.160/32	10.167.190.160 – 10.167.190.160	10.167.190.160
34	10.167.190.161/32	10.167.190.161 – 10.167.190.161	10.167.190.161
35	10.167.190.162/32	10.167.190.162 – 10.167.190.162	10.167.190.162
36	10.167.190.163/32	10.167.190.163 – 10.167.190.163	10.167.190.163
37	10.167.190.164/32	10.167.190.164 – 10.167.190.164	10.167.190.164
38	10.167.190.165/32	10.167.190.165 – 10.167.190.165	10.167.190.165
39	10.167.190.166/32	10.167.190.166 – 10.167.190.166	10.167.190.166
40	10.167.190.167/32	10.167.190.167 – 10.167.190.167	10.167.190.167
41	10.167.190.168/32	10.167.190.168 – 10.167.190.168	10.167.190.168
42	10.167.190.169/32	10.167.190.169 – 10.167.190.169	10.167.190.169
43	10.167.190.170/32	10.167.190.170 – 10.167.190.170	10.167.190.170
44	10.167.190.171/32	10.167.190.171 – 10.167.190.171	10.167.190.171
45	10.167.190.172/32	10.167.190.172 – 10.167.190.172	10.167.190.172
46	10.167.190.173/32	10.167.190.173 – 10.167.190.173	10.167.190.173
47	10.167.190.174/32	10.167.190.174 – 10.167.190.174	10.167.190.174
48	10.167.190.175/32	10.167.190.175 – 10.167.190.175	10.167.190.175
49	10.167.190.176/32	10.167.190.176 – 10.167.190.176	10.167.190.176
50	10.167.190.177/32	10.167.190.177 – 10.167.190.177	10.167.190.177
51	10.167.190.178/32	10.167.190.178 – 10.167.190.178	10.167.190.178
52	10.167.190.179/32	10.167.190.179 – 10.167.190.179	10.167.190.179
53	10.167.190.180/32	10.167.190.180 – 10.167.190.180	10.167.190.180
54	10.167.190.181/32	10.167.190.181 – 10.167.190.181	10.167.190.181
55	10.167.190.182/32	10.167.190.182 – 10.167.190.182	10.167.190.182
56	10.167.190.183/32	10.167.190.183 – 10.167.190.183	10.167.190.183
57	10.167.190.184/32	10.167.190.184 – 10.167.190.184	10.167.190.184
58	10.167.190.185/32	10.167.190.185 – 10.167.190.185	10.167.190.185
59	10.167.190.186/32	10.167.190.186 – 10.167.190.186	10.167.190.186
60	10.167.190.187/32	10.167.190.187 – 10.167.190.187	10.167.190.187
61	10.167.190.188/32	10.167.190.188 – 10.167.190.188	10.167.190.188
62	10.167.190.189/32	10.167.190.189 – 10.167.190.189	10.167.190.189
63	10.167.190.190/32	10.167.190.190 – 10.167.190.190	10.167.190.190
64	10.167.190.191/32	10.167.190.191 – 10.167.190.191	10.167.190.191
65	10.167.190.192/32	10.167.190.192 – 10.167.190.192	10.167.190.192
66	10.167.190.193/32	10.167.190.193 – 10.167.190.193	10.167.190.193
67	10.167.190.194/32	10.167.190.194 – 10.167.190.194	10.167.190.194
68	10.167.190.195/32	10.167.190.195 – 10.167.190.195	10.167.190.195
69	10.167.190.196/32	10.167.190.196 – 10.167.190.196	10.167.190.196
70	10.167.190.197/32	10.167.190.197 – 10.167.190.197	10.167.190.197
71	10.167.190.198/32	10.167.190.198 – 10.167.190.198	10.167.190.198
72	10.167.190.199/32	10.167.190.199 – 10.167.190.199	10.167.190.199
73	10.167.190.200/32	10.167.190.200 – 10.167.190.200	10.167.190.200
74	10.167.190.201/32	10.167.190.201 – 10.167.190.201	10.167.190.201
75	10.167.190.202/32	10.167.190.202 – 10.167.190.202	10.167.190.202
76	10.167.190.203/32	10.167.190.203 – 10.167.190.203	10.167.190.203
77	10.167.190.204/32	10.167.190.204 – 10.167.190.204	10.167.190.204
78	10.167.190.205/32	10.167.190.205 – 10.167.190.205	10.167.190.205
79	10.167.190.206/32	10.167.190.206 – 10.167.190.206	10.167.190.206
80	10.167.190.207/32	10.167.190.207 – 10.167.190.207	10.167.190.207
81	10.167.190.208/32	10.167.190.208 – 10.167.190.208	10.167.190.208
82	10.167.190.209/32	10.167.190.209 – 10.167.190.209	10.167.190.209
83	10.167.190.210/32	10.167.190.210 – 10.167.190.210	10.167.190.210
84	10.167.190.211/32	10.167.190.211 – 10.167.190.211	10.167.190.211
85	10.167.190.212/32	10.167.190.212 – 10.167.190.212	10.167.190.212
86	10.167.190.213/32	10.167.190.213 – 10.167.190.213	10.167.190.213
87	10.167.190.214/32	10.167.190.214 – 10.167.190.214	10.167.190.214
88	10.167.190.215/32	10.167.190.215 – 10.167.190.215	10.167.190.215
89	10.167.190.216/32	10.167.190.216 – 10.167.190.216	10.167.190.216
90	10.167.190.217/32	10.167.190.217 – 10.167.190.217	10.167.190.217
91	10.167.190.218/32	10.167.190.218 – 10.167.190.218	10.167.190.218
92	10.167.190.219/32	10.167.190.219 – 10.167.190.219	10.167.190.219
93	10.167.190.220/32	10.167.190.220 – 10.167.190.220	10.167.190.220
94	10.167.190.221/32	10.167.190.221 – 10.167.190.221	10.167.190.221
95	10.167.190.222/32	10.167.190.222 – 10.167.190.222	10.167.190.222
96	10.167.190.223/32	10.167.190.223 – 10.167.190.223	10.167.190.223
97	10.167.190.224/32	10.167.190.224 – 10.167.190.224	10.167.190.224
98	10.167.190.225/32	10.167.190.225 – 10.167.190.225	10.167.190.225
99	10.167.190.226/32	10.167.190.226 – 10.167.190.226	10.167.190.226
100	10.167.190.227/32	10.167.190.227 – 10.167.190.227	10.167.190.227
101	10.167.190.228/32	10.167.190.228 – 10.167.190.228	10.167.190.228
102	10.167.190.229/32	10.167.190.229 – 10.167.190.229	10.167.190.229
103	10.167.190.230/32	10.167.190.230 – 10.167.190.230	10.167.190.230
104	10.167.190.231/32	10.167.190.231 – 10.167.190.231	10.167.190.231
105	10.167.190.232/32	10.167.190.232 – 10.167.190.232	10.167.190.232
106	10.167.190.233/32	10.167.190.233 – 10.167.190.233	10.167.190.233
107	10.167.190.234/32	10.167.190.234 – 10.167.190.234	10.167.190.234
108	10.167.190.235/32	10.167.190.235 – 10.167.190.235	10.167.190.235
109	10.167.190.236/32	10.167.190.236 – 10.167.190.236	10.167.190.236
110	10.167.190.237/32	10.167.190.237 – 10.167.190.237	10.167.190.237
111	10.167.190.238/32	10.167.190.238 – 10.167.190.238	10.167.190.238
112	10.167.190.239/32	10.167.190.239 – 10.167.190.239	10.167.190.239
113	10.167.190.240/32	10.167.190.240 – 10.167.190.240	10.167.190.240
114	10.167.190.241/32	10.167.190.241 – 10.167.190.241	10.167.190.241
115	10.167.190.242/32	10.167.190.242 – 10.167.190.242	10.167.190.242
116	10.167.190.243/32	10.167.190.243 – 10.167.190.243	10.167.190.243
117	10.167.190.244/32	10.167.190.244 – 10.167.190.244	10.167.190.244
118	10.167.190.245/32	10.167.190.245 – 10.167.190.245	10.167.190.245
119	10.167.190.246/32	10.167.190.246 – 10.167.190.246	10.167.190.246
120	10.167.190.247/32	10.167.190.247 – 10.167.190.247	10.167.190.247
121	10.167.190.248/32	10.167.190.248 – 10.167.190.248	10.167.190.248
122	10.167.190.249/32	10.167.190.249 – 10.167.190.249	10.167.190.249
123	10.167.190.250/32	10.167.190.250 – 10.167.190.250	10.167.190.250
124	10.167.190.251/32	10.167.190.251 – 10.167.190.251	10.167.190.251
125	10.167.190.252/32	10.167.190.252 – 10.167.190.252	10.167.190.252
126	10.167.190.253/32	10.167.190.253 – 10.167.190.253	10.167.190.253
127	10.167.190.254/32	10.167.190.254 – 10.167.190.254	10.167.190.254
128	10.167.190.255/32	10.167.190.255 – 10.167.190.255	10.167.190.255

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 →