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)10.167.158.128/25

network10.167.158.128/25

broadcast10.167.158.255

first host10.167.158.129

last host10.167.158.254

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.167.158.128/25

address00001010.10100111.10011110.10000000

subnet mask11111111.11111111.11111111.10000000

network00001010.10100111.10011110.10000000

broadcast00001010.10100111.10011110.11111111

green = network part, grey = host part

hex0x0aa79e80

decimal178757248

reverse dns128.158.167.10.in-addr.arpa

ipv4-mapped::ffff:aa7:9e80

/25 split into /32 · 128 subnets

close ×

#	network	host range	broadcast
1	10.167.158.128/32	10.167.158.128 – 10.167.158.128	10.167.158.128
2	10.167.158.129/32	10.167.158.129 – 10.167.158.129	10.167.158.129
3	10.167.158.130/32	10.167.158.130 – 10.167.158.130	10.167.158.130
4	10.167.158.131/32	10.167.158.131 – 10.167.158.131	10.167.158.131
5	10.167.158.132/32	10.167.158.132 – 10.167.158.132	10.167.158.132
6	10.167.158.133/32	10.167.158.133 – 10.167.158.133	10.167.158.133
7	10.167.158.134/32	10.167.158.134 – 10.167.158.134	10.167.158.134
8	10.167.158.135/32	10.167.158.135 – 10.167.158.135	10.167.158.135
9	10.167.158.136/32	10.167.158.136 – 10.167.158.136	10.167.158.136
10	10.167.158.137/32	10.167.158.137 – 10.167.158.137	10.167.158.137
11	10.167.158.138/32	10.167.158.138 – 10.167.158.138	10.167.158.138
12	10.167.158.139/32	10.167.158.139 – 10.167.158.139	10.167.158.139
13	10.167.158.140/32	10.167.158.140 – 10.167.158.140	10.167.158.140
14	10.167.158.141/32	10.167.158.141 – 10.167.158.141	10.167.158.141
15	10.167.158.142/32	10.167.158.142 – 10.167.158.142	10.167.158.142
16	10.167.158.143/32	10.167.158.143 – 10.167.158.143	10.167.158.143
17	10.167.158.144/32	10.167.158.144 – 10.167.158.144	10.167.158.144
18	10.167.158.145/32	10.167.158.145 – 10.167.158.145	10.167.158.145
19	10.167.158.146/32	10.167.158.146 – 10.167.158.146	10.167.158.146
20	10.167.158.147/32	10.167.158.147 – 10.167.158.147	10.167.158.147
21	10.167.158.148/32	10.167.158.148 – 10.167.158.148	10.167.158.148
22	10.167.158.149/32	10.167.158.149 – 10.167.158.149	10.167.158.149
23	10.167.158.150/32	10.167.158.150 – 10.167.158.150	10.167.158.150
24	10.167.158.151/32	10.167.158.151 – 10.167.158.151	10.167.158.151
25	10.167.158.152/32	10.167.158.152 – 10.167.158.152	10.167.158.152
26	10.167.158.153/32	10.167.158.153 – 10.167.158.153	10.167.158.153
27	10.167.158.154/32	10.167.158.154 – 10.167.158.154	10.167.158.154
28	10.167.158.155/32	10.167.158.155 – 10.167.158.155	10.167.158.155
29	10.167.158.156/32	10.167.158.156 – 10.167.158.156	10.167.158.156
30	10.167.158.157/32	10.167.158.157 – 10.167.158.157	10.167.158.157
31	10.167.158.158/32	10.167.158.158 – 10.167.158.158	10.167.158.158
32	10.167.158.159/32	10.167.158.159 – 10.167.158.159	10.167.158.159
33	10.167.158.160/32	10.167.158.160 – 10.167.158.160	10.167.158.160
34	10.167.158.161/32	10.167.158.161 – 10.167.158.161	10.167.158.161
35	10.167.158.162/32	10.167.158.162 – 10.167.158.162	10.167.158.162
36	10.167.158.163/32	10.167.158.163 – 10.167.158.163	10.167.158.163
37	10.167.158.164/32	10.167.158.164 – 10.167.158.164	10.167.158.164
38	10.167.158.165/32	10.167.158.165 – 10.167.158.165	10.167.158.165
39	10.167.158.166/32	10.167.158.166 – 10.167.158.166	10.167.158.166
40	10.167.158.167/32	10.167.158.167 – 10.167.158.167	10.167.158.167
41	10.167.158.168/32	10.167.158.168 – 10.167.158.168	10.167.158.168
42	10.167.158.169/32	10.167.158.169 – 10.167.158.169	10.167.158.169
43	10.167.158.170/32	10.167.158.170 – 10.167.158.170	10.167.158.170
44	10.167.158.171/32	10.167.158.171 – 10.167.158.171	10.167.158.171
45	10.167.158.172/32	10.167.158.172 – 10.167.158.172	10.167.158.172
46	10.167.158.173/32	10.167.158.173 – 10.167.158.173	10.167.158.173
47	10.167.158.174/32	10.167.158.174 – 10.167.158.174	10.167.158.174
48	10.167.158.175/32	10.167.158.175 – 10.167.158.175	10.167.158.175
49	10.167.158.176/32	10.167.158.176 – 10.167.158.176	10.167.158.176
50	10.167.158.177/32	10.167.158.177 – 10.167.158.177	10.167.158.177
51	10.167.158.178/32	10.167.158.178 – 10.167.158.178	10.167.158.178
52	10.167.158.179/32	10.167.158.179 – 10.167.158.179	10.167.158.179
53	10.167.158.180/32	10.167.158.180 – 10.167.158.180	10.167.158.180
54	10.167.158.181/32	10.167.158.181 – 10.167.158.181	10.167.158.181
55	10.167.158.182/32	10.167.158.182 – 10.167.158.182	10.167.158.182
56	10.167.158.183/32	10.167.158.183 – 10.167.158.183	10.167.158.183
57	10.167.158.184/32	10.167.158.184 – 10.167.158.184	10.167.158.184
58	10.167.158.185/32	10.167.158.185 – 10.167.158.185	10.167.158.185
59	10.167.158.186/32	10.167.158.186 – 10.167.158.186	10.167.158.186
60	10.167.158.187/32	10.167.158.187 – 10.167.158.187	10.167.158.187
61	10.167.158.188/32	10.167.158.188 – 10.167.158.188	10.167.158.188
62	10.167.158.189/32	10.167.158.189 – 10.167.158.189	10.167.158.189
63	10.167.158.190/32	10.167.158.190 – 10.167.158.190	10.167.158.190
64	10.167.158.191/32	10.167.158.191 – 10.167.158.191	10.167.158.191
65	10.167.158.192/32	10.167.158.192 – 10.167.158.192	10.167.158.192
66	10.167.158.193/32	10.167.158.193 – 10.167.158.193	10.167.158.193
67	10.167.158.194/32	10.167.158.194 – 10.167.158.194	10.167.158.194
68	10.167.158.195/32	10.167.158.195 – 10.167.158.195	10.167.158.195
69	10.167.158.196/32	10.167.158.196 – 10.167.158.196	10.167.158.196
70	10.167.158.197/32	10.167.158.197 – 10.167.158.197	10.167.158.197
71	10.167.158.198/32	10.167.158.198 – 10.167.158.198	10.167.158.198
72	10.167.158.199/32	10.167.158.199 – 10.167.158.199	10.167.158.199
73	10.167.158.200/32	10.167.158.200 – 10.167.158.200	10.167.158.200
74	10.167.158.201/32	10.167.158.201 – 10.167.158.201	10.167.158.201
75	10.167.158.202/32	10.167.158.202 – 10.167.158.202	10.167.158.202
76	10.167.158.203/32	10.167.158.203 – 10.167.158.203	10.167.158.203
77	10.167.158.204/32	10.167.158.204 – 10.167.158.204	10.167.158.204
78	10.167.158.205/32	10.167.158.205 – 10.167.158.205	10.167.158.205
79	10.167.158.206/32	10.167.158.206 – 10.167.158.206	10.167.158.206
80	10.167.158.207/32	10.167.158.207 – 10.167.158.207	10.167.158.207
81	10.167.158.208/32	10.167.158.208 – 10.167.158.208	10.167.158.208
82	10.167.158.209/32	10.167.158.209 – 10.167.158.209	10.167.158.209
83	10.167.158.210/32	10.167.158.210 – 10.167.158.210	10.167.158.210
84	10.167.158.211/32	10.167.158.211 – 10.167.158.211	10.167.158.211
85	10.167.158.212/32	10.167.158.212 – 10.167.158.212	10.167.158.212
86	10.167.158.213/32	10.167.158.213 – 10.167.158.213	10.167.158.213
87	10.167.158.214/32	10.167.158.214 – 10.167.158.214	10.167.158.214
88	10.167.158.215/32	10.167.158.215 – 10.167.158.215	10.167.158.215
89	10.167.158.216/32	10.167.158.216 – 10.167.158.216	10.167.158.216
90	10.167.158.217/32	10.167.158.217 – 10.167.158.217	10.167.158.217
91	10.167.158.218/32	10.167.158.218 – 10.167.158.218	10.167.158.218
92	10.167.158.219/32	10.167.158.219 – 10.167.158.219	10.167.158.219
93	10.167.158.220/32	10.167.158.220 – 10.167.158.220	10.167.158.220
94	10.167.158.221/32	10.167.158.221 – 10.167.158.221	10.167.158.221
95	10.167.158.222/32	10.167.158.222 – 10.167.158.222	10.167.158.222
96	10.167.158.223/32	10.167.158.223 – 10.167.158.223	10.167.158.223
97	10.167.158.224/32	10.167.158.224 – 10.167.158.224	10.167.158.224
98	10.167.158.225/32	10.167.158.225 – 10.167.158.225	10.167.158.225
99	10.167.158.226/32	10.167.158.226 – 10.167.158.226	10.167.158.226
100	10.167.158.227/32	10.167.158.227 – 10.167.158.227	10.167.158.227
101	10.167.158.228/32	10.167.158.228 – 10.167.158.228	10.167.158.228
102	10.167.158.229/32	10.167.158.229 – 10.167.158.229	10.167.158.229
103	10.167.158.230/32	10.167.158.230 – 10.167.158.230	10.167.158.230
104	10.167.158.231/32	10.167.158.231 – 10.167.158.231	10.167.158.231
105	10.167.158.232/32	10.167.158.232 – 10.167.158.232	10.167.158.232
106	10.167.158.233/32	10.167.158.233 – 10.167.158.233	10.167.158.233
107	10.167.158.234/32	10.167.158.234 – 10.167.158.234	10.167.158.234
108	10.167.158.235/32	10.167.158.235 – 10.167.158.235	10.167.158.235
109	10.167.158.236/32	10.167.158.236 – 10.167.158.236	10.167.158.236
110	10.167.158.237/32	10.167.158.237 – 10.167.158.237	10.167.158.237
111	10.167.158.238/32	10.167.158.238 – 10.167.158.238	10.167.158.238
112	10.167.158.239/32	10.167.158.239 – 10.167.158.239	10.167.158.239
113	10.167.158.240/32	10.167.158.240 – 10.167.158.240	10.167.158.240
114	10.167.158.241/32	10.167.158.241 – 10.167.158.241	10.167.158.241
115	10.167.158.242/32	10.167.158.242 – 10.167.158.242	10.167.158.242
116	10.167.158.243/32	10.167.158.243 – 10.167.158.243	10.167.158.243
117	10.167.158.244/32	10.167.158.244 – 10.167.158.244	10.167.158.244
118	10.167.158.245/32	10.167.158.245 – 10.167.158.245	10.167.158.245
119	10.167.158.246/32	10.167.158.246 – 10.167.158.246	10.167.158.246
120	10.167.158.247/32	10.167.158.247 – 10.167.158.247	10.167.158.247
121	10.167.158.248/32	10.167.158.248 – 10.167.158.248	10.167.158.248
122	10.167.158.249/32	10.167.158.249 – 10.167.158.249	10.167.158.249
123	10.167.158.250/32	10.167.158.250 – 10.167.158.250	10.167.158.250
124	10.167.158.251/32	10.167.158.251 – 10.167.158.251	10.167.158.251
125	10.167.158.252/32	10.167.158.252 – 10.167.158.252	10.167.158.252
126	10.167.158.253/32	10.167.158.253 – 10.167.158.253	10.167.158.253
127	10.167.158.254/32	10.167.158.254 – 10.167.158.254	10.167.158.254
128	10.167.158.255/32	10.167.158.255 – 10.167.158.255	10.167.158.255

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 →