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)10.167.142.128/25

network10.167.142.128/25

broadcast10.167.142.255

first host10.167.142.129

last host10.167.142.254

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.167.142.128/25

address00001010.10100111.10001110.10000000

subnet mask11111111.11111111.11111111.10000000

network00001010.10100111.10001110.10000000

broadcast00001010.10100111.10001110.11111111

green = network part, grey = host part

hex0x0aa78e80

decimal178753152

reverse dns128.142.167.10.in-addr.arpa

ipv4-mapped::ffff:aa7:8e80

/25 split into /32 · 128 subnets

close ×

#	network	host range	broadcast
1	10.167.142.128/32	10.167.142.128 – 10.167.142.128	10.167.142.128
2	10.167.142.129/32	10.167.142.129 – 10.167.142.129	10.167.142.129
3	10.167.142.130/32	10.167.142.130 – 10.167.142.130	10.167.142.130
4	10.167.142.131/32	10.167.142.131 – 10.167.142.131	10.167.142.131
5	10.167.142.132/32	10.167.142.132 – 10.167.142.132	10.167.142.132
6	10.167.142.133/32	10.167.142.133 – 10.167.142.133	10.167.142.133
7	10.167.142.134/32	10.167.142.134 – 10.167.142.134	10.167.142.134
8	10.167.142.135/32	10.167.142.135 – 10.167.142.135	10.167.142.135
9	10.167.142.136/32	10.167.142.136 – 10.167.142.136	10.167.142.136
10	10.167.142.137/32	10.167.142.137 – 10.167.142.137	10.167.142.137
11	10.167.142.138/32	10.167.142.138 – 10.167.142.138	10.167.142.138
12	10.167.142.139/32	10.167.142.139 – 10.167.142.139	10.167.142.139
13	10.167.142.140/32	10.167.142.140 – 10.167.142.140	10.167.142.140
14	10.167.142.141/32	10.167.142.141 – 10.167.142.141	10.167.142.141
15	10.167.142.142/32	10.167.142.142 – 10.167.142.142	10.167.142.142
16	10.167.142.143/32	10.167.142.143 – 10.167.142.143	10.167.142.143
17	10.167.142.144/32	10.167.142.144 – 10.167.142.144	10.167.142.144
18	10.167.142.145/32	10.167.142.145 – 10.167.142.145	10.167.142.145
19	10.167.142.146/32	10.167.142.146 – 10.167.142.146	10.167.142.146
20	10.167.142.147/32	10.167.142.147 – 10.167.142.147	10.167.142.147
21	10.167.142.148/32	10.167.142.148 – 10.167.142.148	10.167.142.148
22	10.167.142.149/32	10.167.142.149 – 10.167.142.149	10.167.142.149
23	10.167.142.150/32	10.167.142.150 – 10.167.142.150	10.167.142.150
24	10.167.142.151/32	10.167.142.151 – 10.167.142.151	10.167.142.151
25	10.167.142.152/32	10.167.142.152 – 10.167.142.152	10.167.142.152
26	10.167.142.153/32	10.167.142.153 – 10.167.142.153	10.167.142.153
27	10.167.142.154/32	10.167.142.154 – 10.167.142.154	10.167.142.154
28	10.167.142.155/32	10.167.142.155 – 10.167.142.155	10.167.142.155
29	10.167.142.156/32	10.167.142.156 – 10.167.142.156	10.167.142.156
30	10.167.142.157/32	10.167.142.157 – 10.167.142.157	10.167.142.157
31	10.167.142.158/32	10.167.142.158 – 10.167.142.158	10.167.142.158
32	10.167.142.159/32	10.167.142.159 – 10.167.142.159	10.167.142.159
33	10.167.142.160/32	10.167.142.160 – 10.167.142.160	10.167.142.160
34	10.167.142.161/32	10.167.142.161 – 10.167.142.161	10.167.142.161
35	10.167.142.162/32	10.167.142.162 – 10.167.142.162	10.167.142.162
36	10.167.142.163/32	10.167.142.163 – 10.167.142.163	10.167.142.163
37	10.167.142.164/32	10.167.142.164 – 10.167.142.164	10.167.142.164
38	10.167.142.165/32	10.167.142.165 – 10.167.142.165	10.167.142.165
39	10.167.142.166/32	10.167.142.166 – 10.167.142.166	10.167.142.166
40	10.167.142.167/32	10.167.142.167 – 10.167.142.167	10.167.142.167
41	10.167.142.168/32	10.167.142.168 – 10.167.142.168	10.167.142.168
42	10.167.142.169/32	10.167.142.169 – 10.167.142.169	10.167.142.169
43	10.167.142.170/32	10.167.142.170 – 10.167.142.170	10.167.142.170
44	10.167.142.171/32	10.167.142.171 – 10.167.142.171	10.167.142.171
45	10.167.142.172/32	10.167.142.172 – 10.167.142.172	10.167.142.172
46	10.167.142.173/32	10.167.142.173 – 10.167.142.173	10.167.142.173
47	10.167.142.174/32	10.167.142.174 – 10.167.142.174	10.167.142.174
48	10.167.142.175/32	10.167.142.175 – 10.167.142.175	10.167.142.175
49	10.167.142.176/32	10.167.142.176 – 10.167.142.176	10.167.142.176
50	10.167.142.177/32	10.167.142.177 – 10.167.142.177	10.167.142.177
51	10.167.142.178/32	10.167.142.178 – 10.167.142.178	10.167.142.178
52	10.167.142.179/32	10.167.142.179 – 10.167.142.179	10.167.142.179
53	10.167.142.180/32	10.167.142.180 – 10.167.142.180	10.167.142.180
54	10.167.142.181/32	10.167.142.181 – 10.167.142.181	10.167.142.181
55	10.167.142.182/32	10.167.142.182 – 10.167.142.182	10.167.142.182
56	10.167.142.183/32	10.167.142.183 – 10.167.142.183	10.167.142.183
57	10.167.142.184/32	10.167.142.184 – 10.167.142.184	10.167.142.184
58	10.167.142.185/32	10.167.142.185 – 10.167.142.185	10.167.142.185
59	10.167.142.186/32	10.167.142.186 – 10.167.142.186	10.167.142.186
60	10.167.142.187/32	10.167.142.187 – 10.167.142.187	10.167.142.187
61	10.167.142.188/32	10.167.142.188 – 10.167.142.188	10.167.142.188
62	10.167.142.189/32	10.167.142.189 – 10.167.142.189	10.167.142.189
63	10.167.142.190/32	10.167.142.190 – 10.167.142.190	10.167.142.190
64	10.167.142.191/32	10.167.142.191 – 10.167.142.191	10.167.142.191
65	10.167.142.192/32	10.167.142.192 – 10.167.142.192	10.167.142.192
66	10.167.142.193/32	10.167.142.193 – 10.167.142.193	10.167.142.193
67	10.167.142.194/32	10.167.142.194 – 10.167.142.194	10.167.142.194
68	10.167.142.195/32	10.167.142.195 – 10.167.142.195	10.167.142.195
69	10.167.142.196/32	10.167.142.196 – 10.167.142.196	10.167.142.196
70	10.167.142.197/32	10.167.142.197 – 10.167.142.197	10.167.142.197
71	10.167.142.198/32	10.167.142.198 – 10.167.142.198	10.167.142.198
72	10.167.142.199/32	10.167.142.199 – 10.167.142.199	10.167.142.199
73	10.167.142.200/32	10.167.142.200 – 10.167.142.200	10.167.142.200
74	10.167.142.201/32	10.167.142.201 – 10.167.142.201	10.167.142.201
75	10.167.142.202/32	10.167.142.202 – 10.167.142.202	10.167.142.202
76	10.167.142.203/32	10.167.142.203 – 10.167.142.203	10.167.142.203
77	10.167.142.204/32	10.167.142.204 – 10.167.142.204	10.167.142.204
78	10.167.142.205/32	10.167.142.205 – 10.167.142.205	10.167.142.205
79	10.167.142.206/32	10.167.142.206 – 10.167.142.206	10.167.142.206
80	10.167.142.207/32	10.167.142.207 – 10.167.142.207	10.167.142.207
81	10.167.142.208/32	10.167.142.208 – 10.167.142.208	10.167.142.208
82	10.167.142.209/32	10.167.142.209 – 10.167.142.209	10.167.142.209
83	10.167.142.210/32	10.167.142.210 – 10.167.142.210	10.167.142.210
84	10.167.142.211/32	10.167.142.211 – 10.167.142.211	10.167.142.211
85	10.167.142.212/32	10.167.142.212 – 10.167.142.212	10.167.142.212
86	10.167.142.213/32	10.167.142.213 – 10.167.142.213	10.167.142.213
87	10.167.142.214/32	10.167.142.214 – 10.167.142.214	10.167.142.214
88	10.167.142.215/32	10.167.142.215 – 10.167.142.215	10.167.142.215
89	10.167.142.216/32	10.167.142.216 – 10.167.142.216	10.167.142.216
90	10.167.142.217/32	10.167.142.217 – 10.167.142.217	10.167.142.217
91	10.167.142.218/32	10.167.142.218 – 10.167.142.218	10.167.142.218
92	10.167.142.219/32	10.167.142.219 – 10.167.142.219	10.167.142.219
93	10.167.142.220/32	10.167.142.220 – 10.167.142.220	10.167.142.220
94	10.167.142.221/32	10.167.142.221 – 10.167.142.221	10.167.142.221
95	10.167.142.222/32	10.167.142.222 – 10.167.142.222	10.167.142.222
96	10.167.142.223/32	10.167.142.223 – 10.167.142.223	10.167.142.223
97	10.167.142.224/32	10.167.142.224 – 10.167.142.224	10.167.142.224
98	10.167.142.225/32	10.167.142.225 – 10.167.142.225	10.167.142.225
99	10.167.142.226/32	10.167.142.226 – 10.167.142.226	10.167.142.226
100	10.167.142.227/32	10.167.142.227 – 10.167.142.227	10.167.142.227
101	10.167.142.228/32	10.167.142.228 – 10.167.142.228	10.167.142.228
102	10.167.142.229/32	10.167.142.229 – 10.167.142.229	10.167.142.229
103	10.167.142.230/32	10.167.142.230 – 10.167.142.230	10.167.142.230
104	10.167.142.231/32	10.167.142.231 – 10.167.142.231	10.167.142.231
105	10.167.142.232/32	10.167.142.232 – 10.167.142.232	10.167.142.232
106	10.167.142.233/32	10.167.142.233 – 10.167.142.233	10.167.142.233
107	10.167.142.234/32	10.167.142.234 – 10.167.142.234	10.167.142.234
108	10.167.142.235/32	10.167.142.235 – 10.167.142.235	10.167.142.235
109	10.167.142.236/32	10.167.142.236 – 10.167.142.236	10.167.142.236
110	10.167.142.237/32	10.167.142.237 – 10.167.142.237	10.167.142.237
111	10.167.142.238/32	10.167.142.238 – 10.167.142.238	10.167.142.238
112	10.167.142.239/32	10.167.142.239 – 10.167.142.239	10.167.142.239
113	10.167.142.240/32	10.167.142.240 – 10.167.142.240	10.167.142.240
114	10.167.142.241/32	10.167.142.241 – 10.167.142.241	10.167.142.241
115	10.167.142.242/32	10.167.142.242 – 10.167.142.242	10.167.142.242
116	10.167.142.243/32	10.167.142.243 – 10.167.142.243	10.167.142.243
117	10.167.142.244/32	10.167.142.244 – 10.167.142.244	10.167.142.244
118	10.167.142.245/32	10.167.142.245 – 10.167.142.245	10.167.142.245
119	10.167.142.246/32	10.167.142.246 – 10.167.142.246	10.167.142.246
120	10.167.142.247/32	10.167.142.247 – 10.167.142.247	10.167.142.247
121	10.167.142.248/32	10.167.142.248 – 10.167.142.248	10.167.142.248
122	10.167.142.249/32	10.167.142.249 – 10.167.142.249	10.167.142.249
123	10.167.142.250/32	10.167.142.250 – 10.167.142.250	10.167.142.250
124	10.167.142.251/32	10.167.142.251 – 10.167.142.251	10.167.142.251
125	10.167.142.252/32	10.167.142.252 – 10.167.142.252	10.167.142.252
126	10.167.142.253/32	10.167.142.253 – 10.167.142.253	10.167.142.253
127	10.167.142.254/32	10.167.142.254 – 10.167.142.254	10.167.142.254
128	10.167.142.255/32	10.167.142.255 – 10.167.142.255	10.167.142.255

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 →