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)10.167.83.128/25

network10.167.83.128/25

broadcast10.167.83.255

first host10.167.83.129

last host10.167.83.254

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.167.83.128/25

address00001010.10100111.01010011.10000000

subnet mask11111111.11111111.11111111.10000000

network00001010.10100111.01010011.10000000

broadcast00001010.10100111.01010011.11111111

green = network part, grey = host part

hex0x0aa75380

decimal178738048

reverse dns128.83.167.10.in-addr.arpa

ipv4-mapped::ffff:aa7:5380

/25 split into /32 · 128 subnets

close ×

#	network	host range	broadcast
1	10.167.83.128/32	10.167.83.128 – 10.167.83.128	10.167.83.128
2	10.167.83.129/32	10.167.83.129 – 10.167.83.129	10.167.83.129
3	10.167.83.130/32	10.167.83.130 – 10.167.83.130	10.167.83.130
4	10.167.83.131/32	10.167.83.131 – 10.167.83.131	10.167.83.131
5	10.167.83.132/32	10.167.83.132 – 10.167.83.132	10.167.83.132
6	10.167.83.133/32	10.167.83.133 – 10.167.83.133	10.167.83.133
7	10.167.83.134/32	10.167.83.134 – 10.167.83.134	10.167.83.134
8	10.167.83.135/32	10.167.83.135 – 10.167.83.135	10.167.83.135
9	10.167.83.136/32	10.167.83.136 – 10.167.83.136	10.167.83.136
10	10.167.83.137/32	10.167.83.137 – 10.167.83.137	10.167.83.137
11	10.167.83.138/32	10.167.83.138 – 10.167.83.138	10.167.83.138
12	10.167.83.139/32	10.167.83.139 – 10.167.83.139	10.167.83.139
13	10.167.83.140/32	10.167.83.140 – 10.167.83.140	10.167.83.140
14	10.167.83.141/32	10.167.83.141 – 10.167.83.141	10.167.83.141
15	10.167.83.142/32	10.167.83.142 – 10.167.83.142	10.167.83.142
16	10.167.83.143/32	10.167.83.143 – 10.167.83.143	10.167.83.143
17	10.167.83.144/32	10.167.83.144 – 10.167.83.144	10.167.83.144
18	10.167.83.145/32	10.167.83.145 – 10.167.83.145	10.167.83.145
19	10.167.83.146/32	10.167.83.146 – 10.167.83.146	10.167.83.146
20	10.167.83.147/32	10.167.83.147 – 10.167.83.147	10.167.83.147
21	10.167.83.148/32	10.167.83.148 – 10.167.83.148	10.167.83.148
22	10.167.83.149/32	10.167.83.149 – 10.167.83.149	10.167.83.149
23	10.167.83.150/32	10.167.83.150 – 10.167.83.150	10.167.83.150
24	10.167.83.151/32	10.167.83.151 – 10.167.83.151	10.167.83.151
25	10.167.83.152/32	10.167.83.152 – 10.167.83.152	10.167.83.152
26	10.167.83.153/32	10.167.83.153 – 10.167.83.153	10.167.83.153
27	10.167.83.154/32	10.167.83.154 – 10.167.83.154	10.167.83.154
28	10.167.83.155/32	10.167.83.155 – 10.167.83.155	10.167.83.155
29	10.167.83.156/32	10.167.83.156 – 10.167.83.156	10.167.83.156
30	10.167.83.157/32	10.167.83.157 – 10.167.83.157	10.167.83.157
31	10.167.83.158/32	10.167.83.158 – 10.167.83.158	10.167.83.158
32	10.167.83.159/32	10.167.83.159 – 10.167.83.159	10.167.83.159
33	10.167.83.160/32	10.167.83.160 – 10.167.83.160	10.167.83.160
34	10.167.83.161/32	10.167.83.161 – 10.167.83.161	10.167.83.161
35	10.167.83.162/32	10.167.83.162 – 10.167.83.162	10.167.83.162
36	10.167.83.163/32	10.167.83.163 – 10.167.83.163	10.167.83.163
37	10.167.83.164/32	10.167.83.164 – 10.167.83.164	10.167.83.164
38	10.167.83.165/32	10.167.83.165 – 10.167.83.165	10.167.83.165
39	10.167.83.166/32	10.167.83.166 – 10.167.83.166	10.167.83.166
40	10.167.83.167/32	10.167.83.167 – 10.167.83.167	10.167.83.167
41	10.167.83.168/32	10.167.83.168 – 10.167.83.168	10.167.83.168
42	10.167.83.169/32	10.167.83.169 – 10.167.83.169	10.167.83.169
43	10.167.83.170/32	10.167.83.170 – 10.167.83.170	10.167.83.170
44	10.167.83.171/32	10.167.83.171 – 10.167.83.171	10.167.83.171
45	10.167.83.172/32	10.167.83.172 – 10.167.83.172	10.167.83.172
46	10.167.83.173/32	10.167.83.173 – 10.167.83.173	10.167.83.173
47	10.167.83.174/32	10.167.83.174 – 10.167.83.174	10.167.83.174
48	10.167.83.175/32	10.167.83.175 – 10.167.83.175	10.167.83.175
49	10.167.83.176/32	10.167.83.176 – 10.167.83.176	10.167.83.176
50	10.167.83.177/32	10.167.83.177 – 10.167.83.177	10.167.83.177
51	10.167.83.178/32	10.167.83.178 – 10.167.83.178	10.167.83.178
52	10.167.83.179/32	10.167.83.179 – 10.167.83.179	10.167.83.179
53	10.167.83.180/32	10.167.83.180 – 10.167.83.180	10.167.83.180
54	10.167.83.181/32	10.167.83.181 – 10.167.83.181	10.167.83.181
55	10.167.83.182/32	10.167.83.182 – 10.167.83.182	10.167.83.182
56	10.167.83.183/32	10.167.83.183 – 10.167.83.183	10.167.83.183
57	10.167.83.184/32	10.167.83.184 – 10.167.83.184	10.167.83.184
58	10.167.83.185/32	10.167.83.185 – 10.167.83.185	10.167.83.185
59	10.167.83.186/32	10.167.83.186 – 10.167.83.186	10.167.83.186
60	10.167.83.187/32	10.167.83.187 – 10.167.83.187	10.167.83.187
61	10.167.83.188/32	10.167.83.188 – 10.167.83.188	10.167.83.188
62	10.167.83.189/32	10.167.83.189 – 10.167.83.189	10.167.83.189
63	10.167.83.190/32	10.167.83.190 – 10.167.83.190	10.167.83.190
64	10.167.83.191/32	10.167.83.191 – 10.167.83.191	10.167.83.191
65	10.167.83.192/32	10.167.83.192 – 10.167.83.192	10.167.83.192
66	10.167.83.193/32	10.167.83.193 – 10.167.83.193	10.167.83.193
67	10.167.83.194/32	10.167.83.194 – 10.167.83.194	10.167.83.194
68	10.167.83.195/32	10.167.83.195 – 10.167.83.195	10.167.83.195
69	10.167.83.196/32	10.167.83.196 – 10.167.83.196	10.167.83.196
70	10.167.83.197/32	10.167.83.197 – 10.167.83.197	10.167.83.197
71	10.167.83.198/32	10.167.83.198 – 10.167.83.198	10.167.83.198
72	10.167.83.199/32	10.167.83.199 – 10.167.83.199	10.167.83.199
73	10.167.83.200/32	10.167.83.200 – 10.167.83.200	10.167.83.200
74	10.167.83.201/32	10.167.83.201 – 10.167.83.201	10.167.83.201
75	10.167.83.202/32	10.167.83.202 – 10.167.83.202	10.167.83.202
76	10.167.83.203/32	10.167.83.203 – 10.167.83.203	10.167.83.203
77	10.167.83.204/32	10.167.83.204 – 10.167.83.204	10.167.83.204
78	10.167.83.205/32	10.167.83.205 – 10.167.83.205	10.167.83.205
79	10.167.83.206/32	10.167.83.206 – 10.167.83.206	10.167.83.206
80	10.167.83.207/32	10.167.83.207 – 10.167.83.207	10.167.83.207
81	10.167.83.208/32	10.167.83.208 – 10.167.83.208	10.167.83.208
82	10.167.83.209/32	10.167.83.209 – 10.167.83.209	10.167.83.209
83	10.167.83.210/32	10.167.83.210 – 10.167.83.210	10.167.83.210
84	10.167.83.211/32	10.167.83.211 – 10.167.83.211	10.167.83.211
85	10.167.83.212/32	10.167.83.212 – 10.167.83.212	10.167.83.212
86	10.167.83.213/32	10.167.83.213 – 10.167.83.213	10.167.83.213
87	10.167.83.214/32	10.167.83.214 – 10.167.83.214	10.167.83.214
88	10.167.83.215/32	10.167.83.215 – 10.167.83.215	10.167.83.215
89	10.167.83.216/32	10.167.83.216 – 10.167.83.216	10.167.83.216
90	10.167.83.217/32	10.167.83.217 – 10.167.83.217	10.167.83.217
91	10.167.83.218/32	10.167.83.218 – 10.167.83.218	10.167.83.218
92	10.167.83.219/32	10.167.83.219 – 10.167.83.219	10.167.83.219
93	10.167.83.220/32	10.167.83.220 – 10.167.83.220	10.167.83.220
94	10.167.83.221/32	10.167.83.221 – 10.167.83.221	10.167.83.221
95	10.167.83.222/32	10.167.83.222 – 10.167.83.222	10.167.83.222
96	10.167.83.223/32	10.167.83.223 – 10.167.83.223	10.167.83.223
97	10.167.83.224/32	10.167.83.224 – 10.167.83.224	10.167.83.224
98	10.167.83.225/32	10.167.83.225 – 10.167.83.225	10.167.83.225
99	10.167.83.226/32	10.167.83.226 – 10.167.83.226	10.167.83.226
100	10.167.83.227/32	10.167.83.227 – 10.167.83.227	10.167.83.227
101	10.167.83.228/32	10.167.83.228 – 10.167.83.228	10.167.83.228
102	10.167.83.229/32	10.167.83.229 – 10.167.83.229	10.167.83.229
103	10.167.83.230/32	10.167.83.230 – 10.167.83.230	10.167.83.230
104	10.167.83.231/32	10.167.83.231 – 10.167.83.231	10.167.83.231
105	10.167.83.232/32	10.167.83.232 – 10.167.83.232	10.167.83.232
106	10.167.83.233/32	10.167.83.233 – 10.167.83.233	10.167.83.233
107	10.167.83.234/32	10.167.83.234 – 10.167.83.234	10.167.83.234
108	10.167.83.235/32	10.167.83.235 – 10.167.83.235	10.167.83.235
109	10.167.83.236/32	10.167.83.236 – 10.167.83.236	10.167.83.236
110	10.167.83.237/32	10.167.83.237 – 10.167.83.237	10.167.83.237
111	10.167.83.238/32	10.167.83.238 – 10.167.83.238	10.167.83.238
112	10.167.83.239/32	10.167.83.239 – 10.167.83.239	10.167.83.239
113	10.167.83.240/32	10.167.83.240 – 10.167.83.240	10.167.83.240
114	10.167.83.241/32	10.167.83.241 – 10.167.83.241	10.167.83.241
115	10.167.83.242/32	10.167.83.242 – 10.167.83.242	10.167.83.242
116	10.167.83.243/32	10.167.83.243 – 10.167.83.243	10.167.83.243
117	10.167.83.244/32	10.167.83.244 – 10.167.83.244	10.167.83.244
118	10.167.83.245/32	10.167.83.245 – 10.167.83.245	10.167.83.245
119	10.167.83.246/32	10.167.83.246 – 10.167.83.246	10.167.83.246
120	10.167.83.247/32	10.167.83.247 – 10.167.83.247	10.167.83.247
121	10.167.83.248/32	10.167.83.248 – 10.167.83.248	10.167.83.248
122	10.167.83.249/32	10.167.83.249 – 10.167.83.249	10.167.83.249
123	10.167.83.250/32	10.167.83.250 – 10.167.83.250	10.167.83.250
124	10.167.83.251/32	10.167.83.251 – 10.167.83.251	10.167.83.251
125	10.167.83.252/32	10.167.83.252 – 10.167.83.252	10.167.83.252
126	10.167.83.253/32	10.167.83.253 – 10.167.83.253	10.167.83.253
127	10.167.83.254/32	10.167.83.254 – 10.167.83.254	10.167.83.254
128	10.167.83.255/32	10.167.83.255 – 10.167.83.255	10.167.83.255

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 →