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)10.167.86.128/25

network10.167.86.128/25

broadcast10.167.86.255

first host10.167.86.129

last host10.167.86.254

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.167.86.128/25

address00001010.10100111.01010110.10000000

subnet mask11111111.11111111.11111111.10000000

network00001010.10100111.01010110.10000000

broadcast00001010.10100111.01010110.11111111

green = network part, grey = host part

hex0x0aa75680

decimal178738816

reverse dns128.86.167.10.in-addr.arpa

ipv4-mapped::ffff:aa7:5680

/25 split into /32 · 128 subnets

close ×

#	network	host range	broadcast
1	10.167.86.128/32	10.167.86.128 – 10.167.86.128	10.167.86.128
2	10.167.86.129/32	10.167.86.129 – 10.167.86.129	10.167.86.129
3	10.167.86.130/32	10.167.86.130 – 10.167.86.130	10.167.86.130
4	10.167.86.131/32	10.167.86.131 – 10.167.86.131	10.167.86.131
5	10.167.86.132/32	10.167.86.132 – 10.167.86.132	10.167.86.132
6	10.167.86.133/32	10.167.86.133 – 10.167.86.133	10.167.86.133
7	10.167.86.134/32	10.167.86.134 – 10.167.86.134	10.167.86.134
8	10.167.86.135/32	10.167.86.135 – 10.167.86.135	10.167.86.135
9	10.167.86.136/32	10.167.86.136 – 10.167.86.136	10.167.86.136
10	10.167.86.137/32	10.167.86.137 – 10.167.86.137	10.167.86.137
11	10.167.86.138/32	10.167.86.138 – 10.167.86.138	10.167.86.138
12	10.167.86.139/32	10.167.86.139 – 10.167.86.139	10.167.86.139
13	10.167.86.140/32	10.167.86.140 – 10.167.86.140	10.167.86.140
14	10.167.86.141/32	10.167.86.141 – 10.167.86.141	10.167.86.141
15	10.167.86.142/32	10.167.86.142 – 10.167.86.142	10.167.86.142
16	10.167.86.143/32	10.167.86.143 – 10.167.86.143	10.167.86.143
17	10.167.86.144/32	10.167.86.144 – 10.167.86.144	10.167.86.144
18	10.167.86.145/32	10.167.86.145 – 10.167.86.145	10.167.86.145
19	10.167.86.146/32	10.167.86.146 – 10.167.86.146	10.167.86.146
20	10.167.86.147/32	10.167.86.147 – 10.167.86.147	10.167.86.147
21	10.167.86.148/32	10.167.86.148 – 10.167.86.148	10.167.86.148
22	10.167.86.149/32	10.167.86.149 – 10.167.86.149	10.167.86.149
23	10.167.86.150/32	10.167.86.150 – 10.167.86.150	10.167.86.150
24	10.167.86.151/32	10.167.86.151 – 10.167.86.151	10.167.86.151
25	10.167.86.152/32	10.167.86.152 – 10.167.86.152	10.167.86.152
26	10.167.86.153/32	10.167.86.153 – 10.167.86.153	10.167.86.153
27	10.167.86.154/32	10.167.86.154 – 10.167.86.154	10.167.86.154
28	10.167.86.155/32	10.167.86.155 – 10.167.86.155	10.167.86.155
29	10.167.86.156/32	10.167.86.156 – 10.167.86.156	10.167.86.156
30	10.167.86.157/32	10.167.86.157 – 10.167.86.157	10.167.86.157
31	10.167.86.158/32	10.167.86.158 – 10.167.86.158	10.167.86.158
32	10.167.86.159/32	10.167.86.159 – 10.167.86.159	10.167.86.159
33	10.167.86.160/32	10.167.86.160 – 10.167.86.160	10.167.86.160
34	10.167.86.161/32	10.167.86.161 – 10.167.86.161	10.167.86.161
35	10.167.86.162/32	10.167.86.162 – 10.167.86.162	10.167.86.162
36	10.167.86.163/32	10.167.86.163 – 10.167.86.163	10.167.86.163
37	10.167.86.164/32	10.167.86.164 – 10.167.86.164	10.167.86.164
38	10.167.86.165/32	10.167.86.165 – 10.167.86.165	10.167.86.165
39	10.167.86.166/32	10.167.86.166 – 10.167.86.166	10.167.86.166
40	10.167.86.167/32	10.167.86.167 – 10.167.86.167	10.167.86.167
41	10.167.86.168/32	10.167.86.168 – 10.167.86.168	10.167.86.168
42	10.167.86.169/32	10.167.86.169 – 10.167.86.169	10.167.86.169
43	10.167.86.170/32	10.167.86.170 – 10.167.86.170	10.167.86.170
44	10.167.86.171/32	10.167.86.171 – 10.167.86.171	10.167.86.171
45	10.167.86.172/32	10.167.86.172 – 10.167.86.172	10.167.86.172
46	10.167.86.173/32	10.167.86.173 – 10.167.86.173	10.167.86.173
47	10.167.86.174/32	10.167.86.174 – 10.167.86.174	10.167.86.174
48	10.167.86.175/32	10.167.86.175 – 10.167.86.175	10.167.86.175
49	10.167.86.176/32	10.167.86.176 – 10.167.86.176	10.167.86.176
50	10.167.86.177/32	10.167.86.177 – 10.167.86.177	10.167.86.177
51	10.167.86.178/32	10.167.86.178 – 10.167.86.178	10.167.86.178
52	10.167.86.179/32	10.167.86.179 – 10.167.86.179	10.167.86.179
53	10.167.86.180/32	10.167.86.180 – 10.167.86.180	10.167.86.180
54	10.167.86.181/32	10.167.86.181 – 10.167.86.181	10.167.86.181
55	10.167.86.182/32	10.167.86.182 – 10.167.86.182	10.167.86.182
56	10.167.86.183/32	10.167.86.183 – 10.167.86.183	10.167.86.183
57	10.167.86.184/32	10.167.86.184 – 10.167.86.184	10.167.86.184
58	10.167.86.185/32	10.167.86.185 – 10.167.86.185	10.167.86.185
59	10.167.86.186/32	10.167.86.186 – 10.167.86.186	10.167.86.186
60	10.167.86.187/32	10.167.86.187 – 10.167.86.187	10.167.86.187
61	10.167.86.188/32	10.167.86.188 – 10.167.86.188	10.167.86.188
62	10.167.86.189/32	10.167.86.189 – 10.167.86.189	10.167.86.189
63	10.167.86.190/32	10.167.86.190 – 10.167.86.190	10.167.86.190
64	10.167.86.191/32	10.167.86.191 – 10.167.86.191	10.167.86.191
65	10.167.86.192/32	10.167.86.192 – 10.167.86.192	10.167.86.192
66	10.167.86.193/32	10.167.86.193 – 10.167.86.193	10.167.86.193
67	10.167.86.194/32	10.167.86.194 – 10.167.86.194	10.167.86.194
68	10.167.86.195/32	10.167.86.195 – 10.167.86.195	10.167.86.195
69	10.167.86.196/32	10.167.86.196 – 10.167.86.196	10.167.86.196
70	10.167.86.197/32	10.167.86.197 – 10.167.86.197	10.167.86.197
71	10.167.86.198/32	10.167.86.198 – 10.167.86.198	10.167.86.198
72	10.167.86.199/32	10.167.86.199 – 10.167.86.199	10.167.86.199
73	10.167.86.200/32	10.167.86.200 – 10.167.86.200	10.167.86.200
74	10.167.86.201/32	10.167.86.201 – 10.167.86.201	10.167.86.201
75	10.167.86.202/32	10.167.86.202 – 10.167.86.202	10.167.86.202
76	10.167.86.203/32	10.167.86.203 – 10.167.86.203	10.167.86.203
77	10.167.86.204/32	10.167.86.204 – 10.167.86.204	10.167.86.204
78	10.167.86.205/32	10.167.86.205 – 10.167.86.205	10.167.86.205
79	10.167.86.206/32	10.167.86.206 – 10.167.86.206	10.167.86.206
80	10.167.86.207/32	10.167.86.207 – 10.167.86.207	10.167.86.207
81	10.167.86.208/32	10.167.86.208 – 10.167.86.208	10.167.86.208
82	10.167.86.209/32	10.167.86.209 – 10.167.86.209	10.167.86.209
83	10.167.86.210/32	10.167.86.210 – 10.167.86.210	10.167.86.210
84	10.167.86.211/32	10.167.86.211 – 10.167.86.211	10.167.86.211
85	10.167.86.212/32	10.167.86.212 – 10.167.86.212	10.167.86.212
86	10.167.86.213/32	10.167.86.213 – 10.167.86.213	10.167.86.213
87	10.167.86.214/32	10.167.86.214 – 10.167.86.214	10.167.86.214
88	10.167.86.215/32	10.167.86.215 – 10.167.86.215	10.167.86.215
89	10.167.86.216/32	10.167.86.216 – 10.167.86.216	10.167.86.216
90	10.167.86.217/32	10.167.86.217 – 10.167.86.217	10.167.86.217
91	10.167.86.218/32	10.167.86.218 – 10.167.86.218	10.167.86.218
92	10.167.86.219/32	10.167.86.219 – 10.167.86.219	10.167.86.219
93	10.167.86.220/32	10.167.86.220 – 10.167.86.220	10.167.86.220
94	10.167.86.221/32	10.167.86.221 – 10.167.86.221	10.167.86.221
95	10.167.86.222/32	10.167.86.222 – 10.167.86.222	10.167.86.222
96	10.167.86.223/32	10.167.86.223 – 10.167.86.223	10.167.86.223
97	10.167.86.224/32	10.167.86.224 – 10.167.86.224	10.167.86.224
98	10.167.86.225/32	10.167.86.225 – 10.167.86.225	10.167.86.225
99	10.167.86.226/32	10.167.86.226 – 10.167.86.226	10.167.86.226
100	10.167.86.227/32	10.167.86.227 – 10.167.86.227	10.167.86.227
101	10.167.86.228/32	10.167.86.228 – 10.167.86.228	10.167.86.228
102	10.167.86.229/32	10.167.86.229 – 10.167.86.229	10.167.86.229
103	10.167.86.230/32	10.167.86.230 – 10.167.86.230	10.167.86.230
104	10.167.86.231/32	10.167.86.231 – 10.167.86.231	10.167.86.231
105	10.167.86.232/32	10.167.86.232 – 10.167.86.232	10.167.86.232
106	10.167.86.233/32	10.167.86.233 – 10.167.86.233	10.167.86.233
107	10.167.86.234/32	10.167.86.234 – 10.167.86.234	10.167.86.234
108	10.167.86.235/32	10.167.86.235 – 10.167.86.235	10.167.86.235
109	10.167.86.236/32	10.167.86.236 – 10.167.86.236	10.167.86.236
110	10.167.86.237/32	10.167.86.237 – 10.167.86.237	10.167.86.237
111	10.167.86.238/32	10.167.86.238 – 10.167.86.238	10.167.86.238
112	10.167.86.239/32	10.167.86.239 – 10.167.86.239	10.167.86.239
113	10.167.86.240/32	10.167.86.240 – 10.167.86.240	10.167.86.240
114	10.167.86.241/32	10.167.86.241 – 10.167.86.241	10.167.86.241
115	10.167.86.242/32	10.167.86.242 – 10.167.86.242	10.167.86.242
116	10.167.86.243/32	10.167.86.243 – 10.167.86.243	10.167.86.243
117	10.167.86.244/32	10.167.86.244 – 10.167.86.244	10.167.86.244
118	10.167.86.245/32	10.167.86.245 – 10.167.86.245	10.167.86.245
119	10.167.86.246/32	10.167.86.246 – 10.167.86.246	10.167.86.246
120	10.167.86.247/32	10.167.86.247 – 10.167.86.247	10.167.86.247
121	10.167.86.248/32	10.167.86.248 – 10.167.86.248	10.167.86.248
122	10.167.86.249/32	10.167.86.249 – 10.167.86.249	10.167.86.249
123	10.167.86.250/32	10.167.86.250 – 10.167.86.250	10.167.86.250
124	10.167.86.251/32	10.167.86.251 – 10.167.86.251	10.167.86.251
125	10.167.86.252/32	10.167.86.252 – 10.167.86.252	10.167.86.252
126	10.167.86.253/32	10.167.86.253 – 10.167.86.253	10.167.86.253
127	10.167.86.254/32	10.167.86.254 – 10.167.86.254	10.167.86.254
128	10.167.86.255/32	10.167.86.255 – 10.167.86.255	10.167.86.255

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 →