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)10.167.168.128/25

network10.167.168.128/25

broadcast10.167.168.255

first host10.167.168.129

last host10.167.168.254

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.167.168.128/25

address00001010.10100111.10101000.10000000

subnet mask11111111.11111111.11111111.10000000

network00001010.10100111.10101000.10000000

broadcast00001010.10100111.10101000.11111111

green = network part, grey = host part

hex0x0aa7a880

decimal178759808

reverse dns128.168.167.10.in-addr.arpa

ipv4-mapped::ffff:aa7:a880

/25 split into /32 · 128 subnets

close ×

#	network	host range	broadcast
1	10.167.168.128/32	10.167.168.128 – 10.167.168.128	10.167.168.128
2	10.167.168.129/32	10.167.168.129 – 10.167.168.129	10.167.168.129
3	10.167.168.130/32	10.167.168.130 – 10.167.168.130	10.167.168.130
4	10.167.168.131/32	10.167.168.131 – 10.167.168.131	10.167.168.131
5	10.167.168.132/32	10.167.168.132 – 10.167.168.132	10.167.168.132
6	10.167.168.133/32	10.167.168.133 – 10.167.168.133	10.167.168.133
7	10.167.168.134/32	10.167.168.134 – 10.167.168.134	10.167.168.134
8	10.167.168.135/32	10.167.168.135 – 10.167.168.135	10.167.168.135
9	10.167.168.136/32	10.167.168.136 – 10.167.168.136	10.167.168.136
10	10.167.168.137/32	10.167.168.137 – 10.167.168.137	10.167.168.137
11	10.167.168.138/32	10.167.168.138 – 10.167.168.138	10.167.168.138
12	10.167.168.139/32	10.167.168.139 – 10.167.168.139	10.167.168.139
13	10.167.168.140/32	10.167.168.140 – 10.167.168.140	10.167.168.140
14	10.167.168.141/32	10.167.168.141 – 10.167.168.141	10.167.168.141
15	10.167.168.142/32	10.167.168.142 – 10.167.168.142	10.167.168.142
16	10.167.168.143/32	10.167.168.143 – 10.167.168.143	10.167.168.143
17	10.167.168.144/32	10.167.168.144 – 10.167.168.144	10.167.168.144
18	10.167.168.145/32	10.167.168.145 – 10.167.168.145	10.167.168.145
19	10.167.168.146/32	10.167.168.146 – 10.167.168.146	10.167.168.146
20	10.167.168.147/32	10.167.168.147 – 10.167.168.147	10.167.168.147
21	10.167.168.148/32	10.167.168.148 – 10.167.168.148	10.167.168.148
22	10.167.168.149/32	10.167.168.149 – 10.167.168.149	10.167.168.149
23	10.167.168.150/32	10.167.168.150 – 10.167.168.150	10.167.168.150
24	10.167.168.151/32	10.167.168.151 – 10.167.168.151	10.167.168.151
25	10.167.168.152/32	10.167.168.152 – 10.167.168.152	10.167.168.152
26	10.167.168.153/32	10.167.168.153 – 10.167.168.153	10.167.168.153
27	10.167.168.154/32	10.167.168.154 – 10.167.168.154	10.167.168.154
28	10.167.168.155/32	10.167.168.155 – 10.167.168.155	10.167.168.155
29	10.167.168.156/32	10.167.168.156 – 10.167.168.156	10.167.168.156
30	10.167.168.157/32	10.167.168.157 – 10.167.168.157	10.167.168.157
31	10.167.168.158/32	10.167.168.158 – 10.167.168.158	10.167.168.158
32	10.167.168.159/32	10.167.168.159 – 10.167.168.159	10.167.168.159
33	10.167.168.160/32	10.167.168.160 – 10.167.168.160	10.167.168.160
34	10.167.168.161/32	10.167.168.161 – 10.167.168.161	10.167.168.161
35	10.167.168.162/32	10.167.168.162 – 10.167.168.162	10.167.168.162
36	10.167.168.163/32	10.167.168.163 – 10.167.168.163	10.167.168.163
37	10.167.168.164/32	10.167.168.164 – 10.167.168.164	10.167.168.164
38	10.167.168.165/32	10.167.168.165 – 10.167.168.165	10.167.168.165
39	10.167.168.166/32	10.167.168.166 – 10.167.168.166	10.167.168.166
40	10.167.168.167/32	10.167.168.167 – 10.167.168.167	10.167.168.167
41	10.167.168.168/32	10.167.168.168 – 10.167.168.168	10.167.168.168
42	10.167.168.169/32	10.167.168.169 – 10.167.168.169	10.167.168.169
43	10.167.168.170/32	10.167.168.170 – 10.167.168.170	10.167.168.170
44	10.167.168.171/32	10.167.168.171 – 10.167.168.171	10.167.168.171
45	10.167.168.172/32	10.167.168.172 – 10.167.168.172	10.167.168.172
46	10.167.168.173/32	10.167.168.173 – 10.167.168.173	10.167.168.173
47	10.167.168.174/32	10.167.168.174 – 10.167.168.174	10.167.168.174
48	10.167.168.175/32	10.167.168.175 – 10.167.168.175	10.167.168.175
49	10.167.168.176/32	10.167.168.176 – 10.167.168.176	10.167.168.176
50	10.167.168.177/32	10.167.168.177 – 10.167.168.177	10.167.168.177
51	10.167.168.178/32	10.167.168.178 – 10.167.168.178	10.167.168.178
52	10.167.168.179/32	10.167.168.179 – 10.167.168.179	10.167.168.179
53	10.167.168.180/32	10.167.168.180 – 10.167.168.180	10.167.168.180
54	10.167.168.181/32	10.167.168.181 – 10.167.168.181	10.167.168.181
55	10.167.168.182/32	10.167.168.182 – 10.167.168.182	10.167.168.182
56	10.167.168.183/32	10.167.168.183 – 10.167.168.183	10.167.168.183
57	10.167.168.184/32	10.167.168.184 – 10.167.168.184	10.167.168.184
58	10.167.168.185/32	10.167.168.185 – 10.167.168.185	10.167.168.185
59	10.167.168.186/32	10.167.168.186 – 10.167.168.186	10.167.168.186
60	10.167.168.187/32	10.167.168.187 – 10.167.168.187	10.167.168.187
61	10.167.168.188/32	10.167.168.188 – 10.167.168.188	10.167.168.188
62	10.167.168.189/32	10.167.168.189 – 10.167.168.189	10.167.168.189
63	10.167.168.190/32	10.167.168.190 – 10.167.168.190	10.167.168.190
64	10.167.168.191/32	10.167.168.191 – 10.167.168.191	10.167.168.191
65	10.167.168.192/32	10.167.168.192 – 10.167.168.192	10.167.168.192
66	10.167.168.193/32	10.167.168.193 – 10.167.168.193	10.167.168.193
67	10.167.168.194/32	10.167.168.194 – 10.167.168.194	10.167.168.194
68	10.167.168.195/32	10.167.168.195 – 10.167.168.195	10.167.168.195
69	10.167.168.196/32	10.167.168.196 – 10.167.168.196	10.167.168.196
70	10.167.168.197/32	10.167.168.197 – 10.167.168.197	10.167.168.197
71	10.167.168.198/32	10.167.168.198 – 10.167.168.198	10.167.168.198
72	10.167.168.199/32	10.167.168.199 – 10.167.168.199	10.167.168.199
73	10.167.168.200/32	10.167.168.200 – 10.167.168.200	10.167.168.200
74	10.167.168.201/32	10.167.168.201 – 10.167.168.201	10.167.168.201
75	10.167.168.202/32	10.167.168.202 – 10.167.168.202	10.167.168.202
76	10.167.168.203/32	10.167.168.203 – 10.167.168.203	10.167.168.203
77	10.167.168.204/32	10.167.168.204 – 10.167.168.204	10.167.168.204
78	10.167.168.205/32	10.167.168.205 – 10.167.168.205	10.167.168.205
79	10.167.168.206/32	10.167.168.206 – 10.167.168.206	10.167.168.206
80	10.167.168.207/32	10.167.168.207 – 10.167.168.207	10.167.168.207
81	10.167.168.208/32	10.167.168.208 – 10.167.168.208	10.167.168.208
82	10.167.168.209/32	10.167.168.209 – 10.167.168.209	10.167.168.209
83	10.167.168.210/32	10.167.168.210 – 10.167.168.210	10.167.168.210
84	10.167.168.211/32	10.167.168.211 – 10.167.168.211	10.167.168.211
85	10.167.168.212/32	10.167.168.212 – 10.167.168.212	10.167.168.212
86	10.167.168.213/32	10.167.168.213 – 10.167.168.213	10.167.168.213
87	10.167.168.214/32	10.167.168.214 – 10.167.168.214	10.167.168.214
88	10.167.168.215/32	10.167.168.215 – 10.167.168.215	10.167.168.215
89	10.167.168.216/32	10.167.168.216 – 10.167.168.216	10.167.168.216
90	10.167.168.217/32	10.167.168.217 – 10.167.168.217	10.167.168.217
91	10.167.168.218/32	10.167.168.218 – 10.167.168.218	10.167.168.218
92	10.167.168.219/32	10.167.168.219 – 10.167.168.219	10.167.168.219
93	10.167.168.220/32	10.167.168.220 – 10.167.168.220	10.167.168.220
94	10.167.168.221/32	10.167.168.221 – 10.167.168.221	10.167.168.221
95	10.167.168.222/32	10.167.168.222 – 10.167.168.222	10.167.168.222
96	10.167.168.223/32	10.167.168.223 – 10.167.168.223	10.167.168.223
97	10.167.168.224/32	10.167.168.224 – 10.167.168.224	10.167.168.224
98	10.167.168.225/32	10.167.168.225 – 10.167.168.225	10.167.168.225
99	10.167.168.226/32	10.167.168.226 – 10.167.168.226	10.167.168.226
100	10.167.168.227/32	10.167.168.227 – 10.167.168.227	10.167.168.227
101	10.167.168.228/32	10.167.168.228 – 10.167.168.228	10.167.168.228
102	10.167.168.229/32	10.167.168.229 – 10.167.168.229	10.167.168.229
103	10.167.168.230/32	10.167.168.230 – 10.167.168.230	10.167.168.230
104	10.167.168.231/32	10.167.168.231 – 10.167.168.231	10.167.168.231
105	10.167.168.232/32	10.167.168.232 – 10.167.168.232	10.167.168.232
106	10.167.168.233/32	10.167.168.233 – 10.167.168.233	10.167.168.233
107	10.167.168.234/32	10.167.168.234 – 10.167.168.234	10.167.168.234
108	10.167.168.235/32	10.167.168.235 – 10.167.168.235	10.167.168.235
109	10.167.168.236/32	10.167.168.236 – 10.167.168.236	10.167.168.236
110	10.167.168.237/32	10.167.168.237 – 10.167.168.237	10.167.168.237
111	10.167.168.238/32	10.167.168.238 – 10.167.168.238	10.167.168.238
112	10.167.168.239/32	10.167.168.239 – 10.167.168.239	10.167.168.239
113	10.167.168.240/32	10.167.168.240 – 10.167.168.240	10.167.168.240
114	10.167.168.241/32	10.167.168.241 – 10.167.168.241	10.167.168.241
115	10.167.168.242/32	10.167.168.242 – 10.167.168.242	10.167.168.242
116	10.167.168.243/32	10.167.168.243 – 10.167.168.243	10.167.168.243
117	10.167.168.244/32	10.167.168.244 – 10.167.168.244	10.167.168.244
118	10.167.168.245/32	10.167.168.245 – 10.167.168.245	10.167.168.245
119	10.167.168.246/32	10.167.168.246 – 10.167.168.246	10.167.168.246
120	10.167.168.247/32	10.167.168.247 – 10.167.168.247	10.167.168.247
121	10.167.168.248/32	10.167.168.248 – 10.167.168.248	10.167.168.248
122	10.167.168.249/32	10.167.168.249 – 10.167.168.249	10.167.168.249
123	10.167.168.250/32	10.167.168.250 – 10.167.168.250	10.167.168.250
124	10.167.168.251/32	10.167.168.251 – 10.167.168.251	10.167.168.251
125	10.167.168.252/32	10.167.168.252 – 10.167.168.252	10.167.168.252
126	10.167.168.253/32	10.167.168.253 – 10.167.168.253	10.167.168.253
127	10.167.168.254/32	10.167.168.254 – 10.167.168.254	10.167.168.254
128	10.167.168.255/32	10.167.168.255 – 10.167.168.255	10.167.168.255

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 →