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)10.167.238.128/25

network10.167.238.128/25

broadcast10.167.238.255

first host10.167.238.129

last host10.167.238.254

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.167.238.128/25

address00001010.10100111.11101110.10000000

subnet mask11111111.11111111.11111111.10000000

network00001010.10100111.11101110.10000000

broadcast00001010.10100111.11101110.11111111

green = network part, grey = host part

hex0x0aa7ee80

decimal178777728

reverse dns128.238.167.10.in-addr.arpa

ipv4-mapped::ffff:aa7:ee80

/25 split into /32 · 128 subnets

close ×

#	network	host range	broadcast
1	10.167.238.128/32	10.167.238.128 – 10.167.238.128	10.167.238.128
2	10.167.238.129/32	10.167.238.129 – 10.167.238.129	10.167.238.129
3	10.167.238.130/32	10.167.238.130 – 10.167.238.130	10.167.238.130
4	10.167.238.131/32	10.167.238.131 – 10.167.238.131	10.167.238.131
5	10.167.238.132/32	10.167.238.132 – 10.167.238.132	10.167.238.132
6	10.167.238.133/32	10.167.238.133 – 10.167.238.133	10.167.238.133
7	10.167.238.134/32	10.167.238.134 – 10.167.238.134	10.167.238.134
8	10.167.238.135/32	10.167.238.135 – 10.167.238.135	10.167.238.135
9	10.167.238.136/32	10.167.238.136 – 10.167.238.136	10.167.238.136
10	10.167.238.137/32	10.167.238.137 – 10.167.238.137	10.167.238.137
11	10.167.238.138/32	10.167.238.138 – 10.167.238.138	10.167.238.138
12	10.167.238.139/32	10.167.238.139 – 10.167.238.139	10.167.238.139
13	10.167.238.140/32	10.167.238.140 – 10.167.238.140	10.167.238.140
14	10.167.238.141/32	10.167.238.141 – 10.167.238.141	10.167.238.141
15	10.167.238.142/32	10.167.238.142 – 10.167.238.142	10.167.238.142
16	10.167.238.143/32	10.167.238.143 – 10.167.238.143	10.167.238.143
17	10.167.238.144/32	10.167.238.144 – 10.167.238.144	10.167.238.144
18	10.167.238.145/32	10.167.238.145 – 10.167.238.145	10.167.238.145
19	10.167.238.146/32	10.167.238.146 – 10.167.238.146	10.167.238.146
20	10.167.238.147/32	10.167.238.147 – 10.167.238.147	10.167.238.147
21	10.167.238.148/32	10.167.238.148 – 10.167.238.148	10.167.238.148
22	10.167.238.149/32	10.167.238.149 – 10.167.238.149	10.167.238.149
23	10.167.238.150/32	10.167.238.150 – 10.167.238.150	10.167.238.150
24	10.167.238.151/32	10.167.238.151 – 10.167.238.151	10.167.238.151
25	10.167.238.152/32	10.167.238.152 – 10.167.238.152	10.167.238.152
26	10.167.238.153/32	10.167.238.153 – 10.167.238.153	10.167.238.153
27	10.167.238.154/32	10.167.238.154 – 10.167.238.154	10.167.238.154
28	10.167.238.155/32	10.167.238.155 – 10.167.238.155	10.167.238.155
29	10.167.238.156/32	10.167.238.156 – 10.167.238.156	10.167.238.156
30	10.167.238.157/32	10.167.238.157 – 10.167.238.157	10.167.238.157
31	10.167.238.158/32	10.167.238.158 – 10.167.238.158	10.167.238.158
32	10.167.238.159/32	10.167.238.159 – 10.167.238.159	10.167.238.159
33	10.167.238.160/32	10.167.238.160 – 10.167.238.160	10.167.238.160
34	10.167.238.161/32	10.167.238.161 – 10.167.238.161	10.167.238.161
35	10.167.238.162/32	10.167.238.162 – 10.167.238.162	10.167.238.162
36	10.167.238.163/32	10.167.238.163 – 10.167.238.163	10.167.238.163
37	10.167.238.164/32	10.167.238.164 – 10.167.238.164	10.167.238.164
38	10.167.238.165/32	10.167.238.165 – 10.167.238.165	10.167.238.165
39	10.167.238.166/32	10.167.238.166 – 10.167.238.166	10.167.238.166
40	10.167.238.167/32	10.167.238.167 – 10.167.238.167	10.167.238.167
41	10.167.238.168/32	10.167.238.168 – 10.167.238.168	10.167.238.168
42	10.167.238.169/32	10.167.238.169 – 10.167.238.169	10.167.238.169
43	10.167.238.170/32	10.167.238.170 – 10.167.238.170	10.167.238.170
44	10.167.238.171/32	10.167.238.171 – 10.167.238.171	10.167.238.171
45	10.167.238.172/32	10.167.238.172 – 10.167.238.172	10.167.238.172
46	10.167.238.173/32	10.167.238.173 – 10.167.238.173	10.167.238.173
47	10.167.238.174/32	10.167.238.174 – 10.167.238.174	10.167.238.174
48	10.167.238.175/32	10.167.238.175 – 10.167.238.175	10.167.238.175
49	10.167.238.176/32	10.167.238.176 – 10.167.238.176	10.167.238.176
50	10.167.238.177/32	10.167.238.177 – 10.167.238.177	10.167.238.177
51	10.167.238.178/32	10.167.238.178 – 10.167.238.178	10.167.238.178
52	10.167.238.179/32	10.167.238.179 – 10.167.238.179	10.167.238.179
53	10.167.238.180/32	10.167.238.180 – 10.167.238.180	10.167.238.180
54	10.167.238.181/32	10.167.238.181 – 10.167.238.181	10.167.238.181
55	10.167.238.182/32	10.167.238.182 – 10.167.238.182	10.167.238.182
56	10.167.238.183/32	10.167.238.183 – 10.167.238.183	10.167.238.183
57	10.167.238.184/32	10.167.238.184 – 10.167.238.184	10.167.238.184
58	10.167.238.185/32	10.167.238.185 – 10.167.238.185	10.167.238.185
59	10.167.238.186/32	10.167.238.186 – 10.167.238.186	10.167.238.186
60	10.167.238.187/32	10.167.238.187 – 10.167.238.187	10.167.238.187
61	10.167.238.188/32	10.167.238.188 – 10.167.238.188	10.167.238.188
62	10.167.238.189/32	10.167.238.189 – 10.167.238.189	10.167.238.189
63	10.167.238.190/32	10.167.238.190 – 10.167.238.190	10.167.238.190
64	10.167.238.191/32	10.167.238.191 – 10.167.238.191	10.167.238.191
65	10.167.238.192/32	10.167.238.192 – 10.167.238.192	10.167.238.192
66	10.167.238.193/32	10.167.238.193 – 10.167.238.193	10.167.238.193
67	10.167.238.194/32	10.167.238.194 – 10.167.238.194	10.167.238.194
68	10.167.238.195/32	10.167.238.195 – 10.167.238.195	10.167.238.195
69	10.167.238.196/32	10.167.238.196 – 10.167.238.196	10.167.238.196
70	10.167.238.197/32	10.167.238.197 – 10.167.238.197	10.167.238.197
71	10.167.238.198/32	10.167.238.198 – 10.167.238.198	10.167.238.198
72	10.167.238.199/32	10.167.238.199 – 10.167.238.199	10.167.238.199
73	10.167.238.200/32	10.167.238.200 – 10.167.238.200	10.167.238.200
74	10.167.238.201/32	10.167.238.201 – 10.167.238.201	10.167.238.201
75	10.167.238.202/32	10.167.238.202 – 10.167.238.202	10.167.238.202
76	10.167.238.203/32	10.167.238.203 – 10.167.238.203	10.167.238.203
77	10.167.238.204/32	10.167.238.204 – 10.167.238.204	10.167.238.204
78	10.167.238.205/32	10.167.238.205 – 10.167.238.205	10.167.238.205
79	10.167.238.206/32	10.167.238.206 – 10.167.238.206	10.167.238.206
80	10.167.238.207/32	10.167.238.207 – 10.167.238.207	10.167.238.207
81	10.167.238.208/32	10.167.238.208 – 10.167.238.208	10.167.238.208
82	10.167.238.209/32	10.167.238.209 – 10.167.238.209	10.167.238.209
83	10.167.238.210/32	10.167.238.210 – 10.167.238.210	10.167.238.210
84	10.167.238.211/32	10.167.238.211 – 10.167.238.211	10.167.238.211
85	10.167.238.212/32	10.167.238.212 – 10.167.238.212	10.167.238.212
86	10.167.238.213/32	10.167.238.213 – 10.167.238.213	10.167.238.213
87	10.167.238.214/32	10.167.238.214 – 10.167.238.214	10.167.238.214
88	10.167.238.215/32	10.167.238.215 – 10.167.238.215	10.167.238.215
89	10.167.238.216/32	10.167.238.216 – 10.167.238.216	10.167.238.216
90	10.167.238.217/32	10.167.238.217 – 10.167.238.217	10.167.238.217
91	10.167.238.218/32	10.167.238.218 – 10.167.238.218	10.167.238.218
92	10.167.238.219/32	10.167.238.219 – 10.167.238.219	10.167.238.219
93	10.167.238.220/32	10.167.238.220 – 10.167.238.220	10.167.238.220
94	10.167.238.221/32	10.167.238.221 – 10.167.238.221	10.167.238.221
95	10.167.238.222/32	10.167.238.222 – 10.167.238.222	10.167.238.222
96	10.167.238.223/32	10.167.238.223 – 10.167.238.223	10.167.238.223
97	10.167.238.224/32	10.167.238.224 – 10.167.238.224	10.167.238.224
98	10.167.238.225/32	10.167.238.225 – 10.167.238.225	10.167.238.225
99	10.167.238.226/32	10.167.238.226 – 10.167.238.226	10.167.238.226
100	10.167.238.227/32	10.167.238.227 – 10.167.238.227	10.167.238.227
101	10.167.238.228/32	10.167.238.228 – 10.167.238.228	10.167.238.228
102	10.167.238.229/32	10.167.238.229 – 10.167.238.229	10.167.238.229
103	10.167.238.230/32	10.167.238.230 – 10.167.238.230	10.167.238.230
104	10.167.238.231/32	10.167.238.231 – 10.167.238.231	10.167.238.231
105	10.167.238.232/32	10.167.238.232 – 10.167.238.232	10.167.238.232
106	10.167.238.233/32	10.167.238.233 – 10.167.238.233	10.167.238.233
107	10.167.238.234/32	10.167.238.234 – 10.167.238.234	10.167.238.234
108	10.167.238.235/32	10.167.238.235 – 10.167.238.235	10.167.238.235
109	10.167.238.236/32	10.167.238.236 – 10.167.238.236	10.167.238.236
110	10.167.238.237/32	10.167.238.237 – 10.167.238.237	10.167.238.237
111	10.167.238.238/32	10.167.238.238 – 10.167.238.238	10.167.238.238
112	10.167.238.239/32	10.167.238.239 – 10.167.238.239	10.167.238.239
113	10.167.238.240/32	10.167.238.240 – 10.167.238.240	10.167.238.240
114	10.167.238.241/32	10.167.238.241 – 10.167.238.241	10.167.238.241
115	10.167.238.242/32	10.167.238.242 – 10.167.238.242	10.167.238.242
116	10.167.238.243/32	10.167.238.243 – 10.167.238.243	10.167.238.243
117	10.167.238.244/32	10.167.238.244 – 10.167.238.244	10.167.238.244
118	10.167.238.245/32	10.167.238.245 – 10.167.238.245	10.167.238.245
119	10.167.238.246/32	10.167.238.246 – 10.167.238.246	10.167.238.246
120	10.167.238.247/32	10.167.238.247 – 10.167.238.247	10.167.238.247
121	10.167.238.248/32	10.167.238.248 – 10.167.238.248	10.167.238.248
122	10.167.238.249/32	10.167.238.249 – 10.167.238.249	10.167.238.249
123	10.167.238.250/32	10.167.238.250 – 10.167.238.250	10.167.238.250
124	10.167.238.251/32	10.167.238.251 – 10.167.238.251	10.167.238.251
125	10.167.238.252/32	10.167.238.252 – 10.167.238.252	10.167.238.252
126	10.167.238.253/32	10.167.238.253 – 10.167.238.253	10.167.238.253
127	10.167.238.254/32	10.167.238.254 – 10.167.238.254	10.167.238.254
128	10.167.238.255/32	10.167.238.255 – 10.167.238.255	10.167.238.255

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 →