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)10.167.240.128/25

network10.167.240.128/25

broadcast10.167.240.255

first host10.167.240.129

last host10.167.240.254

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.167.240.128/25

address00001010.10100111.11110000.10000000

subnet mask11111111.11111111.11111111.10000000

network00001010.10100111.11110000.10000000

broadcast00001010.10100111.11110000.11111111

green = network part, grey = host part

hex0x0aa7f080

decimal178778240

reverse dns128.240.167.10.in-addr.arpa

ipv4-mapped::ffff:aa7:f080

/25 split into /32 · 128 subnets

close ×

#	network	host range	broadcast
1	10.167.240.128/32	10.167.240.128 – 10.167.240.128	10.167.240.128
2	10.167.240.129/32	10.167.240.129 – 10.167.240.129	10.167.240.129
3	10.167.240.130/32	10.167.240.130 – 10.167.240.130	10.167.240.130
4	10.167.240.131/32	10.167.240.131 – 10.167.240.131	10.167.240.131
5	10.167.240.132/32	10.167.240.132 – 10.167.240.132	10.167.240.132
6	10.167.240.133/32	10.167.240.133 – 10.167.240.133	10.167.240.133
7	10.167.240.134/32	10.167.240.134 – 10.167.240.134	10.167.240.134
8	10.167.240.135/32	10.167.240.135 – 10.167.240.135	10.167.240.135
9	10.167.240.136/32	10.167.240.136 – 10.167.240.136	10.167.240.136
10	10.167.240.137/32	10.167.240.137 – 10.167.240.137	10.167.240.137
11	10.167.240.138/32	10.167.240.138 – 10.167.240.138	10.167.240.138
12	10.167.240.139/32	10.167.240.139 – 10.167.240.139	10.167.240.139
13	10.167.240.140/32	10.167.240.140 – 10.167.240.140	10.167.240.140
14	10.167.240.141/32	10.167.240.141 – 10.167.240.141	10.167.240.141
15	10.167.240.142/32	10.167.240.142 – 10.167.240.142	10.167.240.142
16	10.167.240.143/32	10.167.240.143 – 10.167.240.143	10.167.240.143
17	10.167.240.144/32	10.167.240.144 – 10.167.240.144	10.167.240.144
18	10.167.240.145/32	10.167.240.145 – 10.167.240.145	10.167.240.145
19	10.167.240.146/32	10.167.240.146 – 10.167.240.146	10.167.240.146
20	10.167.240.147/32	10.167.240.147 – 10.167.240.147	10.167.240.147
21	10.167.240.148/32	10.167.240.148 – 10.167.240.148	10.167.240.148
22	10.167.240.149/32	10.167.240.149 – 10.167.240.149	10.167.240.149
23	10.167.240.150/32	10.167.240.150 – 10.167.240.150	10.167.240.150
24	10.167.240.151/32	10.167.240.151 – 10.167.240.151	10.167.240.151
25	10.167.240.152/32	10.167.240.152 – 10.167.240.152	10.167.240.152
26	10.167.240.153/32	10.167.240.153 – 10.167.240.153	10.167.240.153
27	10.167.240.154/32	10.167.240.154 – 10.167.240.154	10.167.240.154
28	10.167.240.155/32	10.167.240.155 – 10.167.240.155	10.167.240.155
29	10.167.240.156/32	10.167.240.156 – 10.167.240.156	10.167.240.156
30	10.167.240.157/32	10.167.240.157 – 10.167.240.157	10.167.240.157
31	10.167.240.158/32	10.167.240.158 – 10.167.240.158	10.167.240.158
32	10.167.240.159/32	10.167.240.159 – 10.167.240.159	10.167.240.159
33	10.167.240.160/32	10.167.240.160 – 10.167.240.160	10.167.240.160
34	10.167.240.161/32	10.167.240.161 – 10.167.240.161	10.167.240.161
35	10.167.240.162/32	10.167.240.162 – 10.167.240.162	10.167.240.162
36	10.167.240.163/32	10.167.240.163 – 10.167.240.163	10.167.240.163
37	10.167.240.164/32	10.167.240.164 – 10.167.240.164	10.167.240.164
38	10.167.240.165/32	10.167.240.165 – 10.167.240.165	10.167.240.165
39	10.167.240.166/32	10.167.240.166 – 10.167.240.166	10.167.240.166
40	10.167.240.167/32	10.167.240.167 – 10.167.240.167	10.167.240.167
41	10.167.240.168/32	10.167.240.168 – 10.167.240.168	10.167.240.168
42	10.167.240.169/32	10.167.240.169 – 10.167.240.169	10.167.240.169
43	10.167.240.170/32	10.167.240.170 – 10.167.240.170	10.167.240.170
44	10.167.240.171/32	10.167.240.171 – 10.167.240.171	10.167.240.171
45	10.167.240.172/32	10.167.240.172 – 10.167.240.172	10.167.240.172
46	10.167.240.173/32	10.167.240.173 – 10.167.240.173	10.167.240.173
47	10.167.240.174/32	10.167.240.174 – 10.167.240.174	10.167.240.174
48	10.167.240.175/32	10.167.240.175 – 10.167.240.175	10.167.240.175
49	10.167.240.176/32	10.167.240.176 – 10.167.240.176	10.167.240.176
50	10.167.240.177/32	10.167.240.177 – 10.167.240.177	10.167.240.177
51	10.167.240.178/32	10.167.240.178 – 10.167.240.178	10.167.240.178
52	10.167.240.179/32	10.167.240.179 – 10.167.240.179	10.167.240.179
53	10.167.240.180/32	10.167.240.180 – 10.167.240.180	10.167.240.180
54	10.167.240.181/32	10.167.240.181 – 10.167.240.181	10.167.240.181
55	10.167.240.182/32	10.167.240.182 – 10.167.240.182	10.167.240.182
56	10.167.240.183/32	10.167.240.183 – 10.167.240.183	10.167.240.183
57	10.167.240.184/32	10.167.240.184 – 10.167.240.184	10.167.240.184
58	10.167.240.185/32	10.167.240.185 – 10.167.240.185	10.167.240.185
59	10.167.240.186/32	10.167.240.186 – 10.167.240.186	10.167.240.186
60	10.167.240.187/32	10.167.240.187 – 10.167.240.187	10.167.240.187
61	10.167.240.188/32	10.167.240.188 – 10.167.240.188	10.167.240.188
62	10.167.240.189/32	10.167.240.189 – 10.167.240.189	10.167.240.189
63	10.167.240.190/32	10.167.240.190 – 10.167.240.190	10.167.240.190
64	10.167.240.191/32	10.167.240.191 – 10.167.240.191	10.167.240.191
65	10.167.240.192/32	10.167.240.192 – 10.167.240.192	10.167.240.192
66	10.167.240.193/32	10.167.240.193 – 10.167.240.193	10.167.240.193
67	10.167.240.194/32	10.167.240.194 – 10.167.240.194	10.167.240.194
68	10.167.240.195/32	10.167.240.195 – 10.167.240.195	10.167.240.195
69	10.167.240.196/32	10.167.240.196 – 10.167.240.196	10.167.240.196
70	10.167.240.197/32	10.167.240.197 – 10.167.240.197	10.167.240.197
71	10.167.240.198/32	10.167.240.198 – 10.167.240.198	10.167.240.198
72	10.167.240.199/32	10.167.240.199 – 10.167.240.199	10.167.240.199
73	10.167.240.200/32	10.167.240.200 – 10.167.240.200	10.167.240.200
74	10.167.240.201/32	10.167.240.201 – 10.167.240.201	10.167.240.201
75	10.167.240.202/32	10.167.240.202 – 10.167.240.202	10.167.240.202
76	10.167.240.203/32	10.167.240.203 – 10.167.240.203	10.167.240.203
77	10.167.240.204/32	10.167.240.204 – 10.167.240.204	10.167.240.204
78	10.167.240.205/32	10.167.240.205 – 10.167.240.205	10.167.240.205
79	10.167.240.206/32	10.167.240.206 – 10.167.240.206	10.167.240.206
80	10.167.240.207/32	10.167.240.207 – 10.167.240.207	10.167.240.207
81	10.167.240.208/32	10.167.240.208 – 10.167.240.208	10.167.240.208
82	10.167.240.209/32	10.167.240.209 – 10.167.240.209	10.167.240.209
83	10.167.240.210/32	10.167.240.210 – 10.167.240.210	10.167.240.210
84	10.167.240.211/32	10.167.240.211 – 10.167.240.211	10.167.240.211
85	10.167.240.212/32	10.167.240.212 – 10.167.240.212	10.167.240.212
86	10.167.240.213/32	10.167.240.213 – 10.167.240.213	10.167.240.213
87	10.167.240.214/32	10.167.240.214 – 10.167.240.214	10.167.240.214
88	10.167.240.215/32	10.167.240.215 – 10.167.240.215	10.167.240.215
89	10.167.240.216/32	10.167.240.216 – 10.167.240.216	10.167.240.216
90	10.167.240.217/32	10.167.240.217 – 10.167.240.217	10.167.240.217
91	10.167.240.218/32	10.167.240.218 – 10.167.240.218	10.167.240.218
92	10.167.240.219/32	10.167.240.219 – 10.167.240.219	10.167.240.219
93	10.167.240.220/32	10.167.240.220 – 10.167.240.220	10.167.240.220
94	10.167.240.221/32	10.167.240.221 – 10.167.240.221	10.167.240.221
95	10.167.240.222/32	10.167.240.222 – 10.167.240.222	10.167.240.222
96	10.167.240.223/32	10.167.240.223 – 10.167.240.223	10.167.240.223
97	10.167.240.224/32	10.167.240.224 – 10.167.240.224	10.167.240.224
98	10.167.240.225/32	10.167.240.225 – 10.167.240.225	10.167.240.225
99	10.167.240.226/32	10.167.240.226 – 10.167.240.226	10.167.240.226
100	10.167.240.227/32	10.167.240.227 – 10.167.240.227	10.167.240.227
101	10.167.240.228/32	10.167.240.228 – 10.167.240.228	10.167.240.228
102	10.167.240.229/32	10.167.240.229 – 10.167.240.229	10.167.240.229
103	10.167.240.230/32	10.167.240.230 – 10.167.240.230	10.167.240.230
104	10.167.240.231/32	10.167.240.231 – 10.167.240.231	10.167.240.231
105	10.167.240.232/32	10.167.240.232 – 10.167.240.232	10.167.240.232
106	10.167.240.233/32	10.167.240.233 – 10.167.240.233	10.167.240.233
107	10.167.240.234/32	10.167.240.234 – 10.167.240.234	10.167.240.234
108	10.167.240.235/32	10.167.240.235 – 10.167.240.235	10.167.240.235
109	10.167.240.236/32	10.167.240.236 – 10.167.240.236	10.167.240.236
110	10.167.240.237/32	10.167.240.237 – 10.167.240.237	10.167.240.237
111	10.167.240.238/32	10.167.240.238 – 10.167.240.238	10.167.240.238
112	10.167.240.239/32	10.167.240.239 – 10.167.240.239	10.167.240.239
113	10.167.240.240/32	10.167.240.240 – 10.167.240.240	10.167.240.240
114	10.167.240.241/32	10.167.240.241 – 10.167.240.241	10.167.240.241
115	10.167.240.242/32	10.167.240.242 – 10.167.240.242	10.167.240.242
116	10.167.240.243/32	10.167.240.243 – 10.167.240.243	10.167.240.243
117	10.167.240.244/32	10.167.240.244 – 10.167.240.244	10.167.240.244
118	10.167.240.245/32	10.167.240.245 – 10.167.240.245	10.167.240.245
119	10.167.240.246/32	10.167.240.246 – 10.167.240.246	10.167.240.246
120	10.167.240.247/32	10.167.240.247 – 10.167.240.247	10.167.240.247
121	10.167.240.248/32	10.167.240.248 – 10.167.240.248	10.167.240.248
122	10.167.240.249/32	10.167.240.249 – 10.167.240.249	10.167.240.249
123	10.167.240.250/32	10.167.240.250 – 10.167.240.250	10.167.240.250
124	10.167.240.251/32	10.167.240.251 – 10.167.240.251	10.167.240.251
125	10.167.240.252/32	10.167.240.252 – 10.167.240.252	10.167.240.252
126	10.167.240.253/32	10.167.240.253 – 10.167.240.253	10.167.240.253
127	10.167.240.254/32	10.167.240.254 – 10.167.240.254	10.167.240.254
128	10.167.240.255/32	10.167.240.255 – 10.167.240.255	10.167.240.255

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 →