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)10.167.56.128/25

network10.167.56.128/25

broadcast10.167.56.255

first host10.167.56.129

last host10.167.56.254

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.167.56.128/25

address00001010.10100111.00111000.10000000

subnet mask11111111.11111111.11111111.10000000

network00001010.10100111.00111000.10000000

broadcast00001010.10100111.00111000.11111111

green = network part, grey = host part

hex0x0aa73880

decimal178731136

reverse dns128.56.167.10.in-addr.arpa

ipv4-mapped::ffff:aa7:3880

/25 split into /32 · 128 subnets

close ×

#	network	host range	broadcast
1	10.167.56.128/32	10.167.56.128 – 10.167.56.128	10.167.56.128
2	10.167.56.129/32	10.167.56.129 – 10.167.56.129	10.167.56.129
3	10.167.56.130/32	10.167.56.130 – 10.167.56.130	10.167.56.130
4	10.167.56.131/32	10.167.56.131 – 10.167.56.131	10.167.56.131
5	10.167.56.132/32	10.167.56.132 – 10.167.56.132	10.167.56.132
6	10.167.56.133/32	10.167.56.133 – 10.167.56.133	10.167.56.133
7	10.167.56.134/32	10.167.56.134 – 10.167.56.134	10.167.56.134
8	10.167.56.135/32	10.167.56.135 – 10.167.56.135	10.167.56.135
9	10.167.56.136/32	10.167.56.136 – 10.167.56.136	10.167.56.136
10	10.167.56.137/32	10.167.56.137 – 10.167.56.137	10.167.56.137
11	10.167.56.138/32	10.167.56.138 – 10.167.56.138	10.167.56.138
12	10.167.56.139/32	10.167.56.139 – 10.167.56.139	10.167.56.139
13	10.167.56.140/32	10.167.56.140 – 10.167.56.140	10.167.56.140
14	10.167.56.141/32	10.167.56.141 – 10.167.56.141	10.167.56.141
15	10.167.56.142/32	10.167.56.142 – 10.167.56.142	10.167.56.142
16	10.167.56.143/32	10.167.56.143 – 10.167.56.143	10.167.56.143
17	10.167.56.144/32	10.167.56.144 – 10.167.56.144	10.167.56.144
18	10.167.56.145/32	10.167.56.145 – 10.167.56.145	10.167.56.145
19	10.167.56.146/32	10.167.56.146 – 10.167.56.146	10.167.56.146
20	10.167.56.147/32	10.167.56.147 – 10.167.56.147	10.167.56.147
21	10.167.56.148/32	10.167.56.148 – 10.167.56.148	10.167.56.148
22	10.167.56.149/32	10.167.56.149 – 10.167.56.149	10.167.56.149
23	10.167.56.150/32	10.167.56.150 – 10.167.56.150	10.167.56.150
24	10.167.56.151/32	10.167.56.151 – 10.167.56.151	10.167.56.151
25	10.167.56.152/32	10.167.56.152 – 10.167.56.152	10.167.56.152
26	10.167.56.153/32	10.167.56.153 – 10.167.56.153	10.167.56.153
27	10.167.56.154/32	10.167.56.154 – 10.167.56.154	10.167.56.154
28	10.167.56.155/32	10.167.56.155 – 10.167.56.155	10.167.56.155
29	10.167.56.156/32	10.167.56.156 – 10.167.56.156	10.167.56.156
30	10.167.56.157/32	10.167.56.157 – 10.167.56.157	10.167.56.157
31	10.167.56.158/32	10.167.56.158 – 10.167.56.158	10.167.56.158
32	10.167.56.159/32	10.167.56.159 – 10.167.56.159	10.167.56.159
33	10.167.56.160/32	10.167.56.160 – 10.167.56.160	10.167.56.160
34	10.167.56.161/32	10.167.56.161 – 10.167.56.161	10.167.56.161
35	10.167.56.162/32	10.167.56.162 – 10.167.56.162	10.167.56.162
36	10.167.56.163/32	10.167.56.163 – 10.167.56.163	10.167.56.163
37	10.167.56.164/32	10.167.56.164 – 10.167.56.164	10.167.56.164
38	10.167.56.165/32	10.167.56.165 – 10.167.56.165	10.167.56.165
39	10.167.56.166/32	10.167.56.166 – 10.167.56.166	10.167.56.166
40	10.167.56.167/32	10.167.56.167 – 10.167.56.167	10.167.56.167
41	10.167.56.168/32	10.167.56.168 – 10.167.56.168	10.167.56.168
42	10.167.56.169/32	10.167.56.169 – 10.167.56.169	10.167.56.169
43	10.167.56.170/32	10.167.56.170 – 10.167.56.170	10.167.56.170
44	10.167.56.171/32	10.167.56.171 – 10.167.56.171	10.167.56.171
45	10.167.56.172/32	10.167.56.172 – 10.167.56.172	10.167.56.172
46	10.167.56.173/32	10.167.56.173 – 10.167.56.173	10.167.56.173
47	10.167.56.174/32	10.167.56.174 – 10.167.56.174	10.167.56.174
48	10.167.56.175/32	10.167.56.175 – 10.167.56.175	10.167.56.175
49	10.167.56.176/32	10.167.56.176 – 10.167.56.176	10.167.56.176
50	10.167.56.177/32	10.167.56.177 – 10.167.56.177	10.167.56.177
51	10.167.56.178/32	10.167.56.178 – 10.167.56.178	10.167.56.178
52	10.167.56.179/32	10.167.56.179 – 10.167.56.179	10.167.56.179
53	10.167.56.180/32	10.167.56.180 – 10.167.56.180	10.167.56.180
54	10.167.56.181/32	10.167.56.181 – 10.167.56.181	10.167.56.181
55	10.167.56.182/32	10.167.56.182 – 10.167.56.182	10.167.56.182
56	10.167.56.183/32	10.167.56.183 – 10.167.56.183	10.167.56.183
57	10.167.56.184/32	10.167.56.184 – 10.167.56.184	10.167.56.184
58	10.167.56.185/32	10.167.56.185 – 10.167.56.185	10.167.56.185
59	10.167.56.186/32	10.167.56.186 – 10.167.56.186	10.167.56.186
60	10.167.56.187/32	10.167.56.187 – 10.167.56.187	10.167.56.187
61	10.167.56.188/32	10.167.56.188 – 10.167.56.188	10.167.56.188
62	10.167.56.189/32	10.167.56.189 – 10.167.56.189	10.167.56.189
63	10.167.56.190/32	10.167.56.190 – 10.167.56.190	10.167.56.190
64	10.167.56.191/32	10.167.56.191 – 10.167.56.191	10.167.56.191
65	10.167.56.192/32	10.167.56.192 – 10.167.56.192	10.167.56.192
66	10.167.56.193/32	10.167.56.193 – 10.167.56.193	10.167.56.193
67	10.167.56.194/32	10.167.56.194 – 10.167.56.194	10.167.56.194
68	10.167.56.195/32	10.167.56.195 – 10.167.56.195	10.167.56.195
69	10.167.56.196/32	10.167.56.196 – 10.167.56.196	10.167.56.196
70	10.167.56.197/32	10.167.56.197 – 10.167.56.197	10.167.56.197
71	10.167.56.198/32	10.167.56.198 – 10.167.56.198	10.167.56.198
72	10.167.56.199/32	10.167.56.199 – 10.167.56.199	10.167.56.199
73	10.167.56.200/32	10.167.56.200 – 10.167.56.200	10.167.56.200
74	10.167.56.201/32	10.167.56.201 – 10.167.56.201	10.167.56.201
75	10.167.56.202/32	10.167.56.202 – 10.167.56.202	10.167.56.202
76	10.167.56.203/32	10.167.56.203 – 10.167.56.203	10.167.56.203
77	10.167.56.204/32	10.167.56.204 – 10.167.56.204	10.167.56.204
78	10.167.56.205/32	10.167.56.205 – 10.167.56.205	10.167.56.205
79	10.167.56.206/32	10.167.56.206 – 10.167.56.206	10.167.56.206
80	10.167.56.207/32	10.167.56.207 – 10.167.56.207	10.167.56.207
81	10.167.56.208/32	10.167.56.208 – 10.167.56.208	10.167.56.208
82	10.167.56.209/32	10.167.56.209 – 10.167.56.209	10.167.56.209
83	10.167.56.210/32	10.167.56.210 – 10.167.56.210	10.167.56.210
84	10.167.56.211/32	10.167.56.211 – 10.167.56.211	10.167.56.211
85	10.167.56.212/32	10.167.56.212 – 10.167.56.212	10.167.56.212
86	10.167.56.213/32	10.167.56.213 – 10.167.56.213	10.167.56.213
87	10.167.56.214/32	10.167.56.214 – 10.167.56.214	10.167.56.214
88	10.167.56.215/32	10.167.56.215 – 10.167.56.215	10.167.56.215
89	10.167.56.216/32	10.167.56.216 – 10.167.56.216	10.167.56.216
90	10.167.56.217/32	10.167.56.217 – 10.167.56.217	10.167.56.217
91	10.167.56.218/32	10.167.56.218 – 10.167.56.218	10.167.56.218
92	10.167.56.219/32	10.167.56.219 – 10.167.56.219	10.167.56.219
93	10.167.56.220/32	10.167.56.220 – 10.167.56.220	10.167.56.220
94	10.167.56.221/32	10.167.56.221 – 10.167.56.221	10.167.56.221
95	10.167.56.222/32	10.167.56.222 – 10.167.56.222	10.167.56.222
96	10.167.56.223/32	10.167.56.223 – 10.167.56.223	10.167.56.223
97	10.167.56.224/32	10.167.56.224 – 10.167.56.224	10.167.56.224
98	10.167.56.225/32	10.167.56.225 – 10.167.56.225	10.167.56.225
99	10.167.56.226/32	10.167.56.226 – 10.167.56.226	10.167.56.226
100	10.167.56.227/32	10.167.56.227 – 10.167.56.227	10.167.56.227
101	10.167.56.228/32	10.167.56.228 – 10.167.56.228	10.167.56.228
102	10.167.56.229/32	10.167.56.229 – 10.167.56.229	10.167.56.229
103	10.167.56.230/32	10.167.56.230 – 10.167.56.230	10.167.56.230
104	10.167.56.231/32	10.167.56.231 – 10.167.56.231	10.167.56.231
105	10.167.56.232/32	10.167.56.232 – 10.167.56.232	10.167.56.232
106	10.167.56.233/32	10.167.56.233 – 10.167.56.233	10.167.56.233
107	10.167.56.234/32	10.167.56.234 – 10.167.56.234	10.167.56.234
108	10.167.56.235/32	10.167.56.235 – 10.167.56.235	10.167.56.235
109	10.167.56.236/32	10.167.56.236 – 10.167.56.236	10.167.56.236
110	10.167.56.237/32	10.167.56.237 – 10.167.56.237	10.167.56.237
111	10.167.56.238/32	10.167.56.238 – 10.167.56.238	10.167.56.238
112	10.167.56.239/32	10.167.56.239 – 10.167.56.239	10.167.56.239
113	10.167.56.240/32	10.167.56.240 – 10.167.56.240	10.167.56.240
114	10.167.56.241/32	10.167.56.241 – 10.167.56.241	10.167.56.241
115	10.167.56.242/32	10.167.56.242 – 10.167.56.242	10.167.56.242
116	10.167.56.243/32	10.167.56.243 – 10.167.56.243	10.167.56.243
117	10.167.56.244/32	10.167.56.244 – 10.167.56.244	10.167.56.244
118	10.167.56.245/32	10.167.56.245 – 10.167.56.245	10.167.56.245
119	10.167.56.246/32	10.167.56.246 – 10.167.56.246	10.167.56.246
120	10.167.56.247/32	10.167.56.247 – 10.167.56.247	10.167.56.247
121	10.167.56.248/32	10.167.56.248 – 10.167.56.248	10.167.56.248
122	10.167.56.249/32	10.167.56.249 – 10.167.56.249	10.167.56.249
123	10.167.56.250/32	10.167.56.250 – 10.167.56.250	10.167.56.250
124	10.167.56.251/32	10.167.56.251 – 10.167.56.251	10.167.56.251
125	10.167.56.252/32	10.167.56.252 – 10.167.56.252	10.167.56.252
126	10.167.56.253/32	10.167.56.253 – 10.167.56.253	10.167.56.253
127	10.167.56.254/32	10.167.56.254 – 10.167.56.254	10.167.56.254
128	10.167.56.255/32	10.167.56.255 – 10.167.56.255	10.167.56.255

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 →