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)10.167.104.128/25

network10.167.104.128/25

broadcast10.167.104.255

first host10.167.104.129

last host10.167.104.254

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.167.104.128/25

address00001010.10100111.01101000.10000000

subnet mask11111111.11111111.11111111.10000000

network00001010.10100111.01101000.10000000

broadcast00001010.10100111.01101000.11111111

green = network part, grey = host part

hex0x0aa76880

decimal178743424

reverse dns128.104.167.10.in-addr.arpa

ipv4-mapped::ffff:aa7:6880

/25 split into /32 · 128 subnets

close ×

#	network	host range	broadcast
1	10.167.104.128/32	10.167.104.128 – 10.167.104.128	10.167.104.128
2	10.167.104.129/32	10.167.104.129 – 10.167.104.129	10.167.104.129
3	10.167.104.130/32	10.167.104.130 – 10.167.104.130	10.167.104.130
4	10.167.104.131/32	10.167.104.131 – 10.167.104.131	10.167.104.131
5	10.167.104.132/32	10.167.104.132 – 10.167.104.132	10.167.104.132
6	10.167.104.133/32	10.167.104.133 – 10.167.104.133	10.167.104.133
7	10.167.104.134/32	10.167.104.134 – 10.167.104.134	10.167.104.134
8	10.167.104.135/32	10.167.104.135 – 10.167.104.135	10.167.104.135
9	10.167.104.136/32	10.167.104.136 – 10.167.104.136	10.167.104.136
10	10.167.104.137/32	10.167.104.137 – 10.167.104.137	10.167.104.137
11	10.167.104.138/32	10.167.104.138 – 10.167.104.138	10.167.104.138
12	10.167.104.139/32	10.167.104.139 – 10.167.104.139	10.167.104.139
13	10.167.104.140/32	10.167.104.140 – 10.167.104.140	10.167.104.140
14	10.167.104.141/32	10.167.104.141 – 10.167.104.141	10.167.104.141
15	10.167.104.142/32	10.167.104.142 – 10.167.104.142	10.167.104.142
16	10.167.104.143/32	10.167.104.143 – 10.167.104.143	10.167.104.143
17	10.167.104.144/32	10.167.104.144 – 10.167.104.144	10.167.104.144
18	10.167.104.145/32	10.167.104.145 – 10.167.104.145	10.167.104.145
19	10.167.104.146/32	10.167.104.146 – 10.167.104.146	10.167.104.146
20	10.167.104.147/32	10.167.104.147 – 10.167.104.147	10.167.104.147
21	10.167.104.148/32	10.167.104.148 – 10.167.104.148	10.167.104.148
22	10.167.104.149/32	10.167.104.149 – 10.167.104.149	10.167.104.149
23	10.167.104.150/32	10.167.104.150 – 10.167.104.150	10.167.104.150
24	10.167.104.151/32	10.167.104.151 – 10.167.104.151	10.167.104.151
25	10.167.104.152/32	10.167.104.152 – 10.167.104.152	10.167.104.152
26	10.167.104.153/32	10.167.104.153 – 10.167.104.153	10.167.104.153
27	10.167.104.154/32	10.167.104.154 – 10.167.104.154	10.167.104.154
28	10.167.104.155/32	10.167.104.155 – 10.167.104.155	10.167.104.155
29	10.167.104.156/32	10.167.104.156 – 10.167.104.156	10.167.104.156
30	10.167.104.157/32	10.167.104.157 – 10.167.104.157	10.167.104.157
31	10.167.104.158/32	10.167.104.158 – 10.167.104.158	10.167.104.158
32	10.167.104.159/32	10.167.104.159 – 10.167.104.159	10.167.104.159
33	10.167.104.160/32	10.167.104.160 – 10.167.104.160	10.167.104.160
34	10.167.104.161/32	10.167.104.161 – 10.167.104.161	10.167.104.161
35	10.167.104.162/32	10.167.104.162 – 10.167.104.162	10.167.104.162
36	10.167.104.163/32	10.167.104.163 – 10.167.104.163	10.167.104.163
37	10.167.104.164/32	10.167.104.164 – 10.167.104.164	10.167.104.164
38	10.167.104.165/32	10.167.104.165 – 10.167.104.165	10.167.104.165
39	10.167.104.166/32	10.167.104.166 – 10.167.104.166	10.167.104.166
40	10.167.104.167/32	10.167.104.167 – 10.167.104.167	10.167.104.167
41	10.167.104.168/32	10.167.104.168 – 10.167.104.168	10.167.104.168
42	10.167.104.169/32	10.167.104.169 – 10.167.104.169	10.167.104.169
43	10.167.104.170/32	10.167.104.170 – 10.167.104.170	10.167.104.170
44	10.167.104.171/32	10.167.104.171 – 10.167.104.171	10.167.104.171
45	10.167.104.172/32	10.167.104.172 – 10.167.104.172	10.167.104.172
46	10.167.104.173/32	10.167.104.173 – 10.167.104.173	10.167.104.173
47	10.167.104.174/32	10.167.104.174 – 10.167.104.174	10.167.104.174
48	10.167.104.175/32	10.167.104.175 – 10.167.104.175	10.167.104.175
49	10.167.104.176/32	10.167.104.176 – 10.167.104.176	10.167.104.176
50	10.167.104.177/32	10.167.104.177 – 10.167.104.177	10.167.104.177
51	10.167.104.178/32	10.167.104.178 – 10.167.104.178	10.167.104.178
52	10.167.104.179/32	10.167.104.179 – 10.167.104.179	10.167.104.179
53	10.167.104.180/32	10.167.104.180 – 10.167.104.180	10.167.104.180
54	10.167.104.181/32	10.167.104.181 – 10.167.104.181	10.167.104.181
55	10.167.104.182/32	10.167.104.182 – 10.167.104.182	10.167.104.182
56	10.167.104.183/32	10.167.104.183 – 10.167.104.183	10.167.104.183
57	10.167.104.184/32	10.167.104.184 – 10.167.104.184	10.167.104.184
58	10.167.104.185/32	10.167.104.185 – 10.167.104.185	10.167.104.185
59	10.167.104.186/32	10.167.104.186 – 10.167.104.186	10.167.104.186
60	10.167.104.187/32	10.167.104.187 – 10.167.104.187	10.167.104.187
61	10.167.104.188/32	10.167.104.188 – 10.167.104.188	10.167.104.188
62	10.167.104.189/32	10.167.104.189 – 10.167.104.189	10.167.104.189
63	10.167.104.190/32	10.167.104.190 – 10.167.104.190	10.167.104.190
64	10.167.104.191/32	10.167.104.191 – 10.167.104.191	10.167.104.191
65	10.167.104.192/32	10.167.104.192 – 10.167.104.192	10.167.104.192
66	10.167.104.193/32	10.167.104.193 – 10.167.104.193	10.167.104.193
67	10.167.104.194/32	10.167.104.194 – 10.167.104.194	10.167.104.194
68	10.167.104.195/32	10.167.104.195 – 10.167.104.195	10.167.104.195
69	10.167.104.196/32	10.167.104.196 – 10.167.104.196	10.167.104.196
70	10.167.104.197/32	10.167.104.197 – 10.167.104.197	10.167.104.197
71	10.167.104.198/32	10.167.104.198 – 10.167.104.198	10.167.104.198
72	10.167.104.199/32	10.167.104.199 – 10.167.104.199	10.167.104.199
73	10.167.104.200/32	10.167.104.200 – 10.167.104.200	10.167.104.200
74	10.167.104.201/32	10.167.104.201 – 10.167.104.201	10.167.104.201
75	10.167.104.202/32	10.167.104.202 – 10.167.104.202	10.167.104.202
76	10.167.104.203/32	10.167.104.203 – 10.167.104.203	10.167.104.203
77	10.167.104.204/32	10.167.104.204 – 10.167.104.204	10.167.104.204
78	10.167.104.205/32	10.167.104.205 – 10.167.104.205	10.167.104.205
79	10.167.104.206/32	10.167.104.206 – 10.167.104.206	10.167.104.206
80	10.167.104.207/32	10.167.104.207 – 10.167.104.207	10.167.104.207
81	10.167.104.208/32	10.167.104.208 – 10.167.104.208	10.167.104.208
82	10.167.104.209/32	10.167.104.209 – 10.167.104.209	10.167.104.209
83	10.167.104.210/32	10.167.104.210 – 10.167.104.210	10.167.104.210
84	10.167.104.211/32	10.167.104.211 – 10.167.104.211	10.167.104.211
85	10.167.104.212/32	10.167.104.212 – 10.167.104.212	10.167.104.212
86	10.167.104.213/32	10.167.104.213 – 10.167.104.213	10.167.104.213
87	10.167.104.214/32	10.167.104.214 – 10.167.104.214	10.167.104.214
88	10.167.104.215/32	10.167.104.215 – 10.167.104.215	10.167.104.215
89	10.167.104.216/32	10.167.104.216 – 10.167.104.216	10.167.104.216
90	10.167.104.217/32	10.167.104.217 – 10.167.104.217	10.167.104.217
91	10.167.104.218/32	10.167.104.218 – 10.167.104.218	10.167.104.218
92	10.167.104.219/32	10.167.104.219 – 10.167.104.219	10.167.104.219
93	10.167.104.220/32	10.167.104.220 – 10.167.104.220	10.167.104.220
94	10.167.104.221/32	10.167.104.221 – 10.167.104.221	10.167.104.221
95	10.167.104.222/32	10.167.104.222 – 10.167.104.222	10.167.104.222
96	10.167.104.223/32	10.167.104.223 – 10.167.104.223	10.167.104.223
97	10.167.104.224/32	10.167.104.224 – 10.167.104.224	10.167.104.224
98	10.167.104.225/32	10.167.104.225 – 10.167.104.225	10.167.104.225
99	10.167.104.226/32	10.167.104.226 – 10.167.104.226	10.167.104.226
100	10.167.104.227/32	10.167.104.227 – 10.167.104.227	10.167.104.227
101	10.167.104.228/32	10.167.104.228 – 10.167.104.228	10.167.104.228
102	10.167.104.229/32	10.167.104.229 – 10.167.104.229	10.167.104.229
103	10.167.104.230/32	10.167.104.230 – 10.167.104.230	10.167.104.230
104	10.167.104.231/32	10.167.104.231 – 10.167.104.231	10.167.104.231
105	10.167.104.232/32	10.167.104.232 – 10.167.104.232	10.167.104.232
106	10.167.104.233/32	10.167.104.233 – 10.167.104.233	10.167.104.233
107	10.167.104.234/32	10.167.104.234 – 10.167.104.234	10.167.104.234
108	10.167.104.235/32	10.167.104.235 – 10.167.104.235	10.167.104.235
109	10.167.104.236/32	10.167.104.236 – 10.167.104.236	10.167.104.236
110	10.167.104.237/32	10.167.104.237 – 10.167.104.237	10.167.104.237
111	10.167.104.238/32	10.167.104.238 – 10.167.104.238	10.167.104.238
112	10.167.104.239/32	10.167.104.239 – 10.167.104.239	10.167.104.239
113	10.167.104.240/32	10.167.104.240 – 10.167.104.240	10.167.104.240
114	10.167.104.241/32	10.167.104.241 – 10.167.104.241	10.167.104.241
115	10.167.104.242/32	10.167.104.242 – 10.167.104.242	10.167.104.242
116	10.167.104.243/32	10.167.104.243 – 10.167.104.243	10.167.104.243
117	10.167.104.244/32	10.167.104.244 – 10.167.104.244	10.167.104.244
118	10.167.104.245/32	10.167.104.245 – 10.167.104.245	10.167.104.245
119	10.167.104.246/32	10.167.104.246 – 10.167.104.246	10.167.104.246
120	10.167.104.247/32	10.167.104.247 – 10.167.104.247	10.167.104.247
121	10.167.104.248/32	10.167.104.248 – 10.167.104.248	10.167.104.248
122	10.167.104.249/32	10.167.104.249 – 10.167.104.249	10.167.104.249
123	10.167.104.250/32	10.167.104.250 – 10.167.104.250	10.167.104.250
124	10.167.104.251/32	10.167.104.251 – 10.167.104.251	10.167.104.251
125	10.167.104.252/32	10.167.104.252 – 10.167.104.252	10.167.104.252
126	10.167.104.253/32	10.167.104.253 – 10.167.104.253	10.167.104.253
127	10.167.104.254/32	10.167.104.254 – 10.167.104.254	10.167.104.254
128	10.167.104.255/32	10.167.104.255 – 10.167.104.255	10.167.104.255

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 →