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)10.167.73.128/25

network10.167.73.128/25

broadcast10.167.73.255

first host10.167.73.129

last host10.167.73.254

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.167.73.128/25

address00001010.10100111.01001001.10000000

subnet mask11111111.11111111.11111111.10000000

network00001010.10100111.01001001.10000000

broadcast00001010.10100111.01001001.11111111

green = network part, grey = host part

hex0x0aa74980

decimal178735488

reverse dns128.73.167.10.in-addr.arpa

ipv4-mapped::ffff:aa7:4980

/25 split into /32 · 128 subnets

close ×

#	network	host range	broadcast
1	10.167.73.128/32	10.167.73.128 – 10.167.73.128	10.167.73.128
2	10.167.73.129/32	10.167.73.129 – 10.167.73.129	10.167.73.129
3	10.167.73.130/32	10.167.73.130 – 10.167.73.130	10.167.73.130
4	10.167.73.131/32	10.167.73.131 – 10.167.73.131	10.167.73.131
5	10.167.73.132/32	10.167.73.132 – 10.167.73.132	10.167.73.132
6	10.167.73.133/32	10.167.73.133 – 10.167.73.133	10.167.73.133
7	10.167.73.134/32	10.167.73.134 – 10.167.73.134	10.167.73.134
8	10.167.73.135/32	10.167.73.135 – 10.167.73.135	10.167.73.135
9	10.167.73.136/32	10.167.73.136 – 10.167.73.136	10.167.73.136
10	10.167.73.137/32	10.167.73.137 – 10.167.73.137	10.167.73.137
11	10.167.73.138/32	10.167.73.138 – 10.167.73.138	10.167.73.138
12	10.167.73.139/32	10.167.73.139 – 10.167.73.139	10.167.73.139
13	10.167.73.140/32	10.167.73.140 – 10.167.73.140	10.167.73.140
14	10.167.73.141/32	10.167.73.141 – 10.167.73.141	10.167.73.141
15	10.167.73.142/32	10.167.73.142 – 10.167.73.142	10.167.73.142
16	10.167.73.143/32	10.167.73.143 – 10.167.73.143	10.167.73.143
17	10.167.73.144/32	10.167.73.144 – 10.167.73.144	10.167.73.144
18	10.167.73.145/32	10.167.73.145 – 10.167.73.145	10.167.73.145
19	10.167.73.146/32	10.167.73.146 – 10.167.73.146	10.167.73.146
20	10.167.73.147/32	10.167.73.147 – 10.167.73.147	10.167.73.147
21	10.167.73.148/32	10.167.73.148 – 10.167.73.148	10.167.73.148
22	10.167.73.149/32	10.167.73.149 – 10.167.73.149	10.167.73.149
23	10.167.73.150/32	10.167.73.150 – 10.167.73.150	10.167.73.150
24	10.167.73.151/32	10.167.73.151 – 10.167.73.151	10.167.73.151
25	10.167.73.152/32	10.167.73.152 – 10.167.73.152	10.167.73.152
26	10.167.73.153/32	10.167.73.153 – 10.167.73.153	10.167.73.153
27	10.167.73.154/32	10.167.73.154 – 10.167.73.154	10.167.73.154
28	10.167.73.155/32	10.167.73.155 – 10.167.73.155	10.167.73.155
29	10.167.73.156/32	10.167.73.156 – 10.167.73.156	10.167.73.156
30	10.167.73.157/32	10.167.73.157 – 10.167.73.157	10.167.73.157
31	10.167.73.158/32	10.167.73.158 – 10.167.73.158	10.167.73.158
32	10.167.73.159/32	10.167.73.159 – 10.167.73.159	10.167.73.159
33	10.167.73.160/32	10.167.73.160 – 10.167.73.160	10.167.73.160
34	10.167.73.161/32	10.167.73.161 – 10.167.73.161	10.167.73.161
35	10.167.73.162/32	10.167.73.162 – 10.167.73.162	10.167.73.162
36	10.167.73.163/32	10.167.73.163 – 10.167.73.163	10.167.73.163
37	10.167.73.164/32	10.167.73.164 – 10.167.73.164	10.167.73.164
38	10.167.73.165/32	10.167.73.165 – 10.167.73.165	10.167.73.165
39	10.167.73.166/32	10.167.73.166 – 10.167.73.166	10.167.73.166
40	10.167.73.167/32	10.167.73.167 – 10.167.73.167	10.167.73.167
41	10.167.73.168/32	10.167.73.168 – 10.167.73.168	10.167.73.168
42	10.167.73.169/32	10.167.73.169 – 10.167.73.169	10.167.73.169
43	10.167.73.170/32	10.167.73.170 – 10.167.73.170	10.167.73.170
44	10.167.73.171/32	10.167.73.171 – 10.167.73.171	10.167.73.171
45	10.167.73.172/32	10.167.73.172 – 10.167.73.172	10.167.73.172
46	10.167.73.173/32	10.167.73.173 – 10.167.73.173	10.167.73.173
47	10.167.73.174/32	10.167.73.174 – 10.167.73.174	10.167.73.174
48	10.167.73.175/32	10.167.73.175 – 10.167.73.175	10.167.73.175
49	10.167.73.176/32	10.167.73.176 – 10.167.73.176	10.167.73.176
50	10.167.73.177/32	10.167.73.177 – 10.167.73.177	10.167.73.177
51	10.167.73.178/32	10.167.73.178 – 10.167.73.178	10.167.73.178
52	10.167.73.179/32	10.167.73.179 – 10.167.73.179	10.167.73.179
53	10.167.73.180/32	10.167.73.180 – 10.167.73.180	10.167.73.180
54	10.167.73.181/32	10.167.73.181 – 10.167.73.181	10.167.73.181
55	10.167.73.182/32	10.167.73.182 – 10.167.73.182	10.167.73.182
56	10.167.73.183/32	10.167.73.183 – 10.167.73.183	10.167.73.183
57	10.167.73.184/32	10.167.73.184 – 10.167.73.184	10.167.73.184
58	10.167.73.185/32	10.167.73.185 – 10.167.73.185	10.167.73.185
59	10.167.73.186/32	10.167.73.186 – 10.167.73.186	10.167.73.186
60	10.167.73.187/32	10.167.73.187 – 10.167.73.187	10.167.73.187
61	10.167.73.188/32	10.167.73.188 – 10.167.73.188	10.167.73.188
62	10.167.73.189/32	10.167.73.189 – 10.167.73.189	10.167.73.189
63	10.167.73.190/32	10.167.73.190 – 10.167.73.190	10.167.73.190
64	10.167.73.191/32	10.167.73.191 – 10.167.73.191	10.167.73.191
65	10.167.73.192/32	10.167.73.192 – 10.167.73.192	10.167.73.192
66	10.167.73.193/32	10.167.73.193 – 10.167.73.193	10.167.73.193
67	10.167.73.194/32	10.167.73.194 – 10.167.73.194	10.167.73.194
68	10.167.73.195/32	10.167.73.195 – 10.167.73.195	10.167.73.195
69	10.167.73.196/32	10.167.73.196 – 10.167.73.196	10.167.73.196
70	10.167.73.197/32	10.167.73.197 – 10.167.73.197	10.167.73.197
71	10.167.73.198/32	10.167.73.198 – 10.167.73.198	10.167.73.198
72	10.167.73.199/32	10.167.73.199 – 10.167.73.199	10.167.73.199
73	10.167.73.200/32	10.167.73.200 – 10.167.73.200	10.167.73.200
74	10.167.73.201/32	10.167.73.201 – 10.167.73.201	10.167.73.201
75	10.167.73.202/32	10.167.73.202 – 10.167.73.202	10.167.73.202
76	10.167.73.203/32	10.167.73.203 – 10.167.73.203	10.167.73.203
77	10.167.73.204/32	10.167.73.204 – 10.167.73.204	10.167.73.204
78	10.167.73.205/32	10.167.73.205 – 10.167.73.205	10.167.73.205
79	10.167.73.206/32	10.167.73.206 – 10.167.73.206	10.167.73.206
80	10.167.73.207/32	10.167.73.207 – 10.167.73.207	10.167.73.207
81	10.167.73.208/32	10.167.73.208 – 10.167.73.208	10.167.73.208
82	10.167.73.209/32	10.167.73.209 – 10.167.73.209	10.167.73.209
83	10.167.73.210/32	10.167.73.210 – 10.167.73.210	10.167.73.210
84	10.167.73.211/32	10.167.73.211 – 10.167.73.211	10.167.73.211
85	10.167.73.212/32	10.167.73.212 – 10.167.73.212	10.167.73.212
86	10.167.73.213/32	10.167.73.213 – 10.167.73.213	10.167.73.213
87	10.167.73.214/32	10.167.73.214 – 10.167.73.214	10.167.73.214
88	10.167.73.215/32	10.167.73.215 – 10.167.73.215	10.167.73.215
89	10.167.73.216/32	10.167.73.216 – 10.167.73.216	10.167.73.216
90	10.167.73.217/32	10.167.73.217 – 10.167.73.217	10.167.73.217
91	10.167.73.218/32	10.167.73.218 – 10.167.73.218	10.167.73.218
92	10.167.73.219/32	10.167.73.219 – 10.167.73.219	10.167.73.219
93	10.167.73.220/32	10.167.73.220 – 10.167.73.220	10.167.73.220
94	10.167.73.221/32	10.167.73.221 – 10.167.73.221	10.167.73.221
95	10.167.73.222/32	10.167.73.222 – 10.167.73.222	10.167.73.222
96	10.167.73.223/32	10.167.73.223 – 10.167.73.223	10.167.73.223
97	10.167.73.224/32	10.167.73.224 – 10.167.73.224	10.167.73.224
98	10.167.73.225/32	10.167.73.225 – 10.167.73.225	10.167.73.225
99	10.167.73.226/32	10.167.73.226 – 10.167.73.226	10.167.73.226
100	10.167.73.227/32	10.167.73.227 – 10.167.73.227	10.167.73.227
101	10.167.73.228/32	10.167.73.228 – 10.167.73.228	10.167.73.228
102	10.167.73.229/32	10.167.73.229 – 10.167.73.229	10.167.73.229
103	10.167.73.230/32	10.167.73.230 – 10.167.73.230	10.167.73.230
104	10.167.73.231/32	10.167.73.231 – 10.167.73.231	10.167.73.231
105	10.167.73.232/32	10.167.73.232 – 10.167.73.232	10.167.73.232
106	10.167.73.233/32	10.167.73.233 – 10.167.73.233	10.167.73.233
107	10.167.73.234/32	10.167.73.234 – 10.167.73.234	10.167.73.234
108	10.167.73.235/32	10.167.73.235 – 10.167.73.235	10.167.73.235
109	10.167.73.236/32	10.167.73.236 – 10.167.73.236	10.167.73.236
110	10.167.73.237/32	10.167.73.237 – 10.167.73.237	10.167.73.237
111	10.167.73.238/32	10.167.73.238 – 10.167.73.238	10.167.73.238
112	10.167.73.239/32	10.167.73.239 – 10.167.73.239	10.167.73.239
113	10.167.73.240/32	10.167.73.240 – 10.167.73.240	10.167.73.240
114	10.167.73.241/32	10.167.73.241 – 10.167.73.241	10.167.73.241
115	10.167.73.242/32	10.167.73.242 – 10.167.73.242	10.167.73.242
116	10.167.73.243/32	10.167.73.243 – 10.167.73.243	10.167.73.243
117	10.167.73.244/32	10.167.73.244 – 10.167.73.244	10.167.73.244
118	10.167.73.245/32	10.167.73.245 – 10.167.73.245	10.167.73.245
119	10.167.73.246/32	10.167.73.246 – 10.167.73.246	10.167.73.246
120	10.167.73.247/32	10.167.73.247 – 10.167.73.247	10.167.73.247
121	10.167.73.248/32	10.167.73.248 – 10.167.73.248	10.167.73.248
122	10.167.73.249/32	10.167.73.249 – 10.167.73.249	10.167.73.249
123	10.167.73.250/32	10.167.73.250 – 10.167.73.250	10.167.73.250
124	10.167.73.251/32	10.167.73.251 – 10.167.73.251	10.167.73.251
125	10.167.73.252/32	10.167.73.252 – 10.167.73.252	10.167.73.252
126	10.167.73.253/32	10.167.73.253 – 10.167.73.253	10.167.73.253
127	10.167.73.254/32	10.167.73.254 – 10.167.73.254	10.167.73.254
128	10.167.73.255/32	10.167.73.255 – 10.167.73.255	10.167.73.255

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 →