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)10.167.28.128/25

network10.167.28.128/25

broadcast10.167.28.255

first host10.167.28.129

last host10.167.28.254

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.167.28.128/25

address00001010.10100111.00011100.10000000

subnet mask11111111.11111111.11111111.10000000

network00001010.10100111.00011100.10000000

broadcast00001010.10100111.00011100.11111111

green = network part, grey = host part

hex0x0aa71c80

decimal178723968

reverse dns128.28.167.10.in-addr.arpa

ipv4-mapped::ffff:aa7:1c80

/25 split into /32 · 128 subnets

close ×

#	network	host range	broadcast
1	10.167.28.128/32	10.167.28.128 – 10.167.28.128	10.167.28.128
2	10.167.28.129/32	10.167.28.129 – 10.167.28.129	10.167.28.129
3	10.167.28.130/32	10.167.28.130 – 10.167.28.130	10.167.28.130
4	10.167.28.131/32	10.167.28.131 – 10.167.28.131	10.167.28.131
5	10.167.28.132/32	10.167.28.132 – 10.167.28.132	10.167.28.132
6	10.167.28.133/32	10.167.28.133 – 10.167.28.133	10.167.28.133
7	10.167.28.134/32	10.167.28.134 – 10.167.28.134	10.167.28.134
8	10.167.28.135/32	10.167.28.135 – 10.167.28.135	10.167.28.135
9	10.167.28.136/32	10.167.28.136 – 10.167.28.136	10.167.28.136
10	10.167.28.137/32	10.167.28.137 – 10.167.28.137	10.167.28.137
11	10.167.28.138/32	10.167.28.138 – 10.167.28.138	10.167.28.138
12	10.167.28.139/32	10.167.28.139 – 10.167.28.139	10.167.28.139
13	10.167.28.140/32	10.167.28.140 – 10.167.28.140	10.167.28.140
14	10.167.28.141/32	10.167.28.141 – 10.167.28.141	10.167.28.141
15	10.167.28.142/32	10.167.28.142 – 10.167.28.142	10.167.28.142
16	10.167.28.143/32	10.167.28.143 – 10.167.28.143	10.167.28.143
17	10.167.28.144/32	10.167.28.144 – 10.167.28.144	10.167.28.144
18	10.167.28.145/32	10.167.28.145 – 10.167.28.145	10.167.28.145
19	10.167.28.146/32	10.167.28.146 – 10.167.28.146	10.167.28.146
20	10.167.28.147/32	10.167.28.147 – 10.167.28.147	10.167.28.147
21	10.167.28.148/32	10.167.28.148 – 10.167.28.148	10.167.28.148
22	10.167.28.149/32	10.167.28.149 – 10.167.28.149	10.167.28.149
23	10.167.28.150/32	10.167.28.150 – 10.167.28.150	10.167.28.150
24	10.167.28.151/32	10.167.28.151 – 10.167.28.151	10.167.28.151
25	10.167.28.152/32	10.167.28.152 – 10.167.28.152	10.167.28.152
26	10.167.28.153/32	10.167.28.153 – 10.167.28.153	10.167.28.153
27	10.167.28.154/32	10.167.28.154 – 10.167.28.154	10.167.28.154
28	10.167.28.155/32	10.167.28.155 – 10.167.28.155	10.167.28.155
29	10.167.28.156/32	10.167.28.156 – 10.167.28.156	10.167.28.156
30	10.167.28.157/32	10.167.28.157 – 10.167.28.157	10.167.28.157
31	10.167.28.158/32	10.167.28.158 – 10.167.28.158	10.167.28.158
32	10.167.28.159/32	10.167.28.159 – 10.167.28.159	10.167.28.159
33	10.167.28.160/32	10.167.28.160 – 10.167.28.160	10.167.28.160
34	10.167.28.161/32	10.167.28.161 – 10.167.28.161	10.167.28.161
35	10.167.28.162/32	10.167.28.162 – 10.167.28.162	10.167.28.162
36	10.167.28.163/32	10.167.28.163 – 10.167.28.163	10.167.28.163
37	10.167.28.164/32	10.167.28.164 – 10.167.28.164	10.167.28.164
38	10.167.28.165/32	10.167.28.165 – 10.167.28.165	10.167.28.165
39	10.167.28.166/32	10.167.28.166 – 10.167.28.166	10.167.28.166
40	10.167.28.167/32	10.167.28.167 – 10.167.28.167	10.167.28.167
41	10.167.28.168/32	10.167.28.168 – 10.167.28.168	10.167.28.168
42	10.167.28.169/32	10.167.28.169 – 10.167.28.169	10.167.28.169
43	10.167.28.170/32	10.167.28.170 – 10.167.28.170	10.167.28.170
44	10.167.28.171/32	10.167.28.171 – 10.167.28.171	10.167.28.171
45	10.167.28.172/32	10.167.28.172 – 10.167.28.172	10.167.28.172
46	10.167.28.173/32	10.167.28.173 – 10.167.28.173	10.167.28.173
47	10.167.28.174/32	10.167.28.174 – 10.167.28.174	10.167.28.174
48	10.167.28.175/32	10.167.28.175 – 10.167.28.175	10.167.28.175
49	10.167.28.176/32	10.167.28.176 – 10.167.28.176	10.167.28.176
50	10.167.28.177/32	10.167.28.177 – 10.167.28.177	10.167.28.177
51	10.167.28.178/32	10.167.28.178 – 10.167.28.178	10.167.28.178
52	10.167.28.179/32	10.167.28.179 – 10.167.28.179	10.167.28.179
53	10.167.28.180/32	10.167.28.180 – 10.167.28.180	10.167.28.180
54	10.167.28.181/32	10.167.28.181 – 10.167.28.181	10.167.28.181
55	10.167.28.182/32	10.167.28.182 – 10.167.28.182	10.167.28.182
56	10.167.28.183/32	10.167.28.183 – 10.167.28.183	10.167.28.183
57	10.167.28.184/32	10.167.28.184 – 10.167.28.184	10.167.28.184
58	10.167.28.185/32	10.167.28.185 – 10.167.28.185	10.167.28.185
59	10.167.28.186/32	10.167.28.186 – 10.167.28.186	10.167.28.186
60	10.167.28.187/32	10.167.28.187 – 10.167.28.187	10.167.28.187
61	10.167.28.188/32	10.167.28.188 – 10.167.28.188	10.167.28.188
62	10.167.28.189/32	10.167.28.189 – 10.167.28.189	10.167.28.189
63	10.167.28.190/32	10.167.28.190 – 10.167.28.190	10.167.28.190
64	10.167.28.191/32	10.167.28.191 – 10.167.28.191	10.167.28.191
65	10.167.28.192/32	10.167.28.192 – 10.167.28.192	10.167.28.192
66	10.167.28.193/32	10.167.28.193 – 10.167.28.193	10.167.28.193
67	10.167.28.194/32	10.167.28.194 – 10.167.28.194	10.167.28.194
68	10.167.28.195/32	10.167.28.195 – 10.167.28.195	10.167.28.195
69	10.167.28.196/32	10.167.28.196 – 10.167.28.196	10.167.28.196
70	10.167.28.197/32	10.167.28.197 – 10.167.28.197	10.167.28.197
71	10.167.28.198/32	10.167.28.198 – 10.167.28.198	10.167.28.198
72	10.167.28.199/32	10.167.28.199 – 10.167.28.199	10.167.28.199
73	10.167.28.200/32	10.167.28.200 – 10.167.28.200	10.167.28.200
74	10.167.28.201/32	10.167.28.201 – 10.167.28.201	10.167.28.201
75	10.167.28.202/32	10.167.28.202 – 10.167.28.202	10.167.28.202
76	10.167.28.203/32	10.167.28.203 – 10.167.28.203	10.167.28.203
77	10.167.28.204/32	10.167.28.204 – 10.167.28.204	10.167.28.204
78	10.167.28.205/32	10.167.28.205 – 10.167.28.205	10.167.28.205
79	10.167.28.206/32	10.167.28.206 – 10.167.28.206	10.167.28.206
80	10.167.28.207/32	10.167.28.207 – 10.167.28.207	10.167.28.207
81	10.167.28.208/32	10.167.28.208 – 10.167.28.208	10.167.28.208
82	10.167.28.209/32	10.167.28.209 – 10.167.28.209	10.167.28.209
83	10.167.28.210/32	10.167.28.210 – 10.167.28.210	10.167.28.210
84	10.167.28.211/32	10.167.28.211 – 10.167.28.211	10.167.28.211
85	10.167.28.212/32	10.167.28.212 – 10.167.28.212	10.167.28.212
86	10.167.28.213/32	10.167.28.213 – 10.167.28.213	10.167.28.213
87	10.167.28.214/32	10.167.28.214 – 10.167.28.214	10.167.28.214
88	10.167.28.215/32	10.167.28.215 – 10.167.28.215	10.167.28.215
89	10.167.28.216/32	10.167.28.216 – 10.167.28.216	10.167.28.216
90	10.167.28.217/32	10.167.28.217 – 10.167.28.217	10.167.28.217
91	10.167.28.218/32	10.167.28.218 – 10.167.28.218	10.167.28.218
92	10.167.28.219/32	10.167.28.219 – 10.167.28.219	10.167.28.219
93	10.167.28.220/32	10.167.28.220 – 10.167.28.220	10.167.28.220
94	10.167.28.221/32	10.167.28.221 – 10.167.28.221	10.167.28.221
95	10.167.28.222/32	10.167.28.222 – 10.167.28.222	10.167.28.222
96	10.167.28.223/32	10.167.28.223 – 10.167.28.223	10.167.28.223
97	10.167.28.224/32	10.167.28.224 – 10.167.28.224	10.167.28.224
98	10.167.28.225/32	10.167.28.225 – 10.167.28.225	10.167.28.225
99	10.167.28.226/32	10.167.28.226 – 10.167.28.226	10.167.28.226
100	10.167.28.227/32	10.167.28.227 – 10.167.28.227	10.167.28.227
101	10.167.28.228/32	10.167.28.228 – 10.167.28.228	10.167.28.228
102	10.167.28.229/32	10.167.28.229 – 10.167.28.229	10.167.28.229
103	10.167.28.230/32	10.167.28.230 – 10.167.28.230	10.167.28.230
104	10.167.28.231/32	10.167.28.231 – 10.167.28.231	10.167.28.231
105	10.167.28.232/32	10.167.28.232 – 10.167.28.232	10.167.28.232
106	10.167.28.233/32	10.167.28.233 – 10.167.28.233	10.167.28.233
107	10.167.28.234/32	10.167.28.234 – 10.167.28.234	10.167.28.234
108	10.167.28.235/32	10.167.28.235 – 10.167.28.235	10.167.28.235
109	10.167.28.236/32	10.167.28.236 – 10.167.28.236	10.167.28.236
110	10.167.28.237/32	10.167.28.237 – 10.167.28.237	10.167.28.237
111	10.167.28.238/32	10.167.28.238 – 10.167.28.238	10.167.28.238
112	10.167.28.239/32	10.167.28.239 – 10.167.28.239	10.167.28.239
113	10.167.28.240/32	10.167.28.240 – 10.167.28.240	10.167.28.240
114	10.167.28.241/32	10.167.28.241 – 10.167.28.241	10.167.28.241
115	10.167.28.242/32	10.167.28.242 – 10.167.28.242	10.167.28.242
116	10.167.28.243/32	10.167.28.243 – 10.167.28.243	10.167.28.243
117	10.167.28.244/32	10.167.28.244 – 10.167.28.244	10.167.28.244
118	10.167.28.245/32	10.167.28.245 – 10.167.28.245	10.167.28.245
119	10.167.28.246/32	10.167.28.246 – 10.167.28.246	10.167.28.246
120	10.167.28.247/32	10.167.28.247 – 10.167.28.247	10.167.28.247
121	10.167.28.248/32	10.167.28.248 – 10.167.28.248	10.167.28.248
122	10.167.28.249/32	10.167.28.249 – 10.167.28.249	10.167.28.249
123	10.167.28.250/32	10.167.28.250 – 10.167.28.250	10.167.28.250
124	10.167.28.251/32	10.167.28.251 – 10.167.28.251	10.167.28.251
125	10.167.28.252/32	10.167.28.252 – 10.167.28.252	10.167.28.252
126	10.167.28.253/32	10.167.28.253 – 10.167.28.253	10.167.28.253
127	10.167.28.254/32	10.167.28.254 – 10.167.28.254	10.167.28.254
128	10.167.28.255/32	10.167.28.255 – 10.167.28.255	10.167.28.255

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 →