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)10.167.128.128/25

network10.167.128.128/25

broadcast10.167.128.255

first host10.167.128.129

last host10.167.128.254

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.167.128.128/25

address00001010.10100111.10000000.10000000

subnet mask11111111.11111111.11111111.10000000

network00001010.10100111.10000000.10000000

broadcast00001010.10100111.10000000.11111111

green = network part, grey = host part

hex0x0aa78080

decimal178749568

reverse dns128.128.167.10.in-addr.arpa

ipv4-mapped::ffff:aa7:8080

/25 split into /32 · 128 subnets

close ×

#	network	host range	broadcast
1	10.167.128.128/32	10.167.128.128 – 10.167.128.128	10.167.128.128
2	10.167.128.129/32	10.167.128.129 – 10.167.128.129	10.167.128.129
3	10.167.128.130/32	10.167.128.130 – 10.167.128.130	10.167.128.130
4	10.167.128.131/32	10.167.128.131 – 10.167.128.131	10.167.128.131
5	10.167.128.132/32	10.167.128.132 – 10.167.128.132	10.167.128.132
6	10.167.128.133/32	10.167.128.133 – 10.167.128.133	10.167.128.133
7	10.167.128.134/32	10.167.128.134 – 10.167.128.134	10.167.128.134
8	10.167.128.135/32	10.167.128.135 – 10.167.128.135	10.167.128.135
9	10.167.128.136/32	10.167.128.136 – 10.167.128.136	10.167.128.136
10	10.167.128.137/32	10.167.128.137 – 10.167.128.137	10.167.128.137
11	10.167.128.138/32	10.167.128.138 – 10.167.128.138	10.167.128.138
12	10.167.128.139/32	10.167.128.139 – 10.167.128.139	10.167.128.139
13	10.167.128.140/32	10.167.128.140 – 10.167.128.140	10.167.128.140
14	10.167.128.141/32	10.167.128.141 – 10.167.128.141	10.167.128.141
15	10.167.128.142/32	10.167.128.142 – 10.167.128.142	10.167.128.142
16	10.167.128.143/32	10.167.128.143 – 10.167.128.143	10.167.128.143
17	10.167.128.144/32	10.167.128.144 – 10.167.128.144	10.167.128.144
18	10.167.128.145/32	10.167.128.145 – 10.167.128.145	10.167.128.145
19	10.167.128.146/32	10.167.128.146 – 10.167.128.146	10.167.128.146
20	10.167.128.147/32	10.167.128.147 – 10.167.128.147	10.167.128.147
21	10.167.128.148/32	10.167.128.148 – 10.167.128.148	10.167.128.148
22	10.167.128.149/32	10.167.128.149 – 10.167.128.149	10.167.128.149
23	10.167.128.150/32	10.167.128.150 – 10.167.128.150	10.167.128.150
24	10.167.128.151/32	10.167.128.151 – 10.167.128.151	10.167.128.151
25	10.167.128.152/32	10.167.128.152 – 10.167.128.152	10.167.128.152
26	10.167.128.153/32	10.167.128.153 – 10.167.128.153	10.167.128.153
27	10.167.128.154/32	10.167.128.154 – 10.167.128.154	10.167.128.154
28	10.167.128.155/32	10.167.128.155 – 10.167.128.155	10.167.128.155
29	10.167.128.156/32	10.167.128.156 – 10.167.128.156	10.167.128.156
30	10.167.128.157/32	10.167.128.157 – 10.167.128.157	10.167.128.157
31	10.167.128.158/32	10.167.128.158 – 10.167.128.158	10.167.128.158
32	10.167.128.159/32	10.167.128.159 – 10.167.128.159	10.167.128.159
33	10.167.128.160/32	10.167.128.160 – 10.167.128.160	10.167.128.160
34	10.167.128.161/32	10.167.128.161 – 10.167.128.161	10.167.128.161
35	10.167.128.162/32	10.167.128.162 – 10.167.128.162	10.167.128.162
36	10.167.128.163/32	10.167.128.163 – 10.167.128.163	10.167.128.163
37	10.167.128.164/32	10.167.128.164 – 10.167.128.164	10.167.128.164
38	10.167.128.165/32	10.167.128.165 – 10.167.128.165	10.167.128.165
39	10.167.128.166/32	10.167.128.166 – 10.167.128.166	10.167.128.166
40	10.167.128.167/32	10.167.128.167 – 10.167.128.167	10.167.128.167
41	10.167.128.168/32	10.167.128.168 – 10.167.128.168	10.167.128.168
42	10.167.128.169/32	10.167.128.169 – 10.167.128.169	10.167.128.169
43	10.167.128.170/32	10.167.128.170 – 10.167.128.170	10.167.128.170
44	10.167.128.171/32	10.167.128.171 – 10.167.128.171	10.167.128.171
45	10.167.128.172/32	10.167.128.172 – 10.167.128.172	10.167.128.172
46	10.167.128.173/32	10.167.128.173 – 10.167.128.173	10.167.128.173
47	10.167.128.174/32	10.167.128.174 – 10.167.128.174	10.167.128.174
48	10.167.128.175/32	10.167.128.175 – 10.167.128.175	10.167.128.175
49	10.167.128.176/32	10.167.128.176 – 10.167.128.176	10.167.128.176
50	10.167.128.177/32	10.167.128.177 – 10.167.128.177	10.167.128.177
51	10.167.128.178/32	10.167.128.178 – 10.167.128.178	10.167.128.178
52	10.167.128.179/32	10.167.128.179 – 10.167.128.179	10.167.128.179
53	10.167.128.180/32	10.167.128.180 – 10.167.128.180	10.167.128.180
54	10.167.128.181/32	10.167.128.181 – 10.167.128.181	10.167.128.181
55	10.167.128.182/32	10.167.128.182 – 10.167.128.182	10.167.128.182
56	10.167.128.183/32	10.167.128.183 – 10.167.128.183	10.167.128.183
57	10.167.128.184/32	10.167.128.184 – 10.167.128.184	10.167.128.184
58	10.167.128.185/32	10.167.128.185 – 10.167.128.185	10.167.128.185
59	10.167.128.186/32	10.167.128.186 – 10.167.128.186	10.167.128.186
60	10.167.128.187/32	10.167.128.187 – 10.167.128.187	10.167.128.187
61	10.167.128.188/32	10.167.128.188 – 10.167.128.188	10.167.128.188
62	10.167.128.189/32	10.167.128.189 – 10.167.128.189	10.167.128.189
63	10.167.128.190/32	10.167.128.190 – 10.167.128.190	10.167.128.190
64	10.167.128.191/32	10.167.128.191 – 10.167.128.191	10.167.128.191
65	10.167.128.192/32	10.167.128.192 – 10.167.128.192	10.167.128.192
66	10.167.128.193/32	10.167.128.193 – 10.167.128.193	10.167.128.193
67	10.167.128.194/32	10.167.128.194 – 10.167.128.194	10.167.128.194
68	10.167.128.195/32	10.167.128.195 – 10.167.128.195	10.167.128.195
69	10.167.128.196/32	10.167.128.196 – 10.167.128.196	10.167.128.196
70	10.167.128.197/32	10.167.128.197 – 10.167.128.197	10.167.128.197
71	10.167.128.198/32	10.167.128.198 – 10.167.128.198	10.167.128.198
72	10.167.128.199/32	10.167.128.199 – 10.167.128.199	10.167.128.199
73	10.167.128.200/32	10.167.128.200 – 10.167.128.200	10.167.128.200
74	10.167.128.201/32	10.167.128.201 – 10.167.128.201	10.167.128.201
75	10.167.128.202/32	10.167.128.202 – 10.167.128.202	10.167.128.202
76	10.167.128.203/32	10.167.128.203 – 10.167.128.203	10.167.128.203
77	10.167.128.204/32	10.167.128.204 – 10.167.128.204	10.167.128.204
78	10.167.128.205/32	10.167.128.205 – 10.167.128.205	10.167.128.205
79	10.167.128.206/32	10.167.128.206 – 10.167.128.206	10.167.128.206
80	10.167.128.207/32	10.167.128.207 – 10.167.128.207	10.167.128.207
81	10.167.128.208/32	10.167.128.208 – 10.167.128.208	10.167.128.208
82	10.167.128.209/32	10.167.128.209 – 10.167.128.209	10.167.128.209
83	10.167.128.210/32	10.167.128.210 – 10.167.128.210	10.167.128.210
84	10.167.128.211/32	10.167.128.211 – 10.167.128.211	10.167.128.211
85	10.167.128.212/32	10.167.128.212 – 10.167.128.212	10.167.128.212
86	10.167.128.213/32	10.167.128.213 – 10.167.128.213	10.167.128.213
87	10.167.128.214/32	10.167.128.214 – 10.167.128.214	10.167.128.214
88	10.167.128.215/32	10.167.128.215 – 10.167.128.215	10.167.128.215
89	10.167.128.216/32	10.167.128.216 – 10.167.128.216	10.167.128.216
90	10.167.128.217/32	10.167.128.217 – 10.167.128.217	10.167.128.217
91	10.167.128.218/32	10.167.128.218 – 10.167.128.218	10.167.128.218
92	10.167.128.219/32	10.167.128.219 – 10.167.128.219	10.167.128.219
93	10.167.128.220/32	10.167.128.220 – 10.167.128.220	10.167.128.220
94	10.167.128.221/32	10.167.128.221 – 10.167.128.221	10.167.128.221
95	10.167.128.222/32	10.167.128.222 – 10.167.128.222	10.167.128.222
96	10.167.128.223/32	10.167.128.223 – 10.167.128.223	10.167.128.223
97	10.167.128.224/32	10.167.128.224 – 10.167.128.224	10.167.128.224
98	10.167.128.225/32	10.167.128.225 – 10.167.128.225	10.167.128.225
99	10.167.128.226/32	10.167.128.226 – 10.167.128.226	10.167.128.226
100	10.167.128.227/32	10.167.128.227 – 10.167.128.227	10.167.128.227
101	10.167.128.228/32	10.167.128.228 – 10.167.128.228	10.167.128.228
102	10.167.128.229/32	10.167.128.229 – 10.167.128.229	10.167.128.229
103	10.167.128.230/32	10.167.128.230 – 10.167.128.230	10.167.128.230
104	10.167.128.231/32	10.167.128.231 – 10.167.128.231	10.167.128.231
105	10.167.128.232/32	10.167.128.232 – 10.167.128.232	10.167.128.232
106	10.167.128.233/32	10.167.128.233 – 10.167.128.233	10.167.128.233
107	10.167.128.234/32	10.167.128.234 – 10.167.128.234	10.167.128.234
108	10.167.128.235/32	10.167.128.235 – 10.167.128.235	10.167.128.235
109	10.167.128.236/32	10.167.128.236 – 10.167.128.236	10.167.128.236
110	10.167.128.237/32	10.167.128.237 – 10.167.128.237	10.167.128.237
111	10.167.128.238/32	10.167.128.238 – 10.167.128.238	10.167.128.238
112	10.167.128.239/32	10.167.128.239 – 10.167.128.239	10.167.128.239
113	10.167.128.240/32	10.167.128.240 – 10.167.128.240	10.167.128.240
114	10.167.128.241/32	10.167.128.241 – 10.167.128.241	10.167.128.241
115	10.167.128.242/32	10.167.128.242 – 10.167.128.242	10.167.128.242
116	10.167.128.243/32	10.167.128.243 – 10.167.128.243	10.167.128.243
117	10.167.128.244/32	10.167.128.244 – 10.167.128.244	10.167.128.244
118	10.167.128.245/32	10.167.128.245 – 10.167.128.245	10.167.128.245
119	10.167.128.246/32	10.167.128.246 – 10.167.128.246	10.167.128.246
120	10.167.128.247/32	10.167.128.247 – 10.167.128.247	10.167.128.247
121	10.167.128.248/32	10.167.128.248 – 10.167.128.248	10.167.128.248
122	10.167.128.249/32	10.167.128.249 – 10.167.128.249	10.167.128.249
123	10.167.128.250/32	10.167.128.250 – 10.167.128.250	10.167.128.250
124	10.167.128.251/32	10.167.128.251 – 10.167.128.251	10.167.128.251
125	10.167.128.252/32	10.167.128.252 – 10.167.128.252	10.167.128.252
126	10.167.128.253/32	10.167.128.253 – 10.167.128.253	10.167.128.253
127	10.167.128.254/32	10.167.128.254 – 10.167.128.254	10.167.128.254
128	10.167.128.255/32	10.167.128.255 – 10.167.128.255	10.167.128.255

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 →