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)10.167.11.128/25

network10.167.11.128/25

broadcast10.167.11.255

first host10.167.11.129

last host10.167.11.254

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.167.11.128/25

address00001010.10100111.00001011.10000000

subnet mask11111111.11111111.11111111.10000000

network00001010.10100111.00001011.10000000

broadcast00001010.10100111.00001011.11111111

green = network part, grey = host part

hex0x0aa70b80

decimal178719616

reverse dns128.11.167.10.in-addr.arpa

ipv4-mapped::ffff:aa7:b80

/25 split into /32 · 128 subnets

close ×

#	network	host range	broadcast
1	10.167.11.128/32	10.167.11.128 – 10.167.11.128	10.167.11.128
2	10.167.11.129/32	10.167.11.129 – 10.167.11.129	10.167.11.129
3	10.167.11.130/32	10.167.11.130 – 10.167.11.130	10.167.11.130
4	10.167.11.131/32	10.167.11.131 – 10.167.11.131	10.167.11.131
5	10.167.11.132/32	10.167.11.132 – 10.167.11.132	10.167.11.132
6	10.167.11.133/32	10.167.11.133 – 10.167.11.133	10.167.11.133
7	10.167.11.134/32	10.167.11.134 – 10.167.11.134	10.167.11.134
8	10.167.11.135/32	10.167.11.135 – 10.167.11.135	10.167.11.135
9	10.167.11.136/32	10.167.11.136 – 10.167.11.136	10.167.11.136
10	10.167.11.137/32	10.167.11.137 – 10.167.11.137	10.167.11.137
11	10.167.11.138/32	10.167.11.138 – 10.167.11.138	10.167.11.138
12	10.167.11.139/32	10.167.11.139 – 10.167.11.139	10.167.11.139
13	10.167.11.140/32	10.167.11.140 – 10.167.11.140	10.167.11.140
14	10.167.11.141/32	10.167.11.141 – 10.167.11.141	10.167.11.141
15	10.167.11.142/32	10.167.11.142 – 10.167.11.142	10.167.11.142
16	10.167.11.143/32	10.167.11.143 – 10.167.11.143	10.167.11.143
17	10.167.11.144/32	10.167.11.144 – 10.167.11.144	10.167.11.144
18	10.167.11.145/32	10.167.11.145 – 10.167.11.145	10.167.11.145
19	10.167.11.146/32	10.167.11.146 – 10.167.11.146	10.167.11.146
20	10.167.11.147/32	10.167.11.147 – 10.167.11.147	10.167.11.147
21	10.167.11.148/32	10.167.11.148 – 10.167.11.148	10.167.11.148
22	10.167.11.149/32	10.167.11.149 – 10.167.11.149	10.167.11.149
23	10.167.11.150/32	10.167.11.150 – 10.167.11.150	10.167.11.150
24	10.167.11.151/32	10.167.11.151 – 10.167.11.151	10.167.11.151
25	10.167.11.152/32	10.167.11.152 – 10.167.11.152	10.167.11.152
26	10.167.11.153/32	10.167.11.153 – 10.167.11.153	10.167.11.153
27	10.167.11.154/32	10.167.11.154 – 10.167.11.154	10.167.11.154
28	10.167.11.155/32	10.167.11.155 – 10.167.11.155	10.167.11.155
29	10.167.11.156/32	10.167.11.156 – 10.167.11.156	10.167.11.156
30	10.167.11.157/32	10.167.11.157 – 10.167.11.157	10.167.11.157
31	10.167.11.158/32	10.167.11.158 – 10.167.11.158	10.167.11.158
32	10.167.11.159/32	10.167.11.159 – 10.167.11.159	10.167.11.159
33	10.167.11.160/32	10.167.11.160 – 10.167.11.160	10.167.11.160
34	10.167.11.161/32	10.167.11.161 – 10.167.11.161	10.167.11.161
35	10.167.11.162/32	10.167.11.162 – 10.167.11.162	10.167.11.162
36	10.167.11.163/32	10.167.11.163 – 10.167.11.163	10.167.11.163
37	10.167.11.164/32	10.167.11.164 – 10.167.11.164	10.167.11.164
38	10.167.11.165/32	10.167.11.165 – 10.167.11.165	10.167.11.165
39	10.167.11.166/32	10.167.11.166 – 10.167.11.166	10.167.11.166
40	10.167.11.167/32	10.167.11.167 – 10.167.11.167	10.167.11.167
41	10.167.11.168/32	10.167.11.168 – 10.167.11.168	10.167.11.168
42	10.167.11.169/32	10.167.11.169 – 10.167.11.169	10.167.11.169
43	10.167.11.170/32	10.167.11.170 – 10.167.11.170	10.167.11.170
44	10.167.11.171/32	10.167.11.171 – 10.167.11.171	10.167.11.171
45	10.167.11.172/32	10.167.11.172 – 10.167.11.172	10.167.11.172
46	10.167.11.173/32	10.167.11.173 – 10.167.11.173	10.167.11.173
47	10.167.11.174/32	10.167.11.174 – 10.167.11.174	10.167.11.174
48	10.167.11.175/32	10.167.11.175 – 10.167.11.175	10.167.11.175
49	10.167.11.176/32	10.167.11.176 – 10.167.11.176	10.167.11.176
50	10.167.11.177/32	10.167.11.177 – 10.167.11.177	10.167.11.177
51	10.167.11.178/32	10.167.11.178 – 10.167.11.178	10.167.11.178
52	10.167.11.179/32	10.167.11.179 – 10.167.11.179	10.167.11.179
53	10.167.11.180/32	10.167.11.180 – 10.167.11.180	10.167.11.180
54	10.167.11.181/32	10.167.11.181 – 10.167.11.181	10.167.11.181
55	10.167.11.182/32	10.167.11.182 – 10.167.11.182	10.167.11.182
56	10.167.11.183/32	10.167.11.183 – 10.167.11.183	10.167.11.183
57	10.167.11.184/32	10.167.11.184 – 10.167.11.184	10.167.11.184
58	10.167.11.185/32	10.167.11.185 – 10.167.11.185	10.167.11.185
59	10.167.11.186/32	10.167.11.186 – 10.167.11.186	10.167.11.186
60	10.167.11.187/32	10.167.11.187 – 10.167.11.187	10.167.11.187
61	10.167.11.188/32	10.167.11.188 – 10.167.11.188	10.167.11.188
62	10.167.11.189/32	10.167.11.189 – 10.167.11.189	10.167.11.189
63	10.167.11.190/32	10.167.11.190 – 10.167.11.190	10.167.11.190
64	10.167.11.191/32	10.167.11.191 – 10.167.11.191	10.167.11.191
65	10.167.11.192/32	10.167.11.192 – 10.167.11.192	10.167.11.192
66	10.167.11.193/32	10.167.11.193 – 10.167.11.193	10.167.11.193
67	10.167.11.194/32	10.167.11.194 – 10.167.11.194	10.167.11.194
68	10.167.11.195/32	10.167.11.195 – 10.167.11.195	10.167.11.195
69	10.167.11.196/32	10.167.11.196 – 10.167.11.196	10.167.11.196
70	10.167.11.197/32	10.167.11.197 – 10.167.11.197	10.167.11.197
71	10.167.11.198/32	10.167.11.198 – 10.167.11.198	10.167.11.198
72	10.167.11.199/32	10.167.11.199 – 10.167.11.199	10.167.11.199
73	10.167.11.200/32	10.167.11.200 – 10.167.11.200	10.167.11.200
74	10.167.11.201/32	10.167.11.201 – 10.167.11.201	10.167.11.201
75	10.167.11.202/32	10.167.11.202 – 10.167.11.202	10.167.11.202
76	10.167.11.203/32	10.167.11.203 – 10.167.11.203	10.167.11.203
77	10.167.11.204/32	10.167.11.204 – 10.167.11.204	10.167.11.204
78	10.167.11.205/32	10.167.11.205 – 10.167.11.205	10.167.11.205
79	10.167.11.206/32	10.167.11.206 – 10.167.11.206	10.167.11.206
80	10.167.11.207/32	10.167.11.207 – 10.167.11.207	10.167.11.207
81	10.167.11.208/32	10.167.11.208 – 10.167.11.208	10.167.11.208
82	10.167.11.209/32	10.167.11.209 – 10.167.11.209	10.167.11.209
83	10.167.11.210/32	10.167.11.210 – 10.167.11.210	10.167.11.210
84	10.167.11.211/32	10.167.11.211 – 10.167.11.211	10.167.11.211
85	10.167.11.212/32	10.167.11.212 – 10.167.11.212	10.167.11.212
86	10.167.11.213/32	10.167.11.213 – 10.167.11.213	10.167.11.213
87	10.167.11.214/32	10.167.11.214 – 10.167.11.214	10.167.11.214
88	10.167.11.215/32	10.167.11.215 – 10.167.11.215	10.167.11.215
89	10.167.11.216/32	10.167.11.216 – 10.167.11.216	10.167.11.216
90	10.167.11.217/32	10.167.11.217 – 10.167.11.217	10.167.11.217
91	10.167.11.218/32	10.167.11.218 – 10.167.11.218	10.167.11.218
92	10.167.11.219/32	10.167.11.219 – 10.167.11.219	10.167.11.219
93	10.167.11.220/32	10.167.11.220 – 10.167.11.220	10.167.11.220
94	10.167.11.221/32	10.167.11.221 – 10.167.11.221	10.167.11.221
95	10.167.11.222/32	10.167.11.222 – 10.167.11.222	10.167.11.222
96	10.167.11.223/32	10.167.11.223 – 10.167.11.223	10.167.11.223
97	10.167.11.224/32	10.167.11.224 – 10.167.11.224	10.167.11.224
98	10.167.11.225/32	10.167.11.225 – 10.167.11.225	10.167.11.225
99	10.167.11.226/32	10.167.11.226 – 10.167.11.226	10.167.11.226
100	10.167.11.227/32	10.167.11.227 – 10.167.11.227	10.167.11.227
101	10.167.11.228/32	10.167.11.228 – 10.167.11.228	10.167.11.228
102	10.167.11.229/32	10.167.11.229 – 10.167.11.229	10.167.11.229
103	10.167.11.230/32	10.167.11.230 – 10.167.11.230	10.167.11.230
104	10.167.11.231/32	10.167.11.231 – 10.167.11.231	10.167.11.231
105	10.167.11.232/32	10.167.11.232 – 10.167.11.232	10.167.11.232
106	10.167.11.233/32	10.167.11.233 – 10.167.11.233	10.167.11.233
107	10.167.11.234/32	10.167.11.234 – 10.167.11.234	10.167.11.234
108	10.167.11.235/32	10.167.11.235 – 10.167.11.235	10.167.11.235
109	10.167.11.236/32	10.167.11.236 – 10.167.11.236	10.167.11.236
110	10.167.11.237/32	10.167.11.237 – 10.167.11.237	10.167.11.237
111	10.167.11.238/32	10.167.11.238 – 10.167.11.238	10.167.11.238
112	10.167.11.239/32	10.167.11.239 – 10.167.11.239	10.167.11.239
113	10.167.11.240/32	10.167.11.240 – 10.167.11.240	10.167.11.240
114	10.167.11.241/32	10.167.11.241 – 10.167.11.241	10.167.11.241
115	10.167.11.242/32	10.167.11.242 – 10.167.11.242	10.167.11.242
116	10.167.11.243/32	10.167.11.243 – 10.167.11.243	10.167.11.243
117	10.167.11.244/32	10.167.11.244 – 10.167.11.244	10.167.11.244
118	10.167.11.245/32	10.167.11.245 – 10.167.11.245	10.167.11.245
119	10.167.11.246/32	10.167.11.246 – 10.167.11.246	10.167.11.246
120	10.167.11.247/32	10.167.11.247 – 10.167.11.247	10.167.11.247
121	10.167.11.248/32	10.167.11.248 – 10.167.11.248	10.167.11.248
122	10.167.11.249/32	10.167.11.249 – 10.167.11.249	10.167.11.249
123	10.167.11.250/32	10.167.11.250 – 10.167.11.250	10.167.11.250
124	10.167.11.251/32	10.167.11.251 – 10.167.11.251	10.167.11.251
125	10.167.11.252/32	10.167.11.252 – 10.167.11.252	10.167.11.252
126	10.167.11.253/32	10.167.11.253 – 10.167.11.253	10.167.11.253
127	10.167.11.254/32	10.167.11.254 – 10.167.11.254	10.167.11.254
128	10.167.11.255/32	10.167.11.255 – 10.167.11.255	10.167.11.255

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 →