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)10.167.171.128/25

network10.167.171.128/25

broadcast10.167.171.255

first host10.167.171.129

last host10.167.171.254

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.167.171.128/25

address00001010.10100111.10101011.10000000

subnet mask11111111.11111111.11111111.10000000

network00001010.10100111.10101011.10000000

broadcast00001010.10100111.10101011.11111111

green = network part, grey = host part

hex0x0aa7ab80

decimal178760576

reverse dns128.171.167.10.in-addr.arpa

ipv4-mapped::ffff:aa7:ab80

/25 split into /32 · 128 subnets

close ×

#	network	host range	broadcast
1	10.167.171.128/32	10.167.171.128 – 10.167.171.128	10.167.171.128
2	10.167.171.129/32	10.167.171.129 – 10.167.171.129	10.167.171.129
3	10.167.171.130/32	10.167.171.130 – 10.167.171.130	10.167.171.130
4	10.167.171.131/32	10.167.171.131 – 10.167.171.131	10.167.171.131
5	10.167.171.132/32	10.167.171.132 – 10.167.171.132	10.167.171.132
6	10.167.171.133/32	10.167.171.133 – 10.167.171.133	10.167.171.133
7	10.167.171.134/32	10.167.171.134 – 10.167.171.134	10.167.171.134
8	10.167.171.135/32	10.167.171.135 – 10.167.171.135	10.167.171.135
9	10.167.171.136/32	10.167.171.136 – 10.167.171.136	10.167.171.136
10	10.167.171.137/32	10.167.171.137 – 10.167.171.137	10.167.171.137
11	10.167.171.138/32	10.167.171.138 – 10.167.171.138	10.167.171.138
12	10.167.171.139/32	10.167.171.139 – 10.167.171.139	10.167.171.139
13	10.167.171.140/32	10.167.171.140 – 10.167.171.140	10.167.171.140
14	10.167.171.141/32	10.167.171.141 – 10.167.171.141	10.167.171.141
15	10.167.171.142/32	10.167.171.142 – 10.167.171.142	10.167.171.142
16	10.167.171.143/32	10.167.171.143 – 10.167.171.143	10.167.171.143
17	10.167.171.144/32	10.167.171.144 – 10.167.171.144	10.167.171.144
18	10.167.171.145/32	10.167.171.145 – 10.167.171.145	10.167.171.145
19	10.167.171.146/32	10.167.171.146 – 10.167.171.146	10.167.171.146
20	10.167.171.147/32	10.167.171.147 – 10.167.171.147	10.167.171.147
21	10.167.171.148/32	10.167.171.148 – 10.167.171.148	10.167.171.148
22	10.167.171.149/32	10.167.171.149 – 10.167.171.149	10.167.171.149
23	10.167.171.150/32	10.167.171.150 – 10.167.171.150	10.167.171.150
24	10.167.171.151/32	10.167.171.151 – 10.167.171.151	10.167.171.151
25	10.167.171.152/32	10.167.171.152 – 10.167.171.152	10.167.171.152
26	10.167.171.153/32	10.167.171.153 – 10.167.171.153	10.167.171.153
27	10.167.171.154/32	10.167.171.154 – 10.167.171.154	10.167.171.154
28	10.167.171.155/32	10.167.171.155 – 10.167.171.155	10.167.171.155
29	10.167.171.156/32	10.167.171.156 – 10.167.171.156	10.167.171.156
30	10.167.171.157/32	10.167.171.157 – 10.167.171.157	10.167.171.157
31	10.167.171.158/32	10.167.171.158 – 10.167.171.158	10.167.171.158
32	10.167.171.159/32	10.167.171.159 – 10.167.171.159	10.167.171.159
33	10.167.171.160/32	10.167.171.160 – 10.167.171.160	10.167.171.160
34	10.167.171.161/32	10.167.171.161 – 10.167.171.161	10.167.171.161
35	10.167.171.162/32	10.167.171.162 – 10.167.171.162	10.167.171.162
36	10.167.171.163/32	10.167.171.163 – 10.167.171.163	10.167.171.163
37	10.167.171.164/32	10.167.171.164 – 10.167.171.164	10.167.171.164
38	10.167.171.165/32	10.167.171.165 – 10.167.171.165	10.167.171.165
39	10.167.171.166/32	10.167.171.166 – 10.167.171.166	10.167.171.166
40	10.167.171.167/32	10.167.171.167 – 10.167.171.167	10.167.171.167
41	10.167.171.168/32	10.167.171.168 – 10.167.171.168	10.167.171.168
42	10.167.171.169/32	10.167.171.169 – 10.167.171.169	10.167.171.169
43	10.167.171.170/32	10.167.171.170 – 10.167.171.170	10.167.171.170
44	10.167.171.171/32	10.167.171.171 – 10.167.171.171	10.167.171.171
45	10.167.171.172/32	10.167.171.172 – 10.167.171.172	10.167.171.172
46	10.167.171.173/32	10.167.171.173 – 10.167.171.173	10.167.171.173
47	10.167.171.174/32	10.167.171.174 – 10.167.171.174	10.167.171.174
48	10.167.171.175/32	10.167.171.175 – 10.167.171.175	10.167.171.175
49	10.167.171.176/32	10.167.171.176 – 10.167.171.176	10.167.171.176
50	10.167.171.177/32	10.167.171.177 – 10.167.171.177	10.167.171.177
51	10.167.171.178/32	10.167.171.178 – 10.167.171.178	10.167.171.178
52	10.167.171.179/32	10.167.171.179 – 10.167.171.179	10.167.171.179
53	10.167.171.180/32	10.167.171.180 – 10.167.171.180	10.167.171.180
54	10.167.171.181/32	10.167.171.181 – 10.167.171.181	10.167.171.181
55	10.167.171.182/32	10.167.171.182 – 10.167.171.182	10.167.171.182
56	10.167.171.183/32	10.167.171.183 – 10.167.171.183	10.167.171.183
57	10.167.171.184/32	10.167.171.184 – 10.167.171.184	10.167.171.184
58	10.167.171.185/32	10.167.171.185 – 10.167.171.185	10.167.171.185
59	10.167.171.186/32	10.167.171.186 – 10.167.171.186	10.167.171.186
60	10.167.171.187/32	10.167.171.187 – 10.167.171.187	10.167.171.187
61	10.167.171.188/32	10.167.171.188 – 10.167.171.188	10.167.171.188
62	10.167.171.189/32	10.167.171.189 – 10.167.171.189	10.167.171.189
63	10.167.171.190/32	10.167.171.190 – 10.167.171.190	10.167.171.190
64	10.167.171.191/32	10.167.171.191 – 10.167.171.191	10.167.171.191
65	10.167.171.192/32	10.167.171.192 – 10.167.171.192	10.167.171.192
66	10.167.171.193/32	10.167.171.193 – 10.167.171.193	10.167.171.193
67	10.167.171.194/32	10.167.171.194 – 10.167.171.194	10.167.171.194
68	10.167.171.195/32	10.167.171.195 – 10.167.171.195	10.167.171.195
69	10.167.171.196/32	10.167.171.196 – 10.167.171.196	10.167.171.196
70	10.167.171.197/32	10.167.171.197 – 10.167.171.197	10.167.171.197
71	10.167.171.198/32	10.167.171.198 – 10.167.171.198	10.167.171.198
72	10.167.171.199/32	10.167.171.199 – 10.167.171.199	10.167.171.199
73	10.167.171.200/32	10.167.171.200 – 10.167.171.200	10.167.171.200
74	10.167.171.201/32	10.167.171.201 – 10.167.171.201	10.167.171.201
75	10.167.171.202/32	10.167.171.202 – 10.167.171.202	10.167.171.202
76	10.167.171.203/32	10.167.171.203 – 10.167.171.203	10.167.171.203
77	10.167.171.204/32	10.167.171.204 – 10.167.171.204	10.167.171.204
78	10.167.171.205/32	10.167.171.205 – 10.167.171.205	10.167.171.205
79	10.167.171.206/32	10.167.171.206 – 10.167.171.206	10.167.171.206
80	10.167.171.207/32	10.167.171.207 – 10.167.171.207	10.167.171.207
81	10.167.171.208/32	10.167.171.208 – 10.167.171.208	10.167.171.208
82	10.167.171.209/32	10.167.171.209 – 10.167.171.209	10.167.171.209
83	10.167.171.210/32	10.167.171.210 – 10.167.171.210	10.167.171.210
84	10.167.171.211/32	10.167.171.211 – 10.167.171.211	10.167.171.211
85	10.167.171.212/32	10.167.171.212 – 10.167.171.212	10.167.171.212
86	10.167.171.213/32	10.167.171.213 – 10.167.171.213	10.167.171.213
87	10.167.171.214/32	10.167.171.214 – 10.167.171.214	10.167.171.214
88	10.167.171.215/32	10.167.171.215 – 10.167.171.215	10.167.171.215
89	10.167.171.216/32	10.167.171.216 – 10.167.171.216	10.167.171.216
90	10.167.171.217/32	10.167.171.217 – 10.167.171.217	10.167.171.217
91	10.167.171.218/32	10.167.171.218 – 10.167.171.218	10.167.171.218
92	10.167.171.219/32	10.167.171.219 – 10.167.171.219	10.167.171.219
93	10.167.171.220/32	10.167.171.220 – 10.167.171.220	10.167.171.220
94	10.167.171.221/32	10.167.171.221 – 10.167.171.221	10.167.171.221
95	10.167.171.222/32	10.167.171.222 – 10.167.171.222	10.167.171.222
96	10.167.171.223/32	10.167.171.223 – 10.167.171.223	10.167.171.223
97	10.167.171.224/32	10.167.171.224 – 10.167.171.224	10.167.171.224
98	10.167.171.225/32	10.167.171.225 – 10.167.171.225	10.167.171.225
99	10.167.171.226/32	10.167.171.226 – 10.167.171.226	10.167.171.226
100	10.167.171.227/32	10.167.171.227 – 10.167.171.227	10.167.171.227
101	10.167.171.228/32	10.167.171.228 – 10.167.171.228	10.167.171.228
102	10.167.171.229/32	10.167.171.229 – 10.167.171.229	10.167.171.229
103	10.167.171.230/32	10.167.171.230 – 10.167.171.230	10.167.171.230
104	10.167.171.231/32	10.167.171.231 – 10.167.171.231	10.167.171.231
105	10.167.171.232/32	10.167.171.232 – 10.167.171.232	10.167.171.232
106	10.167.171.233/32	10.167.171.233 – 10.167.171.233	10.167.171.233
107	10.167.171.234/32	10.167.171.234 – 10.167.171.234	10.167.171.234
108	10.167.171.235/32	10.167.171.235 – 10.167.171.235	10.167.171.235
109	10.167.171.236/32	10.167.171.236 – 10.167.171.236	10.167.171.236
110	10.167.171.237/32	10.167.171.237 – 10.167.171.237	10.167.171.237
111	10.167.171.238/32	10.167.171.238 – 10.167.171.238	10.167.171.238
112	10.167.171.239/32	10.167.171.239 – 10.167.171.239	10.167.171.239
113	10.167.171.240/32	10.167.171.240 – 10.167.171.240	10.167.171.240
114	10.167.171.241/32	10.167.171.241 – 10.167.171.241	10.167.171.241
115	10.167.171.242/32	10.167.171.242 – 10.167.171.242	10.167.171.242
116	10.167.171.243/32	10.167.171.243 – 10.167.171.243	10.167.171.243
117	10.167.171.244/32	10.167.171.244 – 10.167.171.244	10.167.171.244
118	10.167.171.245/32	10.167.171.245 – 10.167.171.245	10.167.171.245
119	10.167.171.246/32	10.167.171.246 – 10.167.171.246	10.167.171.246
120	10.167.171.247/32	10.167.171.247 – 10.167.171.247	10.167.171.247
121	10.167.171.248/32	10.167.171.248 – 10.167.171.248	10.167.171.248
122	10.167.171.249/32	10.167.171.249 – 10.167.171.249	10.167.171.249
123	10.167.171.250/32	10.167.171.250 – 10.167.171.250	10.167.171.250
124	10.167.171.251/32	10.167.171.251 – 10.167.171.251	10.167.171.251
125	10.167.171.252/32	10.167.171.252 – 10.167.171.252	10.167.171.252
126	10.167.171.253/32	10.167.171.253 – 10.167.171.253	10.167.171.253
127	10.167.171.254/32	10.167.171.254 – 10.167.171.254	10.167.171.254
128	10.167.171.255/32	10.167.171.255 – 10.167.171.255	10.167.171.255

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 →