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)10.167.172.128/25

network10.167.172.128/25

broadcast10.167.172.255

first host10.167.172.129

last host10.167.172.254

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.167.172.128/25

address00001010.10100111.10101100.10000000

subnet mask11111111.11111111.11111111.10000000

network00001010.10100111.10101100.10000000

broadcast00001010.10100111.10101100.11111111

green = network part, grey = host part

hex0x0aa7ac80

decimal178760832

reverse dns128.172.167.10.in-addr.arpa

ipv4-mapped::ffff:aa7:ac80

/25 split into /32 · 128 subnets

close ×

#	network	host range	broadcast
1	10.167.172.128/32	10.167.172.128 – 10.167.172.128	10.167.172.128
2	10.167.172.129/32	10.167.172.129 – 10.167.172.129	10.167.172.129
3	10.167.172.130/32	10.167.172.130 – 10.167.172.130	10.167.172.130
4	10.167.172.131/32	10.167.172.131 – 10.167.172.131	10.167.172.131
5	10.167.172.132/32	10.167.172.132 – 10.167.172.132	10.167.172.132
6	10.167.172.133/32	10.167.172.133 – 10.167.172.133	10.167.172.133
7	10.167.172.134/32	10.167.172.134 – 10.167.172.134	10.167.172.134
8	10.167.172.135/32	10.167.172.135 – 10.167.172.135	10.167.172.135
9	10.167.172.136/32	10.167.172.136 – 10.167.172.136	10.167.172.136
10	10.167.172.137/32	10.167.172.137 – 10.167.172.137	10.167.172.137
11	10.167.172.138/32	10.167.172.138 – 10.167.172.138	10.167.172.138
12	10.167.172.139/32	10.167.172.139 – 10.167.172.139	10.167.172.139
13	10.167.172.140/32	10.167.172.140 – 10.167.172.140	10.167.172.140
14	10.167.172.141/32	10.167.172.141 – 10.167.172.141	10.167.172.141
15	10.167.172.142/32	10.167.172.142 – 10.167.172.142	10.167.172.142
16	10.167.172.143/32	10.167.172.143 – 10.167.172.143	10.167.172.143
17	10.167.172.144/32	10.167.172.144 – 10.167.172.144	10.167.172.144
18	10.167.172.145/32	10.167.172.145 – 10.167.172.145	10.167.172.145
19	10.167.172.146/32	10.167.172.146 – 10.167.172.146	10.167.172.146
20	10.167.172.147/32	10.167.172.147 – 10.167.172.147	10.167.172.147
21	10.167.172.148/32	10.167.172.148 – 10.167.172.148	10.167.172.148
22	10.167.172.149/32	10.167.172.149 – 10.167.172.149	10.167.172.149
23	10.167.172.150/32	10.167.172.150 – 10.167.172.150	10.167.172.150
24	10.167.172.151/32	10.167.172.151 – 10.167.172.151	10.167.172.151
25	10.167.172.152/32	10.167.172.152 – 10.167.172.152	10.167.172.152
26	10.167.172.153/32	10.167.172.153 – 10.167.172.153	10.167.172.153
27	10.167.172.154/32	10.167.172.154 – 10.167.172.154	10.167.172.154
28	10.167.172.155/32	10.167.172.155 – 10.167.172.155	10.167.172.155
29	10.167.172.156/32	10.167.172.156 – 10.167.172.156	10.167.172.156
30	10.167.172.157/32	10.167.172.157 – 10.167.172.157	10.167.172.157
31	10.167.172.158/32	10.167.172.158 – 10.167.172.158	10.167.172.158
32	10.167.172.159/32	10.167.172.159 – 10.167.172.159	10.167.172.159
33	10.167.172.160/32	10.167.172.160 – 10.167.172.160	10.167.172.160
34	10.167.172.161/32	10.167.172.161 – 10.167.172.161	10.167.172.161
35	10.167.172.162/32	10.167.172.162 – 10.167.172.162	10.167.172.162
36	10.167.172.163/32	10.167.172.163 – 10.167.172.163	10.167.172.163
37	10.167.172.164/32	10.167.172.164 – 10.167.172.164	10.167.172.164
38	10.167.172.165/32	10.167.172.165 – 10.167.172.165	10.167.172.165
39	10.167.172.166/32	10.167.172.166 – 10.167.172.166	10.167.172.166
40	10.167.172.167/32	10.167.172.167 – 10.167.172.167	10.167.172.167
41	10.167.172.168/32	10.167.172.168 – 10.167.172.168	10.167.172.168
42	10.167.172.169/32	10.167.172.169 – 10.167.172.169	10.167.172.169
43	10.167.172.170/32	10.167.172.170 – 10.167.172.170	10.167.172.170
44	10.167.172.171/32	10.167.172.171 – 10.167.172.171	10.167.172.171
45	10.167.172.172/32	10.167.172.172 – 10.167.172.172	10.167.172.172
46	10.167.172.173/32	10.167.172.173 – 10.167.172.173	10.167.172.173
47	10.167.172.174/32	10.167.172.174 – 10.167.172.174	10.167.172.174
48	10.167.172.175/32	10.167.172.175 – 10.167.172.175	10.167.172.175
49	10.167.172.176/32	10.167.172.176 – 10.167.172.176	10.167.172.176
50	10.167.172.177/32	10.167.172.177 – 10.167.172.177	10.167.172.177
51	10.167.172.178/32	10.167.172.178 – 10.167.172.178	10.167.172.178
52	10.167.172.179/32	10.167.172.179 – 10.167.172.179	10.167.172.179
53	10.167.172.180/32	10.167.172.180 – 10.167.172.180	10.167.172.180
54	10.167.172.181/32	10.167.172.181 – 10.167.172.181	10.167.172.181
55	10.167.172.182/32	10.167.172.182 – 10.167.172.182	10.167.172.182
56	10.167.172.183/32	10.167.172.183 – 10.167.172.183	10.167.172.183
57	10.167.172.184/32	10.167.172.184 – 10.167.172.184	10.167.172.184
58	10.167.172.185/32	10.167.172.185 – 10.167.172.185	10.167.172.185
59	10.167.172.186/32	10.167.172.186 – 10.167.172.186	10.167.172.186
60	10.167.172.187/32	10.167.172.187 – 10.167.172.187	10.167.172.187
61	10.167.172.188/32	10.167.172.188 – 10.167.172.188	10.167.172.188
62	10.167.172.189/32	10.167.172.189 – 10.167.172.189	10.167.172.189
63	10.167.172.190/32	10.167.172.190 – 10.167.172.190	10.167.172.190
64	10.167.172.191/32	10.167.172.191 – 10.167.172.191	10.167.172.191
65	10.167.172.192/32	10.167.172.192 – 10.167.172.192	10.167.172.192
66	10.167.172.193/32	10.167.172.193 – 10.167.172.193	10.167.172.193
67	10.167.172.194/32	10.167.172.194 – 10.167.172.194	10.167.172.194
68	10.167.172.195/32	10.167.172.195 – 10.167.172.195	10.167.172.195
69	10.167.172.196/32	10.167.172.196 – 10.167.172.196	10.167.172.196
70	10.167.172.197/32	10.167.172.197 – 10.167.172.197	10.167.172.197
71	10.167.172.198/32	10.167.172.198 – 10.167.172.198	10.167.172.198
72	10.167.172.199/32	10.167.172.199 – 10.167.172.199	10.167.172.199
73	10.167.172.200/32	10.167.172.200 – 10.167.172.200	10.167.172.200
74	10.167.172.201/32	10.167.172.201 – 10.167.172.201	10.167.172.201
75	10.167.172.202/32	10.167.172.202 – 10.167.172.202	10.167.172.202
76	10.167.172.203/32	10.167.172.203 – 10.167.172.203	10.167.172.203
77	10.167.172.204/32	10.167.172.204 – 10.167.172.204	10.167.172.204
78	10.167.172.205/32	10.167.172.205 – 10.167.172.205	10.167.172.205
79	10.167.172.206/32	10.167.172.206 – 10.167.172.206	10.167.172.206
80	10.167.172.207/32	10.167.172.207 – 10.167.172.207	10.167.172.207
81	10.167.172.208/32	10.167.172.208 – 10.167.172.208	10.167.172.208
82	10.167.172.209/32	10.167.172.209 – 10.167.172.209	10.167.172.209
83	10.167.172.210/32	10.167.172.210 – 10.167.172.210	10.167.172.210
84	10.167.172.211/32	10.167.172.211 – 10.167.172.211	10.167.172.211
85	10.167.172.212/32	10.167.172.212 – 10.167.172.212	10.167.172.212
86	10.167.172.213/32	10.167.172.213 – 10.167.172.213	10.167.172.213
87	10.167.172.214/32	10.167.172.214 – 10.167.172.214	10.167.172.214
88	10.167.172.215/32	10.167.172.215 – 10.167.172.215	10.167.172.215
89	10.167.172.216/32	10.167.172.216 – 10.167.172.216	10.167.172.216
90	10.167.172.217/32	10.167.172.217 – 10.167.172.217	10.167.172.217
91	10.167.172.218/32	10.167.172.218 – 10.167.172.218	10.167.172.218
92	10.167.172.219/32	10.167.172.219 – 10.167.172.219	10.167.172.219
93	10.167.172.220/32	10.167.172.220 – 10.167.172.220	10.167.172.220
94	10.167.172.221/32	10.167.172.221 – 10.167.172.221	10.167.172.221
95	10.167.172.222/32	10.167.172.222 – 10.167.172.222	10.167.172.222
96	10.167.172.223/32	10.167.172.223 – 10.167.172.223	10.167.172.223
97	10.167.172.224/32	10.167.172.224 – 10.167.172.224	10.167.172.224
98	10.167.172.225/32	10.167.172.225 – 10.167.172.225	10.167.172.225
99	10.167.172.226/32	10.167.172.226 – 10.167.172.226	10.167.172.226
100	10.167.172.227/32	10.167.172.227 – 10.167.172.227	10.167.172.227
101	10.167.172.228/32	10.167.172.228 – 10.167.172.228	10.167.172.228
102	10.167.172.229/32	10.167.172.229 – 10.167.172.229	10.167.172.229
103	10.167.172.230/32	10.167.172.230 – 10.167.172.230	10.167.172.230
104	10.167.172.231/32	10.167.172.231 – 10.167.172.231	10.167.172.231
105	10.167.172.232/32	10.167.172.232 – 10.167.172.232	10.167.172.232
106	10.167.172.233/32	10.167.172.233 – 10.167.172.233	10.167.172.233
107	10.167.172.234/32	10.167.172.234 – 10.167.172.234	10.167.172.234
108	10.167.172.235/32	10.167.172.235 – 10.167.172.235	10.167.172.235
109	10.167.172.236/32	10.167.172.236 – 10.167.172.236	10.167.172.236
110	10.167.172.237/32	10.167.172.237 – 10.167.172.237	10.167.172.237
111	10.167.172.238/32	10.167.172.238 – 10.167.172.238	10.167.172.238
112	10.167.172.239/32	10.167.172.239 – 10.167.172.239	10.167.172.239
113	10.167.172.240/32	10.167.172.240 – 10.167.172.240	10.167.172.240
114	10.167.172.241/32	10.167.172.241 – 10.167.172.241	10.167.172.241
115	10.167.172.242/32	10.167.172.242 – 10.167.172.242	10.167.172.242
116	10.167.172.243/32	10.167.172.243 – 10.167.172.243	10.167.172.243
117	10.167.172.244/32	10.167.172.244 – 10.167.172.244	10.167.172.244
118	10.167.172.245/32	10.167.172.245 – 10.167.172.245	10.167.172.245
119	10.167.172.246/32	10.167.172.246 – 10.167.172.246	10.167.172.246
120	10.167.172.247/32	10.167.172.247 – 10.167.172.247	10.167.172.247
121	10.167.172.248/32	10.167.172.248 – 10.167.172.248	10.167.172.248
122	10.167.172.249/32	10.167.172.249 – 10.167.172.249	10.167.172.249
123	10.167.172.250/32	10.167.172.250 – 10.167.172.250	10.167.172.250
124	10.167.172.251/32	10.167.172.251 – 10.167.172.251	10.167.172.251
125	10.167.172.252/32	10.167.172.252 – 10.167.172.252	10.167.172.252
126	10.167.172.253/32	10.167.172.253 – 10.167.172.253	10.167.172.253
127	10.167.172.254/32	10.167.172.254 – 10.167.172.254	10.167.172.254
128	10.167.172.255/32	10.167.172.255 – 10.167.172.255	10.167.172.255

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 →