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)10.167.130.128/25

network10.167.130.128/25

broadcast10.167.130.255

first host10.167.130.129

last host10.167.130.254

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.167.130.128/25

address00001010.10100111.10000010.10000000

subnet mask11111111.11111111.11111111.10000000

network00001010.10100111.10000010.10000000

broadcast00001010.10100111.10000010.11111111

green = network part, grey = host part

hex0x0aa78280

decimal178750080

reverse dns128.130.167.10.in-addr.arpa

ipv4-mapped::ffff:aa7:8280

/25 split into /32 · 128 subnets

close ×

#	network	host range	broadcast
1	10.167.130.128/32	10.167.130.128 – 10.167.130.128	10.167.130.128
2	10.167.130.129/32	10.167.130.129 – 10.167.130.129	10.167.130.129
3	10.167.130.130/32	10.167.130.130 – 10.167.130.130	10.167.130.130
4	10.167.130.131/32	10.167.130.131 – 10.167.130.131	10.167.130.131
5	10.167.130.132/32	10.167.130.132 – 10.167.130.132	10.167.130.132
6	10.167.130.133/32	10.167.130.133 – 10.167.130.133	10.167.130.133
7	10.167.130.134/32	10.167.130.134 – 10.167.130.134	10.167.130.134
8	10.167.130.135/32	10.167.130.135 – 10.167.130.135	10.167.130.135
9	10.167.130.136/32	10.167.130.136 – 10.167.130.136	10.167.130.136
10	10.167.130.137/32	10.167.130.137 – 10.167.130.137	10.167.130.137
11	10.167.130.138/32	10.167.130.138 – 10.167.130.138	10.167.130.138
12	10.167.130.139/32	10.167.130.139 – 10.167.130.139	10.167.130.139
13	10.167.130.140/32	10.167.130.140 – 10.167.130.140	10.167.130.140
14	10.167.130.141/32	10.167.130.141 – 10.167.130.141	10.167.130.141
15	10.167.130.142/32	10.167.130.142 – 10.167.130.142	10.167.130.142
16	10.167.130.143/32	10.167.130.143 – 10.167.130.143	10.167.130.143
17	10.167.130.144/32	10.167.130.144 – 10.167.130.144	10.167.130.144
18	10.167.130.145/32	10.167.130.145 – 10.167.130.145	10.167.130.145
19	10.167.130.146/32	10.167.130.146 – 10.167.130.146	10.167.130.146
20	10.167.130.147/32	10.167.130.147 – 10.167.130.147	10.167.130.147
21	10.167.130.148/32	10.167.130.148 – 10.167.130.148	10.167.130.148
22	10.167.130.149/32	10.167.130.149 – 10.167.130.149	10.167.130.149
23	10.167.130.150/32	10.167.130.150 – 10.167.130.150	10.167.130.150
24	10.167.130.151/32	10.167.130.151 – 10.167.130.151	10.167.130.151
25	10.167.130.152/32	10.167.130.152 – 10.167.130.152	10.167.130.152
26	10.167.130.153/32	10.167.130.153 – 10.167.130.153	10.167.130.153
27	10.167.130.154/32	10.167.130.154 – 10.167.130.154	10.167.130.154
28	10.167.130.155/32	10.167.130.155 – 10.167.130.155	10.167.130.155
29	10.167.130.156/32	10.167.130.156 – 10.167.130.156	10.167.130.156
30	10.167.130.157/32	10.167.130.157 – 10.167.130.157	10.167.130.157
31	10.167.130.158/32	10.167.130.158 – 10.167.130.158	10.167.130.158
32	10.167.130.159/32	10.167.130.159 – 10.167.130.159	10.167.130.159
33	10.167.130.160/32	10.167.130.160 – 10.167.130.160	10.167.130.160
34	10.167.130.161/32	10.167.130.161 – 10.167.130.161	10.167.130.161
35	10.167.130.162/32	10.167.130.162 – 10.167.130.162	10.167.130.162
36	10.167.130.163/32	10.167.130.163 – 10.167.130.163	10.167.130.163
37	10.167.130.164/32	10.167.130.164 – 10.167.130.164	10.167.130.164
38	10.167.130.165/32	10.167.130.165 – 10.167.130.165	10.167.130.165
39	10.167.130.166/32	10.167.130.166 – 10.167.130.166	10.167.130.166
40	10.167.130.167/32	10.167.130.167 – 10.167.130.167	10.167.130.167
41	10.167.130.168/32	10.167.130.168 – 10.167.130.168	10.167.130.168
42	10.167.130.169/32	10.167.130.169 – 10.167.130.169	10.167.130.169
43	10.167.130.170/32	10.167.130.170 – 10.167.130.170	10.167.130.170
44	10.167.130.171/32	10.167.130.171 – 10.167.130.171	10.167.130.171
45	10.167.130.172/32	10.167.130.172 – 10.167.130.172	10.167.130.172
46	10.167.130.173/32	10.167.130.173 – 10.167.130.173	10.167.130.173
47	10.167.130.174/32	10.167.130.174 – 10.167.130.174	10.167.130.174
48	10.167.130.175/32	10.167.130.175 – 10.167.130.175	10.167.130.175
49	10.167.130.176/32	10.167.130.176 – 10.167.130.176	10.167.130.176
50	10.167.130.177/32	10.167.130.177 – 10.167.130.177	10.167.130.177
51	10.167.130.178/32	10.167.130.178 – 10.167.130.178	10.167.130.178
52	10.167.130.179/32	10.167.130.179 – 10.167.130.179	10.167.130.179
53	10.167.130.180/32	10.167.130.180 – 10.167.130.180	10.167.130.180
54	10.167.130.181/32	10.167.130.181 – 10.167.130.181	10.167.130.181
55	10.167.130.182/32	10.167.130.182 – 10.167.130.182	10.167.130.182
56	10.167.130.183/32	10.167.130.183 – 10.167.130.183	10.167.130.183
57	10.167.130.184/32	10.167.130.184 – 10.167.130.184	10.167.130.184
58	10.167.130.185/32	10.167.130.185 – 10.167.130.185	10.167.130.185
59	10.167.130.186/32	10.167.130.186 – 10.167.130.186	10.167.130.186
60	10.167.130.187/32	10.167.130.187 – 10.167.130.187	10.167.130.187
61	10.167.130.188/32	10.167.130.188 – 10.167.130.188	10.167.130.188
62	10.167.130.189/32	10.167.130.189 – 10.167.130.189	10.167.130.189
63	10.167.130.190/32	10.167.130.190 – 10.167.130.190	10.167.130.190
64	10.167.130.191/32	10.167.130.191 – 10.167.130.191	10.167.130.191
65	10.167.130.192/32	10.167.130.192 – 10.167.130.192	10.167.130.192
66	10.167.130.193/32	10.167.130.193 – 10.167.130.193	10.167.130.193
67	10.167.130.194/32	10.167.130.194 – 10.167.130.194	10.167.130.194
68	10.167.130.195/32	10.167.130.195 – 10.167.130.195	10.167.130.195
69	10.167.130.196/32	10.167.130.196 – 10.167.130.196	10.167.130.196
70	10.167.130.197/32	10.167.130.197 – 10.167.130.197	10.167.130.197
71	10.167.130.198/32	10.167.130.198 – 10.167.130.198	10.167.130.198
72	10.167.130.199/32	10.167.130.199 – 10.167.130.199	10.167.130.199
73	10.167.130.200/32	10.167.130.200 – 10.167.130.200	10.167.130.200
74	10.167.130.201/32	10.167.130.201 – 10.167.130.201	10.167.130.201
75	10.167.130.202/32	10.167.130.202 – 10.167.130.202	10.167.130.202
76	10.167.130.203/32	10.167.130.203 – 10.167.130.203	10.167.130.203
77	10.167.130.204/32	10.167.130.204 – 10.167.130.204	10.167.130.204
78	10.167.130.205/32	10.167.130.205 – 10.167.130.205	10.167.130.205
79	10.167.130.206/32	10.167.130.206 – 10.167.130.206	10.167.130.206
80	10.167.130.207/32	10.167.130.207 – 10.167.130.207	10.167.130.207
81	10.167.130.208/32	10.167.130.208 – 10.167.130.208	10.167.130.208
82	10.167.130.209/32	10.167.130.209 – 10.167.130.209	10.167.130.209
83	10.167.130.210/32	10.167.130.210 – 10.167.130.210	10.167.130.210
84	10.167.130.211/32	10.167.130.211 – 10.167.130.211	10.167.130.211
85	10.167.130.212/32	10.167.130.212 – 10.167.130.212	10.167.130.212
86	10.167.130.213/32	10.167.130.213 – 10.167.130.213	10.167.130.213
87	10.167.130.214/32	10.167.130.214 – 10.167.130.214	10.167.130.214
88	10.167.130.215/32	10.167.130.215 – 10.167.130.215	10.167.130.215
89	10.167.130.216/32	10.167.130.216 – 10.167.130.216	10.167.130.216
90	10.167.130.217/32	10.167.130.217 – 10.167.130.217	10.167.130.217
91	10.167.130.218/32	10.167.130.218 – 10.167.130.218	10.167.130.218
92	10.167.130.219/32	10.167.130.219 – 10.167.130.219	10.167.130.219
93	10.167.130.220/32	10.167.130.220 – 10.167.130.220	10.167.130.220
94	10.167.130.221/32	10.167.130.221 – 10.167.130.221	10.167.130.221
95	10.167.130.222/32	10.167.130.222 – 10.167.130.222	10.167.130.222
96	10.167.130.223/32	10.167.130.223 – 10.167.130.223	10.167.130.223
97	10.167.130.224/32	10.167.130.224 – 10.167.130.224	10.167.130.224
98	10.167.130.225/32	10.167.130.225 – 10.167.130.225	10.167.130.225
99	10.167.130.226/32	10.167.130.226 – 10.167.130.226	10.167.130.226
100	10.167.130.227/32	10.167.130.227 – 10.167.130.227	10.167.130.227
101	10.167.130.228/32	10.167.130.228 – 10.167.130.228	10.167.130.228
102	10.167.130.229/32	10.167.130.229 – 10.167.130.229	10.167.130.229
103	10.167.130.230/32	10.167.130.230 – 10.167.130.230	10.167.130.230
104	10.167.130.231/32	10.167.130.231 – 10.167.130.231	10.167.130.231
105	10.167.130.232/32	10.167.130.232 – 10.167.130.232	10.167.130.232
106	10.167.130.233/32	10.167.130.233 – 10.167.130.233	10.167.130.233
107	10.167.130.234/32	10.167.130.234 – 10.167.130.234	10.167.130.234
108	10.167.130.235/32	10.167.130.235 – 10.167.130.235	10.167.130.235
109	10.167.130.236/32	10.167.130.236 – 10.167.130.236	10.167.130.236
110	10.167.130.237/32	10.167.130.237 – 10.167.130.237	10.167.130.237
111	10.167.130.238/32	10.167.130.238 – 10.167.130.238	10.167.130.238
112	10.167.130.239/32	10.167.130.239 – 10.167.130.239	10.167.130.239
113	10.167.130.240/32	10.167.130.240 – 10.167.130.240	10.167.130.240
114	10.167.130.241/32	10.167.130.241 – 10.167.130.241	10.167.130.241
115	10.167.130.242/32	10.167.130.242 – 10.167.130.242	10.167.130.242
116	10.167.130.243/32	10.167.130.243 – 10.167.130.243	10.167.130.243
117	10.167.130.244/32	10.167.130.244 – 10.167.130.244	10.167.130.244
118	10.167.130.245/32	10.167.130.245 – 10.167.130.245	10.167.130.245
119	10.167.130.246/32	10.167.130.246 – 10.167.130.246	10.167.130.246
120	10.167.130.247/32	10.167.130.247 – 10.167.130.247	10.167.130.247
121	10.167.130.248/32	10.167.130.248 – 10.167.130.248	10.167.130.248
122	10.167.130.249/32	10.167.130.249 – 10.167.130.249	10.167.130.249
123	10.167.130.250/32	10.167.130.250 – 10.167.130.250	10.167.130.250
124	10.167.130.251/32	10.167.130.251 – 10.167.130.251	10.167.130.251
125	10.167.130.252/32	10.167.130.252 – 10.167.130.252	10.167.130.252
126	10.167.130.253/32	10.167.130.253 – 10.167.130.253	10.167.130.253
127	10.167.130.254/32	10.167.130.254 – 10.167.130.254	10.167.130.254
128	10.167.130.255/32	10.167.130.255 – 10.167.130.255	10.167.130.255

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 →