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)10.31.167.128/25

network10.31.167.128/25

broadcast10.31.167.255

first host10.31.167.129

last host10.31.167.254

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.31.167.128/25

address00001010.00011111.10100111.10000000

subnet mask11111111.11111111.11111111.10000000

network00001010.00011111.10100111.10000000

broadcast00001010.00011111.10100111.11111111

green = network part, grey = host part

hex0x0a1fa780

decimal169846656

reverse dns128.167.31.10.in-addr.arpa

ipv4-mapped::ffff:a1f:a780

/25 split into /32 · 128 subnets

close ×

#	network	host range	broadcast
1	10.31.167.128/32	10.31.167.128 – 10.31.167.128	10.31.167.128
2	10.31.167.129/32	10.31.167.129 – 10.31.167.129	10.31.167.129
3	10.31.167.130/32	10.31.167.130 – 10.31.167.130	10.31.167.130
4	10.31.167.131/32	10.31.167.131 – 10.31.167.131	10.31.167.131
5	10.31.167.132/32	10.31.167.132 – 10.31.167.132	10.31.167.132
6	10.31.167.133/32	10.31.167.133 – 10.31.167.133	10.31.167.133
7	10.31.167.134/32	10.31.167.134 – 10.31.167.134	10.31.167.134
8	10.31.167.135/32	10.31.167.135 – 10.31.167.135	10.31.167.135
9	10.31.167.136/32	10.31.167.136 – 10.31.167.136	10.31.167.136
10	10.31.167.137/32	10.31.167.137 – 10.31.167.137	10.31.167.137
11	10.31.167.138/32	10.31.167.138 – 10.31.167.138	10.31.167.138
12	10.31.167.139/32	10.31.167.139 – 10.31.167.139	10.31.167.139
13	10.31.167.140/32	10.31.167.140 – 10.31.167.140	10.31.167.140
14	10.31.167.141/32	10.31.167.141 – 10.31.167.141	10.31.167.141
15	10.31.167.142/32	10.31.167.142 – 10.31.167.142	10.31.167.142
16	10.31.167.143/32	10.31.167.143 – 10.31.167.143	10.31.167.143
17	10.31.167.144/32	10.31.167.144 – 10.31.167.144	10.31.167.144
18	10.31.167.145/32	10.31.167.145 – 10.31.167.145	10.31.167.145
19	10.31.167.146/32	10.31.167.146 – 10.31.167.146	10.31.167.146
20	10.31.167.147/32	10.31.167.147 – 10.31.167.147	10.31.167.147
21	10.31.167.148/32	10.31.167.148 – 10.31.167.148	10.31.167.148
22	10.31.167.149/32	10.31.167.149 – 10.31.167.149	10.31.167.149
23	10.31.167.150/32	10.31.167.150 – 10.31.167.150	10.31.167.150
24	10.31.167.151/32	10.31.167.151 – 10.31.167.151	10.31.167.151
25	10.31.167.152/32	10.31.167.152 – 10.31.167.152	10.31.167.152
26	10.31.167.153/32	10.31.167.153 – 10.31.167.153	10.31.167.153
27	10.31.167.154/32	10.31.167.154 – 10.31.167.154	10.31.167.154
28	10.31.167.155/32	10.31.167.155 – 10.31.167.155	10.31.167.155
29	10.31.167.156/32	10.31.167.156 – 10.31.167.156	10.31.167.156
30	10.31.167.157/32	10.31.167.157 – 10.31.167.157	10.31.167.157
31	10.31.167.158/32	10.31.167.158 – 10.31.167.158	10.31.167.158
32	10.31.167.159/32	10.31.167.159 – 10.31.167.159	10.31.167.159
33	10.31.167.160/32	10.31.167.160 – 10.31.167.160	10.31.167.160
34	10.31.167.161/32	10.31.167.161 – 10.31.167.161	10.31.167.161
35	10.31.167.162/32	10.31.167.162 – 10.31.167.162	10.31.167.162
36	10.31.167.163/32	10.31.167.163 – 10.31.167.163	10.31.167.163
37	10.31.167.164/32	10.31.167.164 – 10.31.167.164	10.31.167.164
38	10.31.167.165/32	10.31.167.165 – 10.31.167.165	10.31.167.165
39	10.31.167.166/32	10.31.167.166 – 10.31.167.166	10.31.167.166
40	10.31.167.167/32	10.31.167.167 – 10.31.167.167	10.31.167.167
41	10.31.167.168/32	10.31.167.168 – 10.31.167.168	10.31.167.168
42	10.31.167.169/32	10.31.167.169 – 10.31.167.169	10.31.167.169
43	10.31.167.170/32	10.31.167.170 – 10.31.167.170	10.31.167.170
44	10.31.167.171/32	10.31.167.171 – 10.31.167.171	10.31.167.171
45	10.31.167.172/32	10.31.167.172 – 10.31.167.172	10.31.167.172
46	10.31.167.173/32	10.31.167.173 – 10.31.167.173	10.31.167.173
47	10.31.167.174/32	10.31.167.174 – 10.31.167.174	10.31.167.174
48	10.31.167.175/32	10.31.167.175 – 10.31.167.175	10.31.167.175
49	10.31.167.176/32	10.31.167.176 – 10.31.167.176	10.31.167.176
50	10.31.167.177/32	10.31.167.177 – 10.31.167.177	10.31.167.177
51	10.31.167.178/32	10.31.167.178 – 10.31.167.178	10.31.167.178
52	10.31.167.179/32	10.31.167.179 – 10.31.167.179	10.31.167.179
53	10.31.167.180/32	10.31.167.180 – 10.31.167.180	10.31.167.180
54	10.31.167.181/32	10.31.167.181 – 10.31.167.181	10.31.167.181
55	10.31.167.182/32	10.31.167.182 – 10.31.167.182	10.31.167.182
56	10.31.167.183/32	10.31.167.183 – 10.31.167.183	10.31.167.183
57	10.31.167.184/32	10.31.167.184 – 10.31.167.184	10.31.167.184
58	10.31.167.185/32	10.31.167.185 – 10.31.167.185	10.31.167.185
59	10.31.167.186/32	10.31.167.186 – 10.31.167.186	10.31.167.186
60	10.31.167.187/32	10.31.167.187 – 10.31.167.187	10.31.167.187
61	10.31.167.188/32	10.31.167.188 – 10.31.167.188	10.31.167.188
62	10.31.167.189/32	10.31.167.189 – 10.31.167.189	10.31.167.189
63	10.31.167.190/32	10.31.167.190 – 10.31.167.190	10.31.167.190
64	10.31.167.191/32	10.31.167.191 – 10.31.167.191	10.31.167.191
65	10.31.167.192/32	10.31.167.192 – 10.31.167.192	10.31.167.192
66	10.31.167.193/32	10.31.167.193 – 10.31.167.193	10.31.167.193
67	10.31.167.194/32	10.31.167.194 – 10.31.167.194	10.31.167.194
68	10.31.167.195/32	10.31.167.195 – 10.31.167.195	10.31.167.195
69	10.31.167.196/32	10.31.167.196 – 10.31.167.196	10.31.167.196
70	10.31.167.197/32	10.31.167.197 – 10.31.167.197	10.31.167.197
71	10.31.167.198/32	10.31.167.198 – 10.31.167.198	10.31.167.198
72	10.31.167.199/32	10.31.167.199 – 10.31.167.199	10.31.167.199
73	10.31.167.200/32	10.31.167.200 – 10.31.167.200	10.31.167.200
74	10.31.167.201/32	10.31.167.201 – 10.31.167.201	10.31.167.201
75	10.31.167.202/32	10.31.167.202 – 10.31.167.202	10.31.167.202
76	10.31.167.203/32	10.31.167.203 – 10.31.167.203	10.31.167.203
77	10.31.167.204/32	10.31.167.204 – 10.31.167.204	10.31.167.204
78	10.31.167.205/32	10.31.167.205 – 10.31.167.205	10.31.167.205
79	10.31.167.206/32	10.31.167.206 – 10.31.167.206	10.31.167.206
80	10.31.167.207/32	10.31.167.207 – 10.31.167.207	10.31.167.207
81	10.31.167.208/32	10.31.167.208 – 10.31.167.208	10.31.167.208
82	10.31.167.209/32	10.31.167.209 – 10.31.167.209	10.31.167.209
83	10.31.167.210/32	10.31.167.210 – 10.31.167.210	10.31.167.210
84	10.31.167.211/32	10.31.167.211 – 10.31.167.211	10.31.167.211
85	10.31.167.212/32	10.31.167.212 – 10.31.167.212	10.31.167.212
86	10.31.167.213/32	10.31.167.213 – 10.31.167.213	10.31.167.213
87	10.31.167.214/32	10.31.167.214 – 10.31.167.214	10.31.167.214
88	10.31.167.215/32	10.31.167.215 – 10.31.167.215	10.31.167.215
89	10.31.167.216/32	10.31.167.216 – 10.31.167.216	10.31.167.216
90	10.31.167.217/32	10.31.167.217 – 10.31.167.217	10.31.167.217
91	10.31.167.218/32	10.31.167.218 – 10.31.167.218	10.31.167.218
92	10.31.167.219/32	10.31.167.219 – 10.31.167.219	10.31.167.219
93	10.31.167.220/32	10.31.167.220 – 10.31.167.220	10.31.167.220
94	10.31.167.221/32	10.31.167.221 – 10.31.167.221	10.31.167.221
95	10.31.167.222/32	10.31.167.222 – 10.31.167.222	10.31.167.222
96	10.31.167.223/32	10.31.167.223 – 10.31.167.223	10.31.167.223
97	10.31.167.224/32	10.31.167.224 – 10.31.167.224	10.31.167.224
98	10.31.167.225/32	10.31.167.225 – 10.31.167.225	10.31.167.225
99	10.31.167.226/32	10.31.167.226 – 10.31.167.226	10.31.167.226
100	10.31.167.227/32	10.31.167.227 – 10.31.167.227	10.31.167.227
101	10.31.167.228/32	10.31.167.228 – 10.31.167.228	10.31.167.228
102	10.31.167.229/32	10.31.167.229 – 10.31.167.229	10.31.167.229
103	10.31.167.230/32	10.31.167.230 – 10.31.167.230	10.31.167.230
104	10.31.167.231/32	10.31.167.231 – 10.31.167.231	10.31.167.231
105	10.31.167.232/32	10.31.167.232 – 10.31.167.232	10.31.167.232
106	10.31.167.233/32	10.31.167.233 – 10.31.167.233	10.31.167.233
107	10.31.167.234/32	10.31.167.234 – 10.31.167.234	10.31.167.234
108	10.31.167.235/32	10.31.167.235 – 10.31.167.235	10.31.167.235
109	10.31.167.236/32	10.31.167.236 – 10.31.167.236	10.31.167.236
110	10.31.167.237/32	10.31.167.237 – 10.31.167.237	10.31.167.237
111	10.31.167.238/32	10.31.167.238 – 10.31.167.238	10.31.167.238
112	10.31.167.239/32	10.31.167.239 – 10.31.167.239	10.31.167.239
113	10.31.167.240/32	10.31.167.240 – 10.31.167.240	10.31.167.240
114	10.31.167.241/32	10.31.167.241 – 10.31.167.241	10.31.167.241
115	10.31.167.242/32	10.31.167.242 – 10.31.167.242	10.31.167.242
116	10.31.167.243/32	10.31.167.243 – 10.31.167.243	10.31.167.243
117	10.31.167.244/32	10.31.167.244 – 10.31.167.244	10.31.167.244
118	10.31.167.245/32	10.31.167.245 – 10.31.167.245	10.31.167.245
119	10.31.167.246/32	10.31.167.246 – 10.31.167.246	10.31.167.246
120	10.31.167.247/32	10.31.167.247 – 10.31.167.247	10.31.167.247
121	10.31.167.248/32	10.31.167.248 – 10.31.167.248	10.31.167.248
122	10.31.167.249/32	10.31.167.249 – 10.31.167.249	10.31.167.249
123	10.31.167.250/32	10.31.167.250 – 10.31.167.250	10.31.167.250
124	10.31.167.251/32	10.31.167.251 – 10.31.167.251	10.31.167.251
125	10.31.167.252/32	10.31.167.252 – 10.31.167.252	10.31.167.252
126	10.31.167.253/32	10.31.167.253 – 10.31.167.253	10.31.167.253
127	10.31.167.254/32	10.31.167.254 – 10.31.167.254	10.31.167.254
128	10.31.167.255/32	10.31.167.255 – 10.31.167.255	10.31.167.255

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 →