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)10.2.182.128/25

network10.2.182.128/25

broadcast10.2.182.255

first host10.2.182.129

last host10.2.182.254

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.2.182.128/25

address00001010.00000010.10110110.10000000

subnet mask11111111.11111111.11111111.10000000

network00001010.00000010.10110110.10000000

broadcast00001010.00000010.10110110.11111111

green = network part, grey = host part

hex0x0a02b680

decimal167949952

reverse dns128.182.2.10.in-addr.arpa

ipv4-mapped::ffff:a02:b680

/25 split into /32 · 128 subnets

close ×

#	network	host range	broadcast
1	10.2.182.128/32	10.2.182.128 – 10.2.182.128	10.2.182.128
2	10.2.182.129/32	10.2.182.129 – 10.2.182.129	10.2.182.129
3	10.2.182.130/32	10.2.182.130 – 10.2.182.130	10.2.182.130
4	10.2.182.131/32	10.2.182.131 – 10.2.182.131	10.2.182.131
5	10.2.182.132/32	10.2.182.132 – 10.2.182.132	10.2.182.132
6	10.2.182.133/32	10.2.182.133 – 10.2.182.133	10.2.182.133
7	10.2.182.134/32	10.2.182.134 – 10.2.182.134	10.2.182.134
8	10.2.182.135/32	10.2.182.135 – 10.2.182.135	10.2.182.135
9	10.2.182.136/32	10.2.182.136 – 10.2.182.136	10.2.182.136
10	10.2.182.137/32	10.2.182.137 – 10.2.182.137	10.2.182.137
11	10.2.182.138/32	10.2.182.138 – 10.2.182.138	10.2.182.138
12	10.2.182.139/32	10.2.182.139 – 10.2.182.139	10.2.182.139
13	10.2.182.140/32	10.2.182.140 – 10.2.182.140	10.2.182.140
14	10.2.182.141/32	10.2.182.141 – 10.2.182.141	10.2.182.141
15	10.2.182.142/32	10.2.182.142 – 10.2.182.142	10.2.182.142
16	10.2.182.143/32	10.2.182.143 – 10.2.182.143	10.2.182.143
17	10.2.182.144/32	10.2.182.144 – 10.2.182.144	10.2.182.144
18	10.2.182.145/32	10.2.182.145 – 10.2.182.145	10.2.182.145
19	10.2.182.146/32	10.2.182.146 – 10.2.182.146	10.2.182.146
20	10.2.182.147/32	10.2.182.147 – 10.2.182.147	10.2.182.147
21	10.2.182.148/32	10.2.182.148 – 10.2.182.148	10.2.182.148
22	10.2.182.149/32	10.2.182.149 – 10.2.182.149	10.2.182.149
23	10.2.182.150/32	10.2.182.150 – 10.2.182.150	10.2.182.150
24	10.2.182.151/32	10.2.182.151 – 10.2.182.151	10.2.182.151
25	10.2.182.152/32	10.2.182.152 – 10.2.182.152	10.2.182.152
26	10.2.182.153/32	10.2.182.153 – 10.2.182.153	10.2.182.153
27	10.2.182.154/32	10.2.182.154 – 10.2.182.154	10.2.182.154
28	10.2.182.155/32	10.2.182.155 – 10.2.182.155	10.2.182.155
29	10.2.182.156/32	10.2.182.156 – 10.2.182.156	10.2.182.156
30	10.2.182.157/32	10.2.182.157 – 10.2.182.157	10.2.182.157
31	10.2.182.158/32	10.2.182.158 – 10.2.182.158	10.2.182.158
32	10.2.182.159/32	10.2.182.159 – 10.2.182.159	10.2.182.159
33	10.2.182.160/32	10.2.182.160 – 10.2.182.160	10.2.182.160
34	10.2.182.161/32	10.2.182.161 – 10.2.182.161	10.2.182.161
35	10.2.182.162/32	10.2.182.162 – 10.2.182.162	10.2.182.162
36	10.2.182.163/32	10.2.182.163 – 10.2.182.163	10.2.182.163
37	10.2.182.164/32	10.2.182.164 – 10.2.182.164	10.2.182.164
38	10.2.182.165/32	10.2.182.165 – 10.2.182.165	10.2.182.165
39	10.2.182.166/32	10.2.182.166 – 10.2.182.166	10.2.182.166
40	10.2.182.167/32	10.2.182.167 – 10.2.182.167	10.2.182.167
41	10.2.182.168/32	10.2.182.168 – 10.2.182.168	10.2.182.168
42	10.2.182.169/32	10.2.182.169 – 10.2.182.169	10.2.182.169
43	10.2.182.170/32	10.2.182.170 – 10.2.182.170	10.2.182.170
44	10.2.182.171/32	10.2.182.171 – 10.2.182.171	10.2.182.171
45	10.2.182.172/32	10.2.182.172 – 10.2.182.172	10.2.182.172
46	10.2.182.173/32	10.2.182.173 – 10.2.182.173	10.2.182.173
47	10.2.182.174/32	10.2.182.174 – 10.2.182.174	10.2.182.174
48	10.2.182.175/32	10.2.182.175 – 10.2.182.175	10.2.182.175
49	10.2.182.176/32	10.2.182.176 – 10.2.182.176	10.2.182.176
50	10.2.182.177/32	10.2.182.177 – 10.2.182.177	10.2.182.177
51	10.2.182.178/32	10.2.182.178 – 10.2.182.178	10.2.182.178
52	10.2.182.179/32	10.2.182.179 – 10.2.182.179	10.2.182.179
53	10.2.182.180/32	10.2.182.180 – 10.2.182.180	10.2.182.180
54	10.2.182.181/32	10.2.182.181 – 10.2.182.181	10.2.182.181
55	10.2.182.182/32	10.2.182.182 – 10.2.182.182	10.2.182.182
56	10.2.182.183/32	10.2.182.183 – 10.2.182.183	10.2.182.183
57	10.2.182.184/32	10.2.182.184 – 10.2.182.184	10.2.182.184
58	10.2.182.185/32	10.2.182.185 – 10.2.182.185	10.2.182.185
59	10.2.182.186/32	10.2.182.186 – 10.2.182.186	10.2.182.186
60	10.2.182.187/32	10.2.182.187 – 10.2.182.187	10.2.182.187
61	10.2.182.188/32	10.2.182.188 – 10.2.182.188	10.2.182.188
62	10.2.182.189/32	10.2.182.189 – 10.2.182.189	10.2.182.189
63	10.2.182.190/32	10.2.182.190 – 10.2.182.190	10.2.182.190
64	10.2.182.191/32	10.2.182.191 – 10.2.182.191	10.2.182.191
65	10.2.182.192/32	10.2.182.192 – 10.2.182.192	10.2.182.192
66	10.2.182.193/32	10.2.182.193 – 10.2.182.193	10.2.182.193
67	10.2.182.194/32	10.2.182.194 – 10.2.182.194	10.2.182.194
68	10.2.182.195/32	10.2.182.195 – 10.2.182.195	10.2.182.195
69	10.2.182.196/32	10.2.182.196 – 10.2.182.196	10.2.182.196
70	10.2.182.197/32	10.2.182.197 – 10.2.182.197	10.2.182.197
71	10.2.182.198/32	10.2.182.198 – 10.2.182.198	10.2.182.198
72	10.2.182.199/32	10.2.182.199 – 10.2.182.199	10.2.182.199
73	10.2.182.200/32	10.2.182.200 – 10.2.182.200	10.2.182.200
74	10.2.182.201/32	10.2.182.201 – 10.2.182.201	10.2.182.201
75	10.2.182.202/32	10.2.182.202 – 10.2.182.202	10.2.182.202
76	10.2.182.203/32	10.2.182.203 – 10.2.182.203	10.2.182.203
77	10.2.182.204/32	10.2.182.204 – 10.2.182.204	10.2.182.204
78	10.2.182.205/32	10.2.182.205 – 10.2.182.205	10.2.182.205
79	10.2.182.206/32	10.2.182.206 – 10.2.182.206	10.2.182.206
80	10.2.182.207/32	10.2.182.207 – 10.2.182.207	10.2.182.207
81	10.2.182.208/32	10.2.182.208 – 10.2.182.208	10.2.182.208
82	10.2.182.209/32	10.2.182.209 – 10.2.182.209	10.2.182.209
83	10.2.182.210/32	10.2.182.210 – 10.2.182.210	10.2.182.210
84	10.2.182.211/32	10.2.182.211 – 10.2.182.211	10.2.182.211
85	10.2.182.212/32	10.2.182.212 – 10.2.182.212	10.2.182.212
86	10.2.182.213/32	10.2.182.213 – 10.2.182.213	10.2.182.213
87	10.2.182.214/32	10.2.182.214 – 10.2.182.214	10.2.182.214
88	10.2.182.215/32	10.2.182.215 – 10.2.182.215	10.2.182.215
89	10.2.182.216/32	10.2.182.216 – 10.2.182.216	10.2.182.216
90	10.2.182.217/32	10.2.182.217 – 10.2.182.217	10.2.182.217
91	10.2.182.218/32	10.2.182.218 – 10.2.182.218	10.2.182.218
92	10.2.182.219/32	10.2.182.219 – 10.2.182.219	10.2.182.219
93	10.2.182.220/32	10.2.182.220 – 10.2.182.220	10.2.182.220
94	10.2.182.221/32	10.2.182.221 – 10.2.182.221	10.2.182.221
95	10.2.182.222/32	10.2.182.222 – 10.2.182.222	10.2.182.222
96	10.2.182.223/32	10.2.182.223 – 10.2.182.223	10.2.182.223
97	10.2.182.224/32	10.2.182.224 – 10.2.182.224	10.2.182.224
98	10.2.182.225/32	10.2.182.225 – 10.2.182.225	10.2.182.225
99	10.2.182.226/32	10.2.182.226 – 10.2.182.226	10.2.182.226
100	10.2.182.227/32	10.2.182.227 – 10.2.182.227	10.2.182.227
101	10.2.182.228/32	10.2.182.228 – 10.2.182.228	10.2.182.228
102	10.2.182.229/32	10.2.182.229 – 10.2.182.229	10.2.182.229
103	10.2.182.230/32	10.2.182.230 – 10.2.182.230	10.2.182.230
104	10.2.182.231/32	10.2.182.231 – 10.2.182.231	10.2.182.231
105	10.2.182.232/32	10.2.182.232 – 10.2.182.232	10.2.182.232
106	10.2.182.233/32	10.2.182.233 – 10.2.182.233	10.2.182.233
107	10.2.182.234/32	10.2.182.234 – 10.2.182.234	10.2.182.234
108	10.2.182.235/32	10.2.182.235 – 10.2.182.235	10.2.182.235
109	10.2.182.236/32	10.2.182.236 – 10.2.182.236	10.2.182.236
110	10.2.182.237/32	10.2.182.237 – 10.2.182.237	10.2.182.237
111	10.2.182.238/32	10.2.182.238 – 10.2.182.238	10.2.182.238
112	10.2.182.239/32	10.2.182.239 – 10.2.182.239	10.2.182.239
113	10.2.182.240/32	10.2.182.240 – 10.2.182.240	10.2.182.240
114	10.2.182.241/32	10.2.182.241 – 10.2.182.241	10.2.182.241
115	10.2.182.242/32	10.2.182.242 – 10.2.182.242	10.2.182.242
116	10.2.182.243/32	10.2.182.243 – 10.2.182.243	10.2.182.243
117	10.2.182.244/32	10.2.182.244 – 10.2.182.244	10.2.182.244
118	10.2.182.245/32	10.2.182.245 – 10.2.182.245	10.2.182.245
119	10.2.182.246/32	10.2.182.246 – 10.2.182.246	10.2.182.246
120	10.2.182.247/32	10.2.182.247 – 10.2.182.247	10.2.182.247
121	10.2.182.248/32	10.2.182.248 – 10.2.182.248	10.2.182.248
122	10.2.182.249/32	10.2.182.249 – 10.2.182.249	10.2.182.249
123	10.2.182.250/32	10.2.182.250 – 10.2.182.250	10.2.182.250
124	10.2.182.251/32	10.2.182.251 – 10.2.182.251	10.2.182.251
125	10.2.182.252/32	10.2.182.252 – 10.2.182.252	10.2.182.252
126	10.2.182.253/32	10.2.182.253 – 10.2.182.253	10.2.182.253
127	10.2.182.254/32	10.2.182.254 – 10.2.182.254	10.2.182.254
128	10.2.182.255/32	10.2.182.255 – 10.2.182.255	10.2.182.255

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 →