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)10.2.201.128/25

network10.2.201.128/25

broadcast10.2.201.255

first host10.2.201.129

last host10.2.201.254

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.2.201.128/25

address00001010.00000010.11001001.10000000

subnet mask11111111.11111111.11111111.10000000

network00001010.00000010.11001001.10000000

broadcast00001010.00000010.11001001.11111111

green = network part, grey = host part

hex0x0a02c980

decimal167954816

reverse dns128.201.2.10.in-addr.arpa

ipv4-mapped::ffff:a02:c980

/25 split into /32 · 128 subnets

close ×

#	network	host range	broadcast
1	10.2.201.128/32	10.2.201.128 – 10.2.201.128	10.2.201.128
2	10.2.201.129/32	10.2.201.129 – 10.2.201.129	10.2.201.129
3	10.2.201.130/32	10.2.201.130 – 10.2.201.130	10.2.201.130
4	10.2.201.131/32	10.2.201.131 – 10.2.201.131	10.2.201.131
5	10.2.201.132/32	10.2.201.132 – 10.2.201.132	10.2.201.132
6	10.2.201.133/32	10.2.201.133 – 10.2.201.133	10.2.201.133
7	10.2.201.134/32	10.2.201.134 – 10.2.201.134	10.2.201.134
8	10.2.201.135/32	10.2.201.135 – 10.2.201.135	10.2.201.135
9	10.2.201.136/32	10.2.201.136 – 10.2.201.136	10.2.201.136
10	10.2.201.137/32	10.2.201.137 – 10.2.201.137	10.2.201.137
11	10.2.201.138/32	10.2.201.138 – 10.2.201.138	10.2.201.138
12	10.2.201.139/32	10.2.201.139 – 10.2.201.139	10.2.201.139
13	10.2.201.140/32	10.2.201.140 – 10.2.201.140	10.2.201.140
14	10.2.201.141/32	10.2.201.141 – 10.2.201.141	10.2.201.141
15	10.2.201.142/32	10.2.201.142 – 10.2.201.142	10.2.201.142
16	10.2.201.143/32	10.2.201.143 – 10.2.201.143	10.2.201.143
17	10.2.201.144/32	10.2.201.144 – 10.2.201.144	10.2.201.144
18	10.2.201.145/32	10.2.201.145 – 10.2.201.145	10.2.201.145
19	10.2.201.146/32	10.2.201.146 – 10.2.201.146	10.2.201.146
20	10.2.201.147/32	10.2.201.147 – 10.2.201.147	10.2.201.147
21	10.2.201.148/32	10.2.201.148 – 10.2.201.148	10.2.201.148
22	10.2.201.149/32	10.2.201.149 – 10.2.201.149	10.2.201.149
23	10.2.201.150/32	10.2.201.150 – 10.2.201.150	10.2.201.150
24	10.2.201.151/32	10.2.201.151 – 10.2.201.151	10.2.201.151
25	10.2.201.152/32	10.2.201.152 – 10.2.201.152	10.2.201.152
26	10.2.201.153/32	10.2.201.153 – 10.2.201.153	10.2.201.153
27	10.2.201.154/32	10.2.201.154 – 10.2.201.154	10.2.201.154
28	10.2.201.155/32	10.2.201.155 – 10.2.201.155	10.2.201.155
29	10.2.201.156/32	10.2.201.156 – 10.2.201.156	10.2.201.156
30	10.2.201.157/32	10.2.201.157 – 10.2.201.157	10.2.201.157
31	10.2.201.158/32	10.2.201.158 – 10.2.201.158	10.2.201.158
32	10.2.201.159/32	10.2.201.159 – 10.2.201.159	10.2.201.159
33	10.2.201.160/32	10.2.201.160 – 10.2.201.160	10.2.201.160
34	10.2.201.161/32	10.2.201.161 – 10.2.201.161	10.2.201.161
35	10.2.201.162/32	10.2.201.162 – 10.2.201.162	10.2.201.162
36	10.2.201.163/32	10.2.201.163 – 10.2.201.163	10.2.201.163
37	10.2.201.164/32	10.2.201.164 – 10.2.201.164	10.2.201.164
38	10.2.201.165/32	10.2.201.165 – 10.2.201.165	10.2.201.165
39	10.2.201.166/32	10.2.201.166 – 10.2.201.166	10.2.201.166
40	10.2.201.167/32	10.2.201.167 – 10.2.201.167	10.2.201.167
41	10.2.201.168/32	10.2.201.168 – 10.2.201.168	10.2.201.168
42	10.2.201.169/32	10.2.201.169 – 10.2.201.169	10.2.201.169
43	10.2.201.170/32	10.2.201.170 – 10.2.201.170	10.2.201.170
44	10.2.201.171/32	10.2.201.171 – 10.2.201.171	10.2.201.171
45	10.2.201.172/32	10.2.201.172 – 10.2.201.172	10.2.201.172
46	10.2.201.173/32	10.2.201.173 – 10.2.201.173	10.2.201.173
47	10.2.201.174/32	10.2.201.174 – 10.2.201.174	10.2.201.174
48	10.2.201.175/32	10.2.201.175 – 10.2.201.175	10.2.201.175
49	10.2.201.176/32	10.2.201.176 – 10.2.201.176	10.2.201.176
50	10.2.201.177/32	10.2.201.177 – 10.2.201.177	10.2.201.177
51	10.2.201.178/32	10.2.201.178 – 10.2.201.178	10.2.201.178
52	10.2.201.179/32	10.2.201.179 – 10.2.201.179	10.2.201.179
53	10.2.201.180/32	10.2.201.180 – 10.2.201.180	10.2.201.180
54	10.2.201.181/32	10.2.201.181 – 10.2.201.181	10.2.201.181
55	10.2.201.182/32	10.2.201.182 – 10.2.201.182	10.2.201.182
56	10.2.201.183/32	10.2.201.183 – 10.2.201.183	10.2.201.183
57	10.2.201.184/32	10.2.201.184 – 10.2.201.184	10.2.201.184
58	10.2.201.185/32	10.2.201.185 – 10.2.201.185	10.2.201.185
59	10.2.201.186/32	10.2.201.186 – 10.2.201.186	10.2.201.186
60	10.2.201.187/32	10.2.201.187 – 10.2.201.187	10.2.201.187
61	10.2.201.188/32	10.2.201.188 – 10.2.201.188	10.2.201.188
62	10.2.201.189/32	10.2.201.189 – 10.2.201.189	10.2.201.189
63	10.2.201.190/32	10.2.201.190 – 10.2.201.190	10.2.201.190
64	10.2.201.191/32	10.2.201.191 – 10.2.201.191	10.2.201.191
65	10.2.201.192/32	10.2.201.192 – 10.2.201.192	10.2.201.192
66	10.2.201.193/32	10.2.201.193 – 10.2.201.193	10.2.201.193
67	10.2.201.194/32	10.2.201.194 – 10.2.201.194	10.2.201.194
68	10.2.201.195/32	10.2.201.195 – 10.2.201.195	10.2.201.195
69	10.2.201.196/32	10.2.201.196 – 10.2.201.196	10.2.201.196
70	10.2.201.197/32	10.2.201.197 – 10.2.201.197	10.2.201.197
71	10.2.201.198/32	10.2.201.198 – 10.2.201.198	10.2.201.198
72	10.2.201.199/32	10.2.201.199 – 10.2.201.199	10.2.201.199
73	10.2.201.200/32	10.2.201.200 – 10.2.201.200	10.2.201.200
74	10.2.201.201/32	10.2.201.201 – 10.2.201.201	10.2.201.201
75	10.2.201.202/32	10.2.201.202 – 10.2.201.202	10.2.201.202
76	10.2.201.203/32	10.2.201.203 – 10.2.201.203	10.2.201.203
77	10.2.201.204/32	10.2.201.204 – 10.2.201.204	10.2.201.204
78	10.2.201.205/32	10.2.201.205 – 10.2.201.205	10.2.201.205
79	10.2.201.206/32	10.2.201.206 – 10.2.201.206	10.2.201.206
80	10.2.201.207/32	10.2.201.207 – 10.2.201.207	10.2.201.207
81	10.2.201.208/32	10.2.201.208 – 10.2.201.208	10.2.201.208
82	10.2.201.209/32	10.2.201.209 – 10.2.201.209	10.2.201.209
83	10.2.201.210/32	10.2.201.210 – 10.2.201.210	10.2.201.210
84	10.2.201.211/32	10.2.201.211 – 10.2.201.211	10.2.201.211
85	10.2.201.212/32	10.2.201.212 – 10.2.201.212	10.2.201.212
86	10.2.201.213/32	10.2.201.213 – 10.2.201.213	10.2.201.213
87	10.2.201.214/32	10.2.201.214 – 10.2.201.214	10.2.201.214
88	10.2.201.215/32	10.2.201.215 – 10.2.201.215	10.2.201.215
89	10.2.201.216/32	10.2.201.216 – 10.2.201.216	10.2.201.216
90	10.2.201.217/32	10.2.201.217 – 10.2.201.217	10.2.201.217
91	10.2.201.218/32	10.2.201.218 – 10.2.201.218	10.2.201.218
92	10.2.201.219/32	10.2.201.219 – 10.2.201.219	10.2.201.219
93	10.2.201.220/32	10.2.201.220 – 10.2.201.220	10.2.201.220
94	10.2.201.221/32	10.2.201.221 – 10.2.201.221	10.2.201.221
95	10.2.201.222/32	10.2.201.222 – 10.2.201.222	10.2.201.222
96	10.2.201.223/32	10.2.201.223 – 10.2.201.223	10.2.201.223
97	10.2.201.224/32	10.2.201.224 – 10.2.201.224	10.2.201.224
98	10.2.201.225/32	10.2.201.225 – 10.2.201.225	10.2.201.225
99	10.2.201.226/32	10.2.201.226 – 10.2.201.226	10.2.201.226
100	10.2.201.227/32	10.2.201.227 – 10.2.201.227	10.2.201.227
101	10.2.201.228/32	10.2.201.228 – 10.2.201.228	10.2.201.228
102	10.2.201.229/32	10.2.201.229 – 10.2.201.229	10.2.201.229
103	10.2.201.230/32	10.2.201.230 – 10.2.201.230	10.2.201.230
104	10.2.201.231/32	10.2.201.231 – 10.2.201.231	10.2.201.231
105	10.2.201.232/32	10.2.201.232 – 10.2.201.232	10.2.201.232
106	10.2.201.233/32	10.2.201.233 – 10.2.201.233	10.2.201.233
107	10.2.201.234/32	10.2.201.234 – 10.2.201.234	10.2.201.234
108	10.2.201.235/32	10.2.201.235 – 10.2.201.235	10.2.201.235
109	10.2.201.236/32	10.2.201.236 – 10.2.201.236	10.2.201.236
110	10.2.201.237/32	10.2.201.237 – 10.2.201.237	10.2.201.237
111	10.2.201.238/32	10.2.201.238 – 10.2.201.238	10.2.201.238
112	10.2.201.239/32	10.2.201.239 – 10.2.201.239	10.2.201.239
113	10.2.201.240/32	10.2.201.240 – 10.2.201.240	10.2.201.240
114	10.2.201.241/32	10.2.201.241 – 10.2.201.241	10.2.201.241
115	10.2.201.242/32	10.2.201.242 – 10.2.201.242	10.2.201.242
116	10.2.201.243/32	10.2.201.243 – 10.2.201.243	10.2.201.243
117	10.2.201.244/32	10.2.201.244 – 10.2.201.244	10.2.201.244
118	10.2.201.245/32	10.2.201.245 – 10.2.201.245	10.2.201.245
119	10.2.201.246/32	10.2.201.246 – 10.2.201.246	10.2.201.246
120	10.2.201.247/32	10.2.201.247 – 10.2.201.247	10.2.201.247
121	10.2.201.248/32	10.2.201.248 – 10.2.201.248	10.2.201.248
122	10.2.201.249/32	10.2.201.249 – 10.2.201.249	10.2.201.249
123	10.2.201.250/32	10.2.201.250 – 10.2.201.250	10.2.201.250
124	10.2.201.251/32	10.2.201.251 – 10.2.201.251	10.2.201.251
125	10.2.201.252/32	10.2.201.252 – 10.2.201.252	10.2.201.252
126	10.2.201.253/32	10.2.201.253 – 10.2.201.253	10.2.201.253
127	10.2.201.254/32	10.2.201.254 – 10.2.201.254	10.2.201.254
128	10.2.201.255/32	10.2.201.255 – 10.2.201.255	10.2.201.255

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 →