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)10.2.211.128/25

network10.2.211.128/25

broadcast10.2.211.255

first host10.2.211.129

last host10.2.211.254

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.2.211.128/25

address00001010.00000010.11010011.10000000

subnet mask11111111.11111111.11111111.10000000

network00001010.00000010.11010011.10000000

broadcast00001010.00000010.11010011.11111111

green = network part, grey = host part

hex0x0a02d380

decimal167957376

reverse dns128.211.2.10.in-addr.arpa

ipv4-mapped::ffff:a02:d380

/25 split into /32 · 128 subnets

close ×

#	network	host range	broadcast
1	10.2.211.128/32	10.2.211.128 – 10.2.211.128	10.2.211.128
2	10.2.211.129/32	10.2.211.129 – 10.2.211.129	10.2.211.129
3	10.2.211.130/32	10.2.211.130 – 10.2.211.130	10.2.211.130
4	10.2.211.131/32	10.2.211.131 – 10.2.211.131	10.2.211.131
5	10.2.211.132/32	10.2.211.132 – 10.2.211.132	10.2.211.132
6	10.2.211.133/32	10.2.211.133 – 10.2.211.133	10.2.211.133
7	10.2.211.134/32	10.2.211.134 – 10.2.211.134	10.2.211.134
8	10.2.211.135/32	10.2.211.135 – 10.2.211.135	10.2.211.135
9	10.2.211.136/32	10.2.211.136 – 10.2.211.136	10.2.211.136
10	10.2.211.137/32	10.2.211.137 – 10.2.211.137	10.2.211.137
11	10.2.211.138/32	10.2.211.138 – 10.2.211.138	10.2.211.138
12	10.2.211.139/32	10.2.211.139 – 10.2.211.139	10.2.211.139
13	10.2.211.140/32	10.2.211.140 – 10.2.211.140	10.2.211.140
14	10.2.211.141/32	10.2.211.141 – 10.2.211.141	10.2.211.141
15	10.2.211.142/32	10.2.211.142 – 10.2.211.142	10.2.211.142
16	10.2.211.143/32	10.2.211.143 – 10.2.211.143	10.2.211.143
17	10.2.211.144/32	10.2.211.144 – 10.2.211.144	10.2.211.144
18	10.2.211.145/32	10.2.211.145 – 10.2.211.145	10.2.211.145
19	10.2.211.146/32	10.2.211.146 – 10.2.211.146	10.2.211.146
20	10.2.211.147/32	10.2.211.147 – 10.2.211.147	10.2.211.147
21	10.2.211.148/32	10.2.211.148 – 10.2.211.148	10.2.211.148
22	10.2.211.149/32	10.2.211.149 – 10.2.211.149	10.2.211.149
23	10.2.211.150/32	10.2.211.150 – 10.2.211.150	10.2.211.150
24	10.2.211.151/32	10.2.211.151 – 10.2.211.151	10.2.211.151
25	10.2.211.152/32	10.2.211.152 – 10.2.211.152	10.2.211.152
26	10.2.211.153/32	10.2.211.153 – 10.2.211.153	10.2.211.153
27	10.2.211.154/32	10.2.211.154 – 10.2.211.154	10.2.211.154
28	10.2.211.155/32	10.2.211.155 – 10.2.211.155	10.2.211.155
29	10.2.211.156/32	10.2.211.156 – 10.2.211.156	10.2.211.156
30	10.2.211.157/32	10.2.211.157 – 10.2.211.157	10.2.211.157
31	10.2.211.158/32	10.2.211.158 – 10.2.211.158	10.2.211.158
32	10.2.211.159/32	10.2.211.159 – 10.2.211.159	10.2.211.159
33	10.2.211.160/32	10.2.211.160 – 10.2.211.160	10.2.211.160
34	10.2.211.161/32	10.2.211.161 – 10.2.211.161	10.2.211.161
35	10.2.211.162/32	10.2.211.162 – 10.2.211.162	10.2.211.162
36	10.2.211.163/32	10.2.211.163 – 10.2.211.163	10.2.211.163
37	10.2.211.164/32	10.2.211.164 – 10.2.211.164	10.2.211.164
38	10.2.211.165/32	10.2.211.165 – 10.2.211.165	10.2.211.165
39	10.2.211.166/32	10.2.211.166 – 10.2.211.166	10.2.211.166
40	10.2.211.167/32	10.2.211.167 – 10.2.211.167	10.2.211.167
41	10.2.211.168/32	10.2.211.168 – 10.2.211.168	10.2.211.168
42	10.2.211.169/32	10.2.211.169 – 10.2.211.169	10.2.211.169
43	10.2.211.170/32	10.2.211.170 – 10.2.211.170	10.2.211.170
44	10.2.211.171/32	10.2.211.171 – 10.2.211.171	10.2.211.171
45	10.2.211.172/32	10.2.211.172 – 10.2.211.172	10.2.211.172
46	10.2.211.173/32	10.2.211.173 – 10.2.211.173	10.2.211.173
47	10.2.211.174/32	10.2.211.174 – 10.2.211.174	10.2.211.174
48	10.2.211.175/32	10.2.211.175 – 10.2.211.175	10.2.211.175
49	10.2.211.176/32	10.2.211.176 – 10.2.211.176	10.2.211.176
50	10.2.211.177/32	10.2.211.177 – 10.2.211.177	10.2.211.177
51	10.2.211.178/32	10.2.211.178 – 10.2.211.178	10.2.211.178
52	10.2.211.179/32	10.2.211.179 – 10.2.211.179	10.2.211.179
53	10.2.211.180/32	10.2.211.180 – 10.2.211.180	10.2.211.180
54	10.2.211.181/32	10.2.211.181 – 10.2.211.181	10.2.211.181
55	10.2.211.182/32	10.2.211.182 – 10.2.211.182	10.2.211.182
56	10.2.211.183/32	10.2.211.183 – 10.2.211.183	10.2.211.183
57	10.2.211.184/32	10.2.211.184 – 10.2.211.184	10.2.211.184
58	10.2.211.185/32	10.2.211.185 – 10.2.211.185	10.2.211.185
59	10.2.211.186/32	10.2.211.186 – 10.2.211.186	10.2.211.186
60	10.2.211.187/32	10.2.211.187 – 10.2.211.187	10.2.211.187
61	10.2.211.188/32	10.2.211.188 – 10.2.211.188	10.2.211.188
62	10.2.211.189/32	10.2.211.189 – 10.2.211.189	10.2.211.189
63	10.2.211.190/32	10.2.211.190 – 10.2.211.190	10.2.211.190
64	10.2.211.191/32	10.2.211.191 – 10.2.211.191	10.2.211.191
65	10.2.211.192/32	10.2.211.192 – 10.2.211.192	10.2.211.192
66	10.2.211.193/32	10.2.211.193 – 10.2.211.193	10.2.211.193
67	10.2.211.194/32	10.2.211.194 – 10.2.211.194	10.2.211.194
68	10.2.211.195/32	10.2.211.195 – 10.2.211.195	10.2.211.195
69	10.2.211.196/32	10.2.211.196 – 10.2.211.196	10.2.211.196
70	10.2.211.197/32	10.2.211.197 – 10.2.211.197	10.2.211.197
71	10.2.211.198/32	10.2.211.198 – 10.2.211.198	10.2.211.198
72	10.2.211.199/32	10.2.211.199 – 10.2.211.199	10.2.211.199
73	10.2.211.200/32	10.2.211.200 – 10.2.211.200	10.2.211.200
74	10.2.211.201/32	10.2.211.201 – 10.2.211.201	10.2.211.201
75	10.2.211.202/32	10.2.211.202 – 10.2.211.202	10.2.211.202
76	10.2.211.203/32	10.2.211.203 – 10.2.211.203	10.2.211.203
77	10.2.211.204/32	10.2.211.204 – 10.2.211.204	10.2.211.204
78	10.2.211.205/32	10.2.211.205 – 10.2.211.205	10.2.211.205
79	10.2.211.206/32	10.2.211.206 – 10.2.211.206	10.2.211.206
80	10.2.211.207/32	10.2.211.207 – 10.2.211.207	10.2.211.207
81	10.2.211.208/32	10.2.211.208 – 10.2.211.208	10.2.211.208
82	10.2.211.209/32	10.2.211.209 – 10.2.211.209	10.2.211.209
83	10.2.211.210/32	10.2.211.210 – 10.2.211.210	10.2.211.210
84	10.2.211.211/32	10.2.211.211 – 10.2.211.211	10.2.211.211
85	10.2.211.212/32	10.2.211.212 – 10.2.211.212	10.2.211.212
86	10.2.211.213/32	10.2.211.213 – 10.2.211.213	10.2.211.213
87	10.2.211.214/32	10.2.211.214 – 10.2.211.214	10.2.211.214
88	10.2.211.215/32	10.2.211.215 – 10.2.211.215	10.2.211.215
89	10.2.211.216/32	10.2.211.216 – 10.2.211.216	10.2.211.216
90	10.2.211.217/32	10.2.211.217 – 10.2.211.217	10.2.211.217
91	10.2.211.218/32	10.2.211.218 – 10.2.211.218	10.2.211.218
92	10.2.211.219/32	10.2.211.219 – 10.2.211.219	10.2.211.219
93	10.2.211.220/32	10.2.211.220 – 10.2.211.220	10.2.211.220
94	10.2.211.221/32	10.2.211.221 – 10.2.211.221	10.2.211.221
95	10.2.211.222/32	10.2.211.222 – 10.2.211.222	10.2.211.222
96	10.2.211.223/32	10.2.211.223 – 10.2.211.223	10.2.211.223
97	10.2.211.224/32	10.2.211.224 – 10.2.211.224	10.2.211.224
98	10.2.211.225/32	10.2.211.225 – 10.2.211.225	10.2.211.225
99	10.2.211.226/32	10.2.211.226 – 10.2.211.226	10.2.211.226
100	10.2.211.227/32	10.2.211.227 – 10.2.211.227	10.2.211.227
101	10.2.211.228/32	10.2.211.228 – 10.2.211.228	10.2.211.228
102	10.2.211.229/32	10.2.211.229 – 10.2.211.229	10.2.211.229
103	10.2.211.230/32	10.2.211.230 – 10.2.211.230	10.2.211.230
104	10.2.211.231/32	10.2.211.231 – 10.2.211.231	10.2.211.231
105	10.2.211.232/32	10.2.211.232 – 10.2.211.232	10.2.211.232
106	10.2.211.233/32	10.2.211.233 – 10.2.211.233	10.2.211.233
107	10.2.211.234/32	10.2.211.234 – 10.2.211.234	10.2.211.234
108	10.2.211.235/32	10.2.211.235 – 10.2.211.235	10.2.211.235
109	10.2.211.236/32	10.2.211.236 – 10.2.211.236	10.2.211.236
110	10.2.211.237/32	10.2.211.237 – 10.2.211.237	10.2.211.237
111	10.2.211.238/32	10.2.211.238 – 10.2.211.238	10.2.211.238
112	10.2.211.239/32	10.2.211.239 – 10.2.211.239	10.2.211.239
113	10.2.211.240/32	10.2.211.240 – 10.2.211.240	10.2.211.240
114	10.2.211.241/32	10.2.211.241 – 10.2.211.241	10.2.211.241
115	10.2.211.242/32	10.2.211.242 – 10.2.211.242	10.2.211.242
116	10.2.211.243/32	10.2.211.243 – 10.2.211.243	10.2.211.243
117	10.2.211.244/32	10.2.211.244 – 10.2.211.244	10.2.211.244
118	10.2.211.245/32	10.2.211.245 – 10.2.211.245	10.2.211.245
119	10.2.211.246/32	10.2.211.246 – 10.2.211.246	10.2.211.246
120	10.2.211.247/32	10.2.211.247 – 10.2.211.247	10.2.211.247
121	10.2.211.248/32	10.2.211.248 – 10.2.211.248	10.2.211.248
122	10.2.211.249/32	10.2.211.249 – 10.2.211.249	10.2.211.249
123	10.2.211.250/32	10.2.211.250 – 10.2.211.250	10.2.211.250
124	10.2.211.251/32	10.2.211.251 – 10.2.211.251	10.2.211.251
125	10.2.211.252/32	10.2.211.252 – 10.2.211.252	10.2.211.252
126	10.2.211.253/32	10.2.211.253 – 10.2.211.253	10.2.211.253
127	10.2.211.254/32	10.2.211.254 – 10.2.211.254	10.2.211.254
128	10.2.211.255/32	10.2.211.255 – 10.2.211.255	10.2.211.255

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 →