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)10.3.231.128/25

network10.3.231.128/25

broadcast10.3.231.255

first host10.3.231.129

last host10.3.231.254

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.3.231.128/25

address00001010.00000011.11100111.10000000

subnet mask11111111.11111111.11111111.10000000

network00001010.00000011.11100111.10000000

broadcast00001010.00000011.11100111.11111111

green = network part, grey = host part

hex0x0a03e780

decimal168028032

reverse dns128.231.3.10.in-addr.arpa

ipv4-mapped::ffff:a03:e780

/25 split into /32 · 128 subnets

close ×

#	network	host range	broadcast
1	10.3.231.128/32	10.3.231.128 – 10.3.231.128	10.3.231.128
2	10.3.231.129/32	10.3.231.129 – 10.3.231.129	10.3.231.129
3	10.3.231.130/32	10.3.231.130 – 10.3.231.130	10.3.231.130
4	10.3.231.131/32	10.3.231.131 – 10.3.231.131	10.3.231.131
5	10.3.231.132/32	10.3.231.132 – 10.3.231.132	10.3.231.132
6	10.3.231.133/32	10.3.231.133 – 10.3.231.133	10.3.231.133
7	10.3.231.134/32	10.3.231.134 – 10.3.231.134	10.3.231.134
8	10.3.231.135/32	10.3.231.135 – 10.3.231.135	10.3.231.135
9	10.3.231.136/32	10.3.231.136 – 10.3.231.136	10.3.231.136
10	10.3.231.137/32	10.3.231.137 – 10.3.231.137	10.3.231.137
11	10.3.231.138/32	10.3.231.138 – 10.3.231.138	10.3.231.138
12	10.3.231.139/32	10.3.231.139 – 10.3.231.139	10.3.231.139
13	10.3.231.140/32	10.3.231.140 – 10.3.231.140	10.3.231.140
14	10.3.231.141/32	10.3.231.141 – 10.3.231.141	10.3.231.141
15	10.3.231.142/32	10.3.231.142 – 10.3.231.142	10.3.231.142
16	10.3.231.143/32	10.3.231.143 – 10.3.231.143	10.3.231.143
17	10.3.231.144/32	10.3.231.144 – 10.3.231.144	10.3.231.144
18	10.3.231.145/32	10.3.231.145 – 10.3.231.145	10.3.231.145
19	10.3.231.146/32	10.3.231.146 – 10.3.231.146	10.3.231.146
20	10.3.231.147/32	10.3.231.147 – 10.3.231.147	10.3.231.147
21	10.3.231.148/32	10.3.231.148 – 10.3.231.148	10.3.231.148
22	10.3.231.149/32	10.3.231.149 – 10.3.231.149	10.3.231.149
23	10.3.231.150/32	10.3.231.150 – 10.3.231.150	10.3.231.150
24	10.3.231.151/32	10.3.231.151 – 10.3.231.151	10.3.231.151
25	10.3.231.152/32	10.3.231.152 – 10.3.231.152	10.3.231.152
26	10.3.231.153/32	10.3.231.153 – 10.3.231.153	10.3.231.153
27	10.3.231.154/32	10.3.231.154 – 10.3.231.154	10.3.231.154
28	10.3.231.155/32	10.3.231.155 – 10.3.231.155	10.3.231.155
29	10.3.231.156/32	10.3.231.156 – 10.3.231.156	10.3.231.156
30	10.3.231.157/32	10.3.231.157 – 10.3.231.157	10.3.231.157
31	10.3.231.158/32	10.3.231.158 – 10.3.231.158	10.3.231.158
32	10.3.231.159/32	10.3.231.159 – 10.3.231.159	10.3.231.159
33	10.3.231.160/32	10.3.231.160 – 10.3.231.160	10.3.231.160
34	10.3.231.161/32	10.3.231.161 – 10.3.231.161	10.3.231.161
35	10.3.231.162/32	10.3.231.162 – 10.3.231.162	10.3.231.162
36	10.3.231.163/32	10.3.231.163 – 10.3.231.163	10.3.231.163
37	10.3.231.164/32	10.3.231.164 – 10.3.231.164	10.3.231.164
38	10.3.231.165/32	10.3.231.165 – 10.3.231.165	10.3.231.165
39	10.3.231.166/32	10.3.231.166 – 10.3.231.166	10.3.231.166
40	10.3.231.167/32	10.3.231.167 – 10.3.231.167	10.3.231.167
41	10.3.231.168/32	10.3.231.168 – 10.3.231.168	10.3.231.168
42	10.3.231.169/32	10.3.231.169 – 10.3.231.169	10.3.231.169
43	10.3.231.170/32	10.3.231.170 – 10.3.231.170	10.3.231.170
44	10.3.231.171/32	10.3.231.171 – 10.3.231.171	10.3.231.171
45	10.3.231.172/32	10.3.231.172 – 10.3.231.172	10.3.231.172
46	10.3.231.173/32	10.3.231.173 – 10.3.231.173	10.3.231.173
47	10.3.231.174/32	10.3.231.174 – 10.3.231.174	10.3.231.174
48	10.3.231.175/32	10.3.231.175 – 10.3.231.175	10.3.231.175
49	10.3.231.176/32	10.3.231.176 – 10.3.231.176	10.3.231.176
50	10.3.231.177/32	10.3.231.177 – 10.3.231.177	10.3.231.177
51	10.3.231.178/32	10.3.231.178 – 10.3.231.178	10.3.231.178
52	10.3.231.179/32	10.3.231.179 – 10.3.231.179	10.3.231.179
53	10.3.231.180/32	10.3.231.180 – 10.3.231.180	10.3.231.180
54	10.3.231.181/32	10.3.231.181 – 10.3.231.181	10.3.231.181
55	10.3.231.182/32	10.3.231.182 – 10.3.231.182	10.3.231.182
56	10.3.231.183/32	10.3.231.183 – 10.3.231.183	10.3.231.183
57	10.3.231.184/32	10.3.231.184 – 10.3.231.184	10.3.231.184
58	10.3.231.185/32	10.3.231.185 – 10.3.231.185	10.3.231.185
59	10.3.231.186/32	10.3.231.186 – 10.3.231.186	10.3.231.186
60	10.3.231.187/32	10.3.231.187 – 10.3.231.187	10.3.231.187
61	10.3.231.188/32	10.3.231.188 – 10.3.231.188	10.3.231.188
62	10.3.231.189/32	10.3.231.189 – 10.3.231.189	10.3.231.189
63	10.3.231.190/32	10.3.231.190 – 10.3.231.190	10.3.231.190
64	10.3.231.191/32	10.3.231.191 – 10.3.231.191	10.3.231.191
65	10.3.231.192/32	10.3.231.192 – 10.3.231.192	10.3.231.192
66	10.3.231.193/32	10.3.231.193 – 10.3.231.193	10.3.231.193
67	10.3.231.194/32	10.3.231.194 – 10.3.231.194	10.3.231.194
68	10.3.231.195/32	10.3.231.195 – 10.3.231.195	10.3.231.195
69	10.3.231.196/32	10.3.231.196 – 10.3.231.196	10.3.231.196
70	10.3.231.197/32	10.3.231.197 – 10.3.231.197	10.3.231.197
71	10.3.231.198/32	10.3.231.198 – 10.3.231.198	10.3.231.198
72	10.3.231.199/32	10.3.231.199 – 10.3.231.199	10.3.231.199
73	10.3.231.200/32	10.3.231.200 – 10.3.231.200	10.3.231.200
74	10.3.231.201/32	10.3.231.201 – 10.3.231.201	10.3.231.201
75	10.3.231.202/32	10.3.231.202 – 10.3.231.202	10.3.231.202
76	10.3.231.203/32	10.3.231.203 – 10.3.231.203	10.3.231.203
77	10.3.231.204/32	10.3.231.204 – 10.3.231.204	10.3.231.204
78	10.3.231.205/32	10.3.231.205 – 10.3.231.205	10.3.231.205
79	10.3.231.206/32	10.3.231.206 – 10.3.231.206	10.3.231.206
80	10.3.231.207/32	10.3.231.207 – 10.3.231.207	10.3.231.207
81	10.3.231.208/32	10.3.231.208 – 10.3.231.208	10.3.231.208
82	10.3.231.209/32	10.3.231.209 – 10.3.231.209	10.3.231.209
83	10.3.231.210/32	10.3.231.210 – 10.3.231.210	10.3.231.210
84	10.3.231.211/32	10.3.231.211 – 10.3.231.211	10.3.231.211
85	10.3.231.212/32	10.3.231.212 – 10.3.231.212	10.3.231.212
86	10.3.231.213/32	10.3.231.213 – 10.3.231.213	10.3.231.213
87	10.3.231.214/32	10.3.231.214 – 10.3.231.214	10.3.231.214
88	10.3.231.215/32	10.3.231.215 – 10.3.231.215	10.3.231.215
89	10.3.231.216/32	10.3.231.216 – 10.3.231.216	10.3.231.216
90	10.3.231.217/32	10.3.231.217 – 10.3.231.217	10.3.231.217
91	10.3.231.218/32	10.3.231.218 – 10.3.231.218	10.3.231.218
92	10.3.231.219/32	10.3.231.219 – 10.3.231.219	10.3.231.219
93	10.3.231.220/32	10.3.231.220 – 10.3.231.220	10.3.231.220
94	10.3.231.221/32	10.3.231.221 – 10.3.231.221	10.3.231.221
95	10.3.231.222/32	10.3.231.222 – 10.3.231.222	10.3.231.222
96	10.3.231.223/32	10.3.231.223 – 10.3.231.223	10.3.231.223
97	10.3.231.224/32	10.3.231.224 – 10.3.231.224	10.3.231.224
98	10.3.231.225/32	10.3.231.225 – 10.3.231.225	10.3.231.225
99	10.3.231.226/32	10.3.231.226 – 10.3.231.226	10.3.231.226
100	10.3.231.227/32	10.3.231.227 – 10.3.231.227	10.3.231.227
101	10.3.231.228/32	10.3.231.228 – 10.3.231.228	10.3.231.228
102	10.3.231.229/32	10.3.231.229 – 10.3.231.229	10.3.231.229
103	10.3.231.230/32	10.3.231.230 – 10.3.231.230	10.3.231.230
104	10.3.231.231/32	10.3.231.231 – 10.3.231.231	10.3.231.231
105	10.3.231.232/32	10.3.231.232 – 10.3.231.232	10.3.231.232
106	10.3.231.233/32	10.3.231.233 – 10.3.231.233	10.3.231.233
107	10.3.231.234/32	10.3.231.234 – 10.3.231.234	10.3.231.234
108	10.3.231.235/32	10.3.231.235 – 10.3.231.235	10.3.231.235
109	10.3.231.236/32	10.3.231.236 – 10.3.231.236	10.3.231.236
110	10.3.231.237/32	10.3.231.237 – 10.3.231.237	10.3.231.237
111	10.3.231.238/32	10.3.231.238 – 10.3.231.238	10.3.231.238
112	10.3.231.239/32	10.3.231.239 – 10.3.231.239	10.3.231.239
113	10.3.231.240/32	10.3.231.240 – 10.3.231.240	10.3.231.240
114	10.3.231.241/32	10.3.231.241 – 10.3.231.241	10.3.231.241
115	10.3.231.242/32	10.3.231.242 – 10.3.231.242	10.3.231.242
116	10.3.231.243/32	10.3.231.243 – 10.3.231.243	10.3.231.243
117	10.3.231.244/32	10.3.231.244 – 10.3.231.244	10.3.231.244
118	10.3.231.245/32	10.3.231.245 – 10.3.231.245	10.3.231.245
119	10.3.231.246/32	10.3.231.246 – 10.3.231.246	10.3.231.246
120	10.3.231.247/32	10.3.231.247 – 10.3.231.247	10.3.231.247
121	10.3.231.248/32	10.3.231.248 – 10.3.231.248	10.3.231.248
122	10.3.231.249/32	10.3.231.249 – 10.3.231.249	10.3.231.249
123	10.3.231.250/32	10.3.231.250 – 10.3.231.250	10.3.231.250
124	10.3.231.251/32	10.3.231.251 – 10.3.231.251	10.3.231.251
125	10.3.231.252/32	10.3.231.252 – 10.3.231.252	10.3.231.252
126	10.3.231.253/32	10.3.231.253 – 10.3.231.253	10.3.231.253
127	10.3.231.254/32	10.3.231.254 – 10.3.231.254	10.3.231.254
128	10.3.231.255/32	10.3.231.255 – 10.3.231.255	10.3.231.255

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 →