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)10.2.112.128/25

network10.2.112.128/25

broadcast10.2.112.255

first host10.2.112.129

last host10.2.112.254

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.2.112.128/25

address00001010.00000010.01110000.10000000

subnet mask11111111.11111111.11111111.10000000

network00001010.00000010.01110000.10000000

broadcast00001010.00000010.01110000.11111111

green = network part, grey = host part

hex0x0a027080

decimal167932032

reverse dns128.112.2.10.in-addr.arpa

ipv4-mapped::ffff:a02:7080

/25 split into /32 · 128 subnets

close ×

#	network	host range	broadcast
1	10.2.112.128/32	10.2.112.128 – 10.2.112.128	10.2.112.128
2	10.2.112.129/32	10.2.112.129 – 10.2.112.129	10.2.112.129
3	10.2.112.130/32	10.2.112.130 – 10.2.112.130	10.2.112.130
4	10.2.112.131/32	10.2.112.131 – 10.2.112.131	10.2.112.131
5	10.2.112.132/32	10.2.112.132 – 10.2.112.132	10.2.112.132
6	10.2.112.133/32	10.2.112.133 – 10.2.112.133	10.2.112.133
7	10.2.112.134/32	10.2.112.134 – 10.2.112.134	10.2.112.134
8	10.2.112.135/32	10.2.112.135 – 10.2.112.135	10.2.112.135
9	10.2.112.136/32	10.2.112.136 – 10.2.112.136	10.2.112.136
10	10.2.112.137/32	10.2.112.137 – 10.2.112.137	10.2.112.137
11	10.2.112.138/32	10.2.112.138 – 10.2.112.138	10.2.112.138
12	10.2.112.139/32	10.2.112.139 – 10.2.112.139	10.2.112.139
13	10.2.112.140/32	10.2.112.140 – 10.2.112.140	10.2.112.140
14	10.2.112.141/32	10.2.112.141 – 10.2.112.141	10.2.112.141
15	10.2.112.142/32	10.2.112.142 – 10.2.112.142	10.2.112.142
16	10.2.112.143/32	10.2.112.143 – 10.2.112.143	10.2.112.143
17	10.2.112.144/32	10.2.112.144 – 10.2.112.144	10.2.112.144
18	10.2.112.145/32	10.2.112.145 – 10.2.112.145	10.2.112.145
19	10.2.112.146/32	10.2.112.146 – 10.2.112.146	10.2.112.146
20	10.2.112.147/32	10.2.112.147 – 10.2.112.147	10.2.112.147
21	10.2.112.148/32	10.2.112.148 – 10.2.112.148	10.2.112.148
22	10.2.112.149/32	10.2.112.149 – 10.2.112.149	10.2.112.149
23	10.2.112.150/32	10.2.112.150 – 10.2.112.150	10.2.112.150
24	10.2.112.151/32	10.2.112.151 – 10.2.112.151	10.2.112.151
25	10.2.112.152/32	10.2.112.152 – 10.2.112.152	10.2.112.152
26	10.2.112.153/32	10.2.112.153 – 10.2.112.153	10.2.112.153
27	10.2.112.154/32	10.2.112.154 – 10.2.112.154	10.2.112.154
28	10.2.112.155/32	10.2.112.155 – 10.2.112.155	10.2.112.155
29	10.2.112.156/32	10.2.112.156 – 10.2.112.156	10.2.112.156
30	10.2.112.157/32	10.2.112.157 – 10.2.112.157	10.2.112.157
31	10.2.112.158/32	10.2.112.158 – 10.2.112.158	10.2.112.158
32	10.2.112.159/32	10.2.112.159 – 10.2.112.159	10.2.112.159
33	10.2.112.160/32	10.2.112.160 – 10.2.112.160	10.2.112.160
34	10.2.112.161/32	10.2.112.161 – 10.2.112.161	10.2.112.161
35	10.2.112.162/32	10.2.112.162 – 10.2.112.162	10.2.112.162
36	10.2.112.163/32	10.2.112.163 – 10.2.112.163	10.2.112.163
37	10.2.112.164/32	10.2.112.164 – 10.2.112.164	10.2.112.164
38	10.2.112.165/32	10.2.112.165 – 10.2.112.165	10.2.112.165
39	10.2.112.166/32	10.2.112.166 – 10.2.112.166	10.2.112.166
40	10.2.112.167/32	10.2.112.167 – 10.2.112.167	10.2.112.167
41	10.2.112.168/32	10.2.112.168 – 10.2.112.168	10.2.112.168
42	10.2.112.169/32	10.2.112.169 – 10.2.112.169	10.2.112.169
43	10.2.112.170/32	10.2.112.170 – 10.2.112.170	10.2.112.170
44	10.2.112.171/32	10.2.112.171 – 10.2.112.171	10.2.112.171
45	10.2.112.172/32	10.2.112.172 – 10.2.112.172	10.2.112.172
46	10.2.112.173/32	10.2.112.173 – 10.2.112.173	10.2.112.173
47	10.2.112.174/32	10.2.112.174 – 10.2.112.174	10.2.112.174
48	10.2.112.175/32	10.2.112.175 – 10.2.112.175	10.2.112.175
49	10.2.112.176/32	10.2.112.176 – 10.2.112.176	10.2.112.176
50	10.2.112.177/32	10.2.112.177 – 10.2.112.177	10.2.112.177
51	10.2.112.178/32	10.2.112.178 – 10.2.112.178	10.2.112.178
52	10.2.112.179/32	10.2.112.179 – 10.2.112.179	10.2.112.179
53	10.2.112.180/32	10.2.112.180 – 10.2.112.180	10.2.112.180
54	10.2.112.181/32	10.2.112.181 – 10.2.112.181	10.2.112.181
55	10.2.112.182/32	10.2.112.182 – 10.2.112.182	10.2.112.182
56	10.2.112.183/32	10.2.112.183 – 10.2.112.183	10.2.112.183
57	10.2.112.184/32	10.2.112.184 – 10.2.112.184	10.2.112.184
58	10.2.112.185/32	10.2.112.185 – 10.2.112.185	10.2.112.185
59	10.2.112.186/32	10.2.112.186 – 10.2.112.186	10.2.112.186
60	10.2.112.187/32	10.2.112.187 – 10.2.112.187	10.2.112.187
61	10.2.112.188/32	10.2.112.188 – 10.2.112.188	10.2.112.188
62	10.2.112.189/32	10.2.112.189 – 10.2.112.189	10.2.112.189
63	10.2.112.190/32	10.2.112.190 – 10.2.112.190	10.2.112.190
64	10.2.112.191/32	10.2.112.191 – 10.2.112.191	10.2.112.191
65	10.2.112.192/32	10.2.112.192 – 10.2.112.192	10.2.112.192
66	10.2.112.193/32	10.2.112.193 – 10.2.112.193	10.2.112.193
67	10.2.112.194/32	10.2.112.194 – 10.2.112.194	10.2.112.194
68	10.2.112.195/32	10.2.112.195 – 10.2.112.195	10.2.112.195
69	10.2.112.196/32	10.2.112.196 – 10.2.112.196	10.2.112.196
70	10.2.112.197/32	10.2.112.197 – 10.2.112.197	10.2.112.197
71	10.2.112.198/32	10.2.112.198 – 10.2.112.198	10.2.112.198
72	10.2.112.199/32	10.2.112.199 – 10.2.112.199	10.2.112.199
73	10.2.112.200/32	10.2.112.200 – 10.2.112.200	10.2.112.200
74	10.2.112.201/32	10.2.112.201 – 10.2.112.201	10.2.112.201
75	10.2.112.202/32	10.2.112.202 – 10.2.112.202	10.2.112.202
76	10.2.112.203/32	10.2.112.203 – 10.2.112.203	10.2.112.203
77	10.2.112.204/32	10.2.112.204 – 10.2.112.204	10.2.112.204
78	10.2.112.205/32	10.2.112.205 – 10.2.112.205	10.2.112.205
79	10.2.112.206/32	10.2.112.206 – 10.2.112.206	10.2.112.206
80	10.2.112.207/32	10.2.112.207 – 10.2.112.207	10.2.112.207
81	10.2.112.208/32	10.2.112.208 – 10.2.112.208	10.2.112.208
82	10.2.112.209/32	10.2.112.209 – 10.2.112.209	10.2.112.209
83	10.2.112.210/32	10.2.112.210 – 10.2.112.210	10.2.112.210
84	10.2.112.211/32	10.2.112.211 – 10.2.112.211	10.2.112.211
85	10.2.112.212/32	10.2.112.212 – 10.2.112.212	10.2.112.212
86	10.2.112.213/32	10.2.112.213 – 10.2.112.213	10.2.112.213
87	10.2.112.214/32	10.2.112.214 – 10.2.112.214	10.2.112.214
88	10.2.112.215/32	10.2.112.215 – 10.2.112.215	10.2.112.215
89	10.2.112.216/32	10.2.112.216 – 10.2.112.216	10.2.112.216
90	10.2.112.217/32	10.2.112.217 – 10.2.112.217	10.2.112.217
91	10.2.112.218/32	10.2.112.218 – 10.2.112.218	10.2.112.218
92	10.2.112.219/32	10.2.112.219 – 10.2.112.219	10.2.112.219
93	10.2.112.220/32	10.2.112.220 – 10.2.112.220	10.2.112.220
94	10.2.112.221/32	10.2.112.221 – 10.2.112.221	10.2.112.221
95	10.2.112.222/32	10.2.112.222 – 10.2.112.222	10.2.112.222
96	10.2.112.223/32	10.2.112.223 – 10.2.112.223	10.2.112.223
97	10.2.112.224/32	10.2.112.224 – 10.2.112.224	10.2.112.224
98	10.2.112.225/32	10.2.112.225 – 10.2.112.225	10.2.112.225
99	10.2.112.226/32	10.2.112.226 – 10.2.112.226	10.2.112.226
100	10.2.112.227/32	10.2.112.227 – 10.2.112.227	10.2.112.227
101	10.2.112.228/32	10.2.112.228 – 10.2.112.228	10.2.112.228
102	10.2.112.229/32	10.2.112.229 – 10.2.112.229	10.2.112.229
103	10.2.112.230/32	10.2.112.230 – 10.2.112.230	10.2.112.230
104	10.2.112.231/32	10.2.112.231 – 10.2.112.231	10.2.112.231
105	10.2.112.232/32	10.2.112.232 – 10.2.112.232	10.2.112.232
106	10.2.112.233/32	10.2.112.233 – 10.2.112.233	10.2.112.233
107	10.2.112.234/32	10.2.112.234 – 10.2.112.234	10.2.112.234
108	10.2.112.235/32	10.2.112.235 – 10.2.112.235	10.2.112.235
109	10.2.112.236/32	10.2.112.236 – 10.2.112.236	10.2.112.236
110	10.2.112.237/32	10.2.112.237 – 10.2.112.237	10.2.112.237
111	10.2.112.238/32	10.2.112.238 – 10.2.112.238	10.2.112.238
112	10.2.112.239/32	10.2.112.239 – 10.2.112.239	10.2.112.239
113	10.2.112.240/32	10.2.112.240 – 10.2.112.240	10.2.112.240
114	10.2.112.241/32	10.2.112.241 – 10.2.112.241	10.2.112.241
115	10.2.112.242/32	10.2.112.242 – 10.2.112.242	10.2.112.242
116	10.2.112.243/32	10.2.112.243 – 10.2.112.243	10.2.112.243
117	10.2.112.244/32	10.2.112.244 – 10.2.112.244	10.2.112.244
118	10.2.112.245/32	10.2.112.245 – 10.2.112.245	10.2.112.245
119	10.2.112.246/32	10.2.112.246 – 10.2.112.246	10.2.112.246
120	10.2.112.247/32	10.2.112.247 – 10.2.112.247	10.2.112.247
121	10.2.112.248/32	10.2.112.248 – 10.2.112.248	10.2.112.248
122	10.2.112.249/32	10.2.112.249 – 10.2.112.249	10.2.112.249
123	10.2.112.250/32	10.2.112.250 – 10.2.112.250	10.2.112.250
124	10.2.112.251/32	10.2.112.251 – 10.2.112.251	10.2.112.251
125	10.2.112.252/32	10.2.112.252 – 10.2.112.252	10.2.112.252
126	10.2.112.253/32	10.2.112.253 – 10.2.112.253	10.2.112.253
127	10.2.112.254/32	10.2.112.254 – 10.2.112.254	10.2.112.254
128	10.2.112.255/32	10.2.112.255 – 10.2.112.255	10.2.112.255

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 →