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)10.158.76.128/25

network10.158.76.128/25

broadcast10.158.76.255

first host10.158.76.129

last host10.158.76.254

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.158.76.128/25

address00001010.10011110.01001100.10000000

subnet mask11111111.11111111.11111111.10000000

network00001010.10011110.01001100.10000000

broadcast00001010.10011110.01001100.11111111

green = network part, grey = host part

hex0x0a9e4c80

decimal178146432

reverse dns128.76.158.10.in-addr.arpa

ipv4-mapped::ffff:a9e:4c80

/25 split into /32 · 128 subnets

close ×

#	network	host range	broadcast
1	10.158.76.128/32	10.158.76.128 – 10.158.76.128	10.158.76.128
2	10.158.76.129/32	10.158.76.129 – 10.158.76.129	10.158.76.129
3	10.158.76.130/32	10.158.76.130 – 10.158.76.130	10.158.76.130
4	10.158.76.131/32	10.158.76.131 – 10.158.76.131	10.158.76.131
5	10.158.76.132/32	10.158.76.132 – 10.158.76.132	10.158.76.132
6	10.158.76.133/32	10.158.76.133 – 10.158.76.133	10.158.76.133
7	10.158.76.134/32	10.158.76.134 – 10.158.76.134	10.158.76.134
8	10.158.76.135/32	10.158.76.135 – 10.158.76.135	10.158.76.135
9	10.158.76.136/32	10.158.76.136 – 10.158.76.136	10.158.76.136
10	10.158.76.137/32	10.158.76.137 – 10.158.76.137	10.158.76.137
11	10.158.76.138/32	10.158.76.138 – 10.158.76.138	10.158.76.138
12	10.158.76.139/32	10.158.76.139 – 10.158.76.139	10.158.76.139
13	10.158.76.140/32	10.158.76.140 – 10.158.76.140	10.158.76.140
14	10.158.76.141/32	10.158.76.141 – 10.158.76.141	10.158.76.141
15	10.158.76.142/32	10.158.76.142 – 10.158.76.142	10.158.76.142
16	10.158.76.143/32	10.158.76.143 – 10.158.76.143	10.158.76.143
17	10.158.76.144/32	10.158.76.144 – 10.158.76.144	10.158.76.144
18	10.158.76.145/32	10.158.76.145 – 10.158.76.145	10.158.76.145
19	10.158.76.146/32	10.158.76.146 – 10.158.76.146	10.158.76.146
20	10.158.76.147/32	10.158.76.147 – 10.158.76.147	10.158.76.147
21	10.158.76.148/32	10.158.76.148 – 10.158.76.148	10.158.76.148
22	10.158.76.149/32	10.158.76.149 – 10.158.76.149	10.158.76.149
23	10.158.76.150/32	10.158.76.150 – 10.158.76.150	10.158.76.150
24	10.158.76.151/32	10.158.76.151 – 10.158.76.151	10.158.76.151
25	10.158.76.152/32	10.158.76.152 – 10.158.76.152	10.158.76.152
26	10.158.76.153/32	10.158.76.153 – 10.158.76.153	10.158.76.153
27	10.158.76.154/32	10.158.76.154 – 10.158.76.154	10.158.76.154
28	10.158.76.155/32	10.158.76.155 – 10.158.76.155	10.158.76.155
29	10.158.76.156/32	10.158.76.156 – 10.158.76.156	10.158.76.156
30	10.158.76.157/32	10.158.76.157 – 10.158.76.157	10.158.76.157
31	10.158.76.158/32	10.158.76.158 – 10.158.76.158	10.158.76.158
32	10.158.76.159/32	10.158.76.159 – 10.158.76.159	10.158.76.159
33	10.158.76.160/32	10.158.76.160 – 10.158.76.160	10.158.76.160
34	10.158.76.161/32	10.158.76.161 – 10.158.76.161	10.158.76.161
35	10.158.76.162/32	10.158.76.162 – 10.158.76.162	10.158.76.162
36	10.158.76.163/32	10.158.76.163 – 10.158.76.163	10.158.76.163
37	10.158.76.164/32	10.158.76.164 – 10.158.76.164	10.158.76.164
38	10.158.76.165/32	10.158.76.165 – 10.158.76.165	10.158.76.165
39	10.158.76.166/32	10.158.76.166 – 10.158.76.166	10.158.76.166
40	10.158.76.167/32	10.158.76.167 – 10.158.76.167	10.158.76.167
41	10.158.76.168/32	10.158.76.168 – 10.158.76.168	10.158.76.168
42	10.158.76.169/32	10.158.76.169 – 10.158.76.169	10.158.76.169
43	10.158.76.170/32	10.158.76.170 – 10.158.76.170	10.158.76.170
44	10.158.76.171/32	10.158.76.171 – 10.158.76.171	10.158.76.171
45	10.158.76.172/32	10.158.76.172 – 10.158.76.172	10.158.76.172
46	10.158.76.173/32	10.158.76.173 – 10.158.76.173	10.158.76.173
47	10.158.76.174/32	10.158.76.174 – 10.158.76.174	10.158.76.174
48	10.158.76.175/32	10.158.76.175 – 10.158.76.175	10.158.76.175
49	10.158.76.176/32	10.158.76.176 – 10.158.76.176	10.158.76.176
50	10.158.76.177/32	10.158.76.177 – 10.158.76.177	10.158.76.177
51	10.158.76.178/32	10.158.76.178 – 10.158.76.178	10.158.76.178
52	10.158.76.179/32	10.158.76.179 – 10.158.76.179	10.158.76.179
53	10.158.76.180/32	10.158.76.180 – 10.158.76.180	10.158.76.180
54	10.158.76.181/32	10.158.76.181 – 10.158.76.181	10.158.76.181
55	10.158.76.182/32	10.158.76.182 – 10.158.76.182	10.158.76.182
56	10.158.76.183/32	10.158.76.183 – 10.158.76.183	10.158.76.183
57	10.158.76.184/32	10.158.76.184 – 10.158.76.184	10.158.76.184
58	10.158.76.185/32	10.158.76.185 – 10.158.76.185	10.158.76.185
59	10.158.76.186/32	10.158.76.186 – 10.158.76.186	10.158.76.186
60	10.158.76.187/32	10.158.76.187 – 10.158.76.187	10.158.76.187
61	10.158.76.188/32	10.158.76.188 – 10.158.76.188	10.158.76.188
62	10.158.76.189/32	10.158.76.189 – 10.158.76.189	10.158.76.189
63	10.158.76.190/32	10.158.76.190 – 10.158.76.190	10.158.76.190
64	10.158.76.191/32	10.158.76.191 – 10.158.76.191	10.158.76.191
65	10.158.76.192/32	10.158.76.192 – 10.158.76.192	10.158.76.192
66	10.158.76.193/32	10.158.76.193 – 10.158.76.193	10.158.76.193
67	10.158.76.194/32	10.158.76.194 – 10.158.76.194	10.158.76.194
68	10.158.76.195/32	10.158.76.195 – 10.158.76.195	10.158.76.195
69	10.158.76.196/32	10.158.76.196 – 10.158.76.196	10.158.76.196
70	10.158.76.197/32	10.158.76.197 – 10.158.76.197	10.158.76.197
71	10.158.76.198/32	10.158.76.198 – 10.158.76.198	10.158.76.198
72	10.158.76.199/32	10.158.76.199 – 10.158.76.199	10.158.76.199
73	10.158.76.200/32	10.158.76.200 – 10.158.76.200	10.158.76.200
74	10.158.76.201/32	10.158.76.201 – 10.158.76.201	10.158.76.201
75	10.158.76.202/32	10.158.76.202 – 10.158.76.202	10.158.76.202
76	10.158.76.203/32	10.158.76.203 – 10.158.76.203	10.158.76.203
77	10.158.76.204/32	10.158.76.204 – 10.158.76.204	10.158.76.204
78	10.158.76.205/32	10.158.76.205 – 10.158.76.205	10.158.76.205
79	10.158.76.206/32	10.158.76.206 – 10.158.76.206	10.158.76.206
80	10.158.76.207/32	10.158.76.207 – 10.158.76.207	10.158.76.207
81	10.158.76.208/32	10.158.76.208 – 10.158.76.208	10.158.76.208
82	10.158.76.209/32	10.158.76.209 – 10.158.76.209	10.158.76.209
83	10.158.76.210/32	10.158.76.210 – 10.158.76.210	10.158.76.210
84	10.158.76.211/32	10.158.76.211 – 10.158.76.211	10.158.76.211
85	10.158.76.212/32	10.158.76.212 – 10.158.76.212	10.158.76.212
86	10.158.76.213/32	10.158.76.213 – 10.158.76.213	10.158.76.213
87	10.158.76.214/32	10.158.76.214 – 10.158.76.214	10.158.76.214
88	10.158.76.215/32	10.158.76.215 – 10.158.76.215	10.158.76.215
89	10.158.76.216/32	10.158.76.216 – 10.158.76.216	10.158.76.216
90	10.158.76.217/32	10.158.76.217 – 10.158.76.217	10.158.76.217
91	10.158.76.218/32	10.158.76.218 – 10.158.76.218	10.158.76.218
92	10.158.76.219/32	10.158.76.219 – 10.158.76.219	10.158.76.219
93	10.158.76.220/32	10.158.76.220 – 10.158.76.220	10.158.76.220
94	10.158.76.221/32	10.158.76.221 – 10.158.76.221	10.158.76.221
95	10.158.76.222/32	10.158.76.222 – 10.158.76.222	10.158.76.222
96	10.158.76.223/32	10.158.76.223 – 10.158.76.223	10.158.76.223
97	10.158.76.224/32	10.158.76.224 – 10.158.76.224	10.158.76.224
98	10.158.76.225/32	10.158.76.225 – 10.158.76.225	10.158.76.225
99	10.158.76.226/32	10.158.76.226 – 10.158.76.226	10.158.76.226
100	10.158.76.227/32	10.158.76.227 – 10.158.76.227	10.158.76.227
101	10.158.76.228/32	10.158.76.228 – 10.158.76.228	10.158.76.228
102	10.158.76.229/32	10.158.76.229 – 10.158.76.229	10.158.76.229
103	10.158.76.230/32	10.158.76.230 – 10.158.76.230	10.158.76.230
104	10.158.76.231/32	10.158.76.231 – 10.158.76.231	10.158.76.231
105	10.158.76.232/32	10.158.76.232 – 10.158.76.232	10.158.76.232
106	10.158.76.233/32	10.158.76.233 – 10.158.76.233	10.158.76.233
107	10.158.76.234/32	10.158.76.234 – 10.158.76.234	10.158.76.234
108	10.158.76.235/32	10.158.76.235 – 10.158.76.235	10.158.76.235
109	10.158.76.236/32	10.158.76.236 – 10.158.76.236	10.158.76.236
110	10.158.76.237/32	10.158.76.237 – 10.158.76.237	10.158.76.237
111	10.158.76.238/32	10.158.76.238 – 10.158.76.238	10.158.76.238
112	10.158.76.239/32	10.158.76.239 – 10.158.76.239	10.158.76.239
113	10.158.76.240/32	10.158.76.240 – 10.158.76.240	10.158.76.240
114	10.158.76.241/32	10.158.76.241 – 10.158.76.241	10.158.76.241
115	10.158.76.242/32	10.158.76.242 – 10.158.76.242	10.158.76.242
116	10.158.76.243/32	10.158.76.243 – 10.158.76.243	10.158.76.243
117	10.158.76.244/32	10.158.76.244 – 10.158.76.244	10.158.76.244
118	10.158.76.245/32	10.158.76.245 – 10.158.76.245	10.158.76.245
119	10.158.76.246/32	10.158.76.246 – 10.158.76.246	10.158.76.246
120	10.158.76.247/32	10.158.76.247 – 10.158.76.247	10.158.76.247
121	10.158.76.248/32	10.158.76.248 – 10.158.76.248	10.158.76.248
122	10.158.76.249/32	10.158.76.249 – 10.158.76.249	10.158.76.249
123	10.158.76.250/32	10.158.76.250 – 10.158.76.250	10.158.76.250
124	10.158.76.251/32	10.158.76.251 – 10.158.76.251	10.158.76.251
125	10.158.76.252/32	10.158.76.252 – 10.158.76.252	10.158.76.252
126	10.158.76.253/32	10.158.76.253 – 10.158.76.253	10.158.76.253
127	10.158.76.254/32	10.158.76.254 – 10.158.76.254	10.158.76.254
128	10.158.76.255/32	10.158.76.255 – 10.158.76.255	10.158.76.255

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 →