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)10.0.108.128/25

network10.0.108.128/25

broadcast10.0.108.255

first host10.0.108.129

last host10.0.108.254

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.0.108.128/25

address00001010.00000000.01101100.10000000

subnet mask11111111.11111111.11111111.10000000

network00001010.00000000.01101100.10000000

broadcast00001010.00000000.01101100.11111111

green = network part, grey = host part

hex0x0a006c80

decimal167799936

reverse dns128.108.0.10.in-addr.arpa

ipv4-mapped::ffff:a00:6c80

/25 split into /32 · 128 subnets

close ×

#	network	host range	broadcast
1	10.0.108.128/32	10.0.108.128 – 10.0.108.128	10.0.108.128
2	10.0.108.129/32	10.0.108.129 – 10.0.108.129	10.0.108.129
3	10.0.108.130/32	10.0.108.130 – 10.0.108.130	10.0.108.130
4	10.0.108.131/32	10.0.108.131 – 10.0.108.131	10.0.108.131
5	10.0.108.132/32	10.0.108.132 – 10.0.108.132	10.0.108.132
6	10.0.108.133/32	10.0.108.133 – 10.0.108.133	10.0.108.133
7	10.0.108.134/32	10.0.108.134 – 10.0.108.134	10.0.108.134
8	10.0.108.135/32	10.0.108.135 – 10.0.108.135	10.0.108.135
9	10.0.108.136/32	10.0.108.136 – 10.0.108.136	10.0.108.136
10	10.0.108.137/32	10.0.108.137 – 10.0.108.137	10.0.108.137
11	10.0.108.138/32	10.0.108.138 – 10.0.108.138	10.0.108.138
12	10.0.108.139/32	10.0.108.139 – 10.0.108.139	10.0.108.139
13	10.0.108.140/32	10.0.108.140 – 10.0.108.140	10.0.108.140
14	10.0.108.141/32	10.0.108.141 – 10.0.108.141	10.0.108.141
15	10.0.108.142/32	10.0.108.142 – 10.0.108.142	10.0.108.142
16	10.0.108.143/32	10.0.108.143 – 10.0.108.143	10.0.108.143
17	10.0.108.144/32	10.0.108.144 – 10.0.108.144	10.0.108.144
18	10.0.108.145/32	10.0.108.145 – 10.0.108.145	10.0.108.145
19	10.0.108.146/32	10.0.108.146 – 10.0.108.146	10.0.108.146
20	10.0.108.147/32	10.0.108.147 – 10.0.108.147	10.0.108.147
21	10.0.108.148/32	10.0.108.148 – 10.0.108.148	10.0.108.148
22	10.0.108.149/32	10.0.108.149 – 10.0.108.149	10.0.108.149
23	10.0.108.150/32	10.0.108.150 – 10.0.108.150	10.0.108.150
24	10.0.108.151/32	10.0.108.151 – 10.0.108.151	10.0.108.151
25	10.0.108.152/32	10.0.108.152 – 10.0.108.152	10.0.108.152
26	10.0.108.153/32	10.0.108.153 – 10.0.108.153	10.0.108.153
27	10.0.108.154/32	10.0.108.154 – 10.0.108.154	10.0.108.154
28	10.0.108.155/32	10.0.108.155 – 10.0.108.155	10.0.108.155
29	10.0.108.156/32	10.0.108.156 – 10.0.108.156	10.0.108.156
30	10.0.108.157/32	10.0.108.157 – 10.0.108.157	10.0.108.157
31	10.0.108.158/32	10.0.108.158 – 10.0.108.158	10.0.108.158
32	10.0.108.159/32	10.0.108.159 – 10.0.108.159	10.0.108.159
33	10.0.108.160/32	10.0.108.160 – 10.0.108.160	10.0.108.160
34	10.0.108.161/32	10.0.108.161 – 10.0.108.161	10.0.108.161
35	10.0.108.162/32	10.0.108.162 – 10.0.108.162	10.0.108.162
36	10.0.108.163/32	10.0.108.163 – 10.0.108.163	10.0.108.163
37	10.0.108.164/32	10.0.108.164 – 10.0.108.164	10.0.108.164
38	10.0.108.165/32	10.0.108.165 – 10.0.108.165	10.0.108.165
39	10.0.108.166/32	10.0.108.166 – 10.0.108.166	10.0.108.166
40	10.0.108.167/32	10.0.108.167 – 10.0.108.167	10.0.108.167
41	10.0.108.168/32	10.0.108.168 – 10.0.108.168	10.0.108.168
42	10.0.108.169/32	10.0.108.169 – 10.0.108.169	10.0.108.169
43	10.0.108.170/32	10.0.108.170 – 10.0.108.170	10.0.108.170
44	10.0.108.171/32	10.0.108.171 – 10.0.108.171	10.0.108.171
45	10.0.108.172/32	10.0.108.172 – 10.0.108.172	10.0.108.172
46	10.0.108.173/32	10.0.108.173 – 10.0.108.173	10.0.108.173
47	10.0.108.174/32	10.0.108.174 – 10.0.108.174	10.0.108.174
48	10.0.108.175/32	10.0.108.175 – 10.0.108.175	10.0.108.175
49	10.0.108.176/32	10.0.108.176 – 10.0.108.176	10.0.108.176
50	10.0.108.177/32	10.0.108.177 – 10.0.108.177	10.0.108.177
51	10.0.108.178/32	10.0.108.178 – 10.0.108.178	10.0.108.178
52	10.0.108.179/32	10.0.108.179 – 10.0.108.179	10.0.108.179
53	10.0.108.180/32	10.0.108.180 – 10.0.108.180	10.0.108.180
54	10.0.108.181/32	10.0.108.181 – 10.0.108.181	10.0.108.181
55	10.0.108.182/32	10.0.108.182 – 10.0.108.182	10.0.108.182
56	10.0.108.183/32	10.0.108.183 – 10.0.108.183	10.0.108.183
57	10.0.108.184/32	10.0.108.184 – 10.0.108.184	10.0.108.184
58	10.0.108.185/32	10.0.108.185 – 10.0.108.185	10.0.108.185
59	10.0.108.186/32	10.0.108.186 – 10.0.108.186	10.0.108.186
60	10.0.108.187/32	10.0.108.187 – 10.0.108.187	10.0.108.187
61	10.0.108.188/32	10.0.108.188 – 10.0.108.188	10.0.108.188
62	10.0.108.189/32	10.0.108.189 – 10.0.108.189	10.0.108.189
63	10.0.108.190/32	10.0.108.190 – 10.0.108.190	10.0.108.190
64	10.0.108.191/32	10.0.108.191 – 10.0.108.191	10.0.108.191
65	10.0.108.192/32	10.0.108.192 – 10.0.108.192	10.0.108.192
66	10.0.108.193/32	10.0.108.193 – 10.0.108.193	10.0.108.193
67	10.0.108.194/32	10.0.108.194 – 10.0.108.194	10.0.108.194
68	10.0.108.195/32	10.0.108.195 – 10.0.108.195	10.0.108.195
69	10.0.108.196/32	10.0.108.196 – 10.0.108.196	10.0.108.196
70	10.0.108.197/32	10.0.108.197 – 10.0.108.197	10.0.108.197
71	10.0.108.198/32	10.0.108.198 – 10.0.108.198	10.0.108.198
72	10.0.108.199/32	10.0.108.199 – 10.0.108.199	10.0.108.199
73	10.0.108.200/32	10.0.108.200 – 10.0.108.200	10.0.108.200
74	10.0.108.201/32	10.0.108.201 – 10.0.108.201	10.0.108.201
75	10.0.108.202/32	10.0.108.202 – 10.0.108.202	10.0.108.202
76	10.0.108.203/32	10.0.108.203 – 10.0.108.203	10.0.108.203
77	10.0.108.204/32	10.0.108.204 – 10.0.108.204	10.0.108.204
78	10.0.108.205/32	10.0.108.205 – 10.0.108.205	10.0.108.205
79	10.0.108.206/32	10.0.108.206 – 10.0.108.206	10.0.108.206
80	10.0.108.207/32	10.0.108.207 – 10.0.108.207	10.0.108.207
81	10.0.108.208/32	10.0.108.208 – 10.0.108.208	10.0.108.208
82	10.0.108.209/32	10.0.108.209 – 10.0.108.209	10.0.108.209
83	10.0.108.210/32	10.0.108.210 – 10.0.108.210	10.0.108.210
84	10.0.108.211/32	10.0.108.211 – 10.0.108.211	10.0.108.211
85	10.0.108.212/32	10.0.108.212 – 10.0.108.212	10.0.108.212
86	10.0.108.213/32	10.0.108.213 – 10.0.108.213	10.0.108.213
87	10.0.108.214/32	10.0.108.214 – 10.0.108.214	10.0.108.214
88	10.0.108.215/32	10.0.108.215 – 10.0.108.215	10.0.108.215
89	10.0.108.216/32	10.0.108.216 – 10.0.108.216	10.0.108.216
90	10.0.108.217/32	10.0.108.217 – 10.0.108.217	10.0.108.217
91	10.0.108.218/32	10.0.108.218 – 10.0.108.218	10.0.108.218
92	10.0.108.219/32	10.0.108.219 – 10.0.108.219	10.0.108.219
93	10.0.108.220/32	10.0.108.220 – 10.0.108.220	10.0.108.220
94	10.0.108.221/32	10.0.108.221 – 10.0.108.221	10.0.108.221
95	10.0.108.222/32	10.0.108.222 – 10.0.108.222	10.0.108.222
96	10.0.108.223/32	10.0.108.223 – 10.0.108.223	10.0.108.223
97	10.0.108.224/32	10.0.108.224 – 10.0.108.224	10.0.108.224
98	10.0.108.225/32	10.0.108.225 – 10.0.108.225	10.0.108.225
99	10.0.108.226/32	10.0.108.226 – 10.0.108.226	10.0.108.226
100	10.0.108.227/32	10.0.108.227 – 10.0.108.227	10.0.108.227
101	10.0.108.228/32	10.0.108.228 – 10.0.108.228	10.0.108.228
102	10.0.108.229/32	10.0.108.229 – 10.0.108.229	10.0.108.229
103	10.0.108.230/32	10.0.108.230 – 10.0.108.230	10.0.108.230
104	10.0.108.231/32	10.0.108.231 – 10.0.108.231	10.0.108.231
105	10.0.108.232/32	10.0.108.232 – 10.0.108.232	10.0.108.232
106	10.0.108.233/32	10.0.108.233 – 10.0.108.233	10.0.108.233
107	10.0.108.234/32	10.0.108.234 – 10.0.108.234	10.0.108.234
108	10.0.108.235/32	10.0.108.235 – 10.0.108.235	10.0.108.235
109	10.0.108.236/32	10.0.108.236 – 10.0.108.236	10.0.108.236
110	10.0.108.237/32	10.0.108.237 – 10.0.108.237	10.0.108.237
111	10.0.108.238/32	10.0.108.238 – 10.0.108.238	10.0.108.238
112	10.0.108.239/32	10.0.108.239 – 10.0.108.239	10.0.108.239
113	10.0.108.240/32	10.0.108.240 – 10.0.108.240	10.0.108.240
114	10.0.108.241/32	10.0.108.241 – 10.0.108.241	10.0.108.241
115	10.0.108.242/32	10.0.108.242 – 10.0.108.242	10.0.108.242
116	10.0.108.243/32	10.0.108.243 – 10.0.108.243	10.0.108.243
117	10.0.108.244/32	10.0.108.244 – 10.0.108.244	10.0.108.244
118	10.0.108.245/32	10.0.108.245 – 10.0.108.245	10.0.108.245
119	10.0.108.246/32	10.0.108.246 – 10.0.108.246	10.0.108.246
120	10.0.108.247/32	10.0.108.247 – 10.0.108.247	10.0.108.247
121	10.0.108.248/32	10.0.108.248 – 10.0.108.248	10.0.108.248
122	10.0.108.249/32	10.0.108.249 – 10.0.108.249	10.0.108.249
123	10.0.108.250/32	10.0.108.250 – 10.0.108.250	10.0.108.250
124	10.0.108.251/32	10.0.108.251 – 10.0.108.251	10.0.108.251
125	10.0.108.252/32	10.0.108.252 – 10.0.108.252	10.0.108.252
126	10.0.108.253/32	10.0.108.253 – 10.0.108.253	10.0.108.253
127	10.0.108.254/32	10.0.108.254 – 10.0.108.254	10.0.108.254
128	10.0.108.255/32	10.0.108.255 – 10.0.108.255	10.0.108.255

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 →