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)192.168.1.128/25

network192.168.1.128/25

broadcast192.168.1.255

first host192.168.1.129

last host192.168.1.254

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classC

ipcalc 192.168.1.128/25

address11000000.10101000.00000001.10000000

subnet mask11111111.11111111.11111111.10000000

network11000000.10101000.00000001.10000000

broadcast11000000.10101000.00000001.11111111

green = network part, grey = host part

hex0xc0a80180

decimal3232235904

reverse dns128.1.168.192.in-addr.arpa

ipv4-mapped::ffff:c0a8:180

/25 split into /32 · 128 subnets

close ×

#	network	host range	broadcast
1	192.168.1.128/32	192.168.1.128 – 192.168.1.128	192.168.1.128
2	192.168.1.129/32	192.168.1.129 – 192.168.1.129	192.168.1.129
3	192.168.1.130/32	192.168.1.130 – 192.168.1.130	192.168.1.130
4	192.168.1.131/32	192.168.1.131 – 192.168.1.131	192.168.1.131
5	192.168.1.132/32	192.168.1.132 – 192.168.1.132	192.168.1.132
6	192.168.1.133/32	192.168.1.133 – 192.168.1.133	192.168.1.133
7	192.168.1.134/32	192.168.1.134 – 192.168.1.134	192.168.1.134
8	192.168.1.135/32	192.168.1.135 – 192.168.1.135	192.168.1.135
9	192.168.1.136/32	192.168.1.136 – 192.168.1.136	192.168.1.136
10	192.168.1.137/32	192.168.1.137 – 192.168.1.137	192.168.1.137
11	192.168.1.138/32	192.168.1.138 – 192.168.1.138	192.168.1.138
12	192.168.1.139/32	192.168.1.139 – 192.168.1.139	192.168.1.139
13	192.168.1.140/32	192.168.1.140 – 192.168.1.140	192.168.1.140
14	192.168.1.141/32	192.168.1.141 – 192.168.1.141	192.168.1.141
15	192.168.1.142/32	192.168.1.142 – 192.168.1.142	192.168.1.142
16	192.168.1.143/32	192.168.1.143 – 192.168.1.143	192.168.1.143
17	192.168.1.144/32	192.168.1.144 – 192.168.1.144	192.168.1.144
18	192.168.1.145/32	192.168.1.145 – 192.168.1.145	192.168.1.145
19	192.168.1.146/32	192.168.1.146 – 192.168.1.146	192.168.1.146
20	192.168.1.147/32	192.168.1.147 – 192.168.1.147	192.168.1.147
21	192.168.1.148/32	192.168.1.148 – 192.168.1.148	192.168.1.148
22	192.168.1.149/32	192.168.1.149 – 192.168.1.149	192.168.1.149
23	192.168.1.150/32	192.168.1.150 – 192.168.1.150	192.168.1.150
24	192.168.1.151/32	192.168.1.151 – 192.168.1.151	192.168.1.151
25	192.168.1.152/32	192.168.1.152 – 192.168.1.152	192.168.1.152
26	192.168.1.153/32	192.168.1.153 – 192.168.1.153	192.168.1.153
27	192.168.1.154/32	192.168.1.154 – 192.168.1.154	192.168.1.154
28	192.168.1.155/32	192.168.1.155 – 192.168.1.155	192.168.1.155
29	192.168.1.156/32	192.168.1.156 – 192.168.1.156	192.168.1.156
30	192.168.1.157/32	192.168.1.157 – 192.168.1.157	192.168.1.157
31	192.168.1.158/32	192.168.1.158 – 192.168.1.158	192.168.1.158
32	192.168.1.159/32	192.168.1.159 – 192.168.1.159	192.168.1.159
33	192.168.1.160/32	192.168.1.160 – 192.168.1.160	192.168.1.160
34	192.168.1.161/32	192.168.1.161 – 192.168.1.161	192.168.1.161
35	192.168.1.162/32	192.168.1.162 – 192.168.1.162	192.168.1.162
36	192.168.1.163/32	192.168.1.163 – 192.168.1.163	192.168.1.163
37	192.168.1.164/32	192.168.1.164 – 192.168.1.164	192.168.1.164
38	192.168.1.165/32	192.168.1.165 – 192.168.1.165	192.168.1.165
39	192.168.1.166/32	192.168.1.166 – 192.168.1.166	192.168.1.166
40	192.168.1.167/32	192.168.1.167 – 192.168.1.167	192.168.1.167
41	192.168.1.168/32	192.168.1.168 – 192.168.1.168	192.168.1.168
42	192.168.1.169/32	192.168.1.169 – 192.168.1.169	192.168.1.169
43	192.168.1.170/32	192.168.1.170 – 192.168.1.170	192.168.1.170
44	192.168.1.171/32	192.168.1.171 – 192.168.1.171	192.168.1.171
45	192.168.1.172/32	192.168.1.172 – 192.168.1.172	192.168.1.172
46	192.168.1.173/32	192.168.1.173 – 192.168.1.173	192.168.1.173
47	192.168.1.174/32	192.168.1.174 – 192.168.1.174	192.168.1.174
48	192.168.1.175/32	192.168.1.175 – 192.168.1.175	192.168.1.175
49	192.168.1.176/32	192.168.1.176 – 192.168.1.176	192.168.1.176
50	192.168.1.177/32	192.168.1.177 – 192.168.1.177	192.168.1.177
51	192.168.1.178/32	192.168.1.178 – 192.168.1.178	192.168.1.178
52	192.168.1.179/32	192.168.1.179 – 192.168.1.179	192.168.1.179
53	192.168.1.180/32	192.168.1.180 – 192.168.1.180	192.168.1.180
54	192.168.1.181/32	192.168.1.181 – 192.168.1.181	192.168.1.181
55	192.168.1.182/32	192.168.1.182 – 192.168.1.182	192.168.1.182
56	192.168.1.183/32	192.168.1.183 – 192.168.1.183	192.168.1.183
57	192.168.1.184/32	192.168.1.184 – 192.168.1.184	192.168.1.184
58	192.168.1.185/32	192.168.1.185 – 192.168.1.185	192.168.1.185
59	192.168.1.186/32	192.168.1.186 – 192.168.1.186	192.168.1.186
60	192.168.1.187/32	192.168.1.187 – 192.168.1.187	192.168.1.187
61	192.168.1.188/32	192.168.1.188 – 192.168.1.188	192.168.1.188
62	192.168.1.189/32	192.168.1.189 – 192.168.1.189	192.168.1.189
63	192.168.1.190/32	192.168.1.190 – 192.168.1.190	192.168.1.190
64	192.168.1.191/32	192.168.1.191 – 192.168.1.191	192.168.1.191
65	192.168.1.192/32	192.168.1.192 – 192.168.1.192	192.168.1.192
66	192.168.1.193/32	192.168.1.193 – 192.168.1.193	192.168.1.193
67	192.168.1.194/32	192.168.1.194 – 192.168.1.194	192.168.1.194
68	192.168.1.195/32	192.168.1.195 – 192.168.1.195	192.168.1.195
69	192.168.1.196/32	192.168.1.196 – 192.168.1.196	192.168.1.196
70	192.168.1.197/32	192.168.1.197 – 192.168.1.197	192.168.1.197
71	192.168.1.198/32	192.168.1.198 – 192.168.1.198	192.168.1.198
72	192.168.1.199/32	192.168.1.199 – 192.168.1.199	192.168.1.199
73	192.168.1.200/32	192.168.1.200 – 192.168.1.200	192.168.1.200
74	192.168.1.201/32	192.168.1.201 – 192.168.1.201	192.168.1.201
75	192.168.1.202/32	192.168.1.202 – 192.168.1.202	192.168.1.202
76	192.168.1.203/32	192.168.1.203 – 192.168.1.203	192.168.1.203
77	192.168.1.204/32	192.168.1.204 – 192.168.1.204	192.168.1.204
78	192.168.1.205/32	192.168.1.205 – 192.168.1.205	192.168.1.205
79	192.168.1.206/32	192.168.1.206 – 192.168.1.206	192.168.1.206
80	192.168.1.207/32	192.168.1.207 – 192.168.1.207	192.168.1.207
81	192.168.1.208/32	192.168.1.208 – 192.168.1.208	192.168.1.208
82	192.168.1.209/32	192.168.1.209 – 192.168.1.209	192.168.1.209
83	192.168.1.210/32	192.168.1.210 – 192.168.1.210	192.168.1.210
84	192.168.1.211/32	192.168.1.211 – 192.168.1.211	192.168.1.211
85	192.168.1.212/32	192.168.1.212 – 192.168.1.212	192.168.1.212
86	192.168.1.213/32	192.168.1.213 – 192.168.1.213	192.168.1.213
87	192.168.1.214/32	192.168.1.214 – 192.168.1.214	192.168.1.214
88	192.168.1.215/32	192.168.1.215 – 192.168.1.215	192.168.1.215
89	192.168.1.216/32	192.168.1.216 – 192.168.1.216	192.168.1.216
90	192.168.1.217/32	192.168.1.217 – 192.168.1.217	192.168.1.217
91	192.168.1.218/32	192.168.1.218 – 192.168.1.218	192.168.1.218
92	192.168.1.219/32	192.168.1.219 – 192.168.1.219	192.168.1.219
93	192.168.1.220/32	192.168.1.220 – 192.168.1.220	192.168.1.220
94	192.168.1.221/32	192.168.1.221 – 192.168.1.221	192.168.1.221
95	192.168.1.222/32	192.168.1.222 – 192.168.1.222	192.168.1.222
96	192.168.1.223/32	192.168.1.223 – 192.168.1.223	192.168.1.223
97	192.168.1.224/32	192.168.1.224 – 192.168.1.224	192.168.1.224
98	192.168.1.225/32	192.168.1.225 – 192.168.1.225	192.168.1.225
99	192.168.1.226/32	192.168.1.226 – 192.168.1.226	192.168.1.226
100	192.168.1.227/32	192.168.1.227 – 192.168.1.227	192.168.1.227
101	192.168.1.228/32	192.168.1.228 – 192.168.1.228	192.168.1.228
102	192.168.1.229/32	192.168.1.229 – 192.168.1.229	192.168.1.229
103	192.168.1.230/32	192.168.1.230 – 192.168.1.230	192.168.1.230
104	192.168.1.231/32	192.168.1.231 – 192.168.1.231	192.168.1.231
105	192.168.1.232/32	192.168.1.232 – 192.168.1.232	192.168.1.232
106	192.168.1.233/32	192.168.1.233 – 192.168.1.233	192.168.1.233
107	192.168.1.234/32	192.168.1.234 – 192.168.1.234	192.168.1.234
108	192.168.1.235/32	192.168.1.235 – 192.168.1.235	192.168.1.235
109	192.168.1.236/32	192.168.1.236 – 192.168.1.236	192.168.1.236
110	192.168.1.237/32	192.168.1.237 – 192.168.1.237	192.168.1.237
111	192.168.1.238/32	192.168.1.238 – 192.168.1.238	192.168.1.238
112	192.168.1.239/32	192.168.1.239 – 192.168.1.239	192.168.1.239
113	192.168.1.240/32	192.168.1.240 – 192.168.1.240	192.168.1.240
114	192.168.1.241/32	192.168.1.241 – 192.168.1.241	192.168.1.241
115	192.168.1.242/32	192.168.1.242 – 192.168.1.242	192.168.1.242
116	192.168.1.243/32	192.168.1.243 – 192.168.1.243	192.168.1.243
117	192.168.1.244/32	192.168.1.244 – 192.168.1.244	192.168.1.244
118	192.168.1.245/32	192.168.1.245 – 192.168.1.245	192.168.1.245
119	192.168.1.246/32	192.168.1.246 – 192.168.1.246	192.168.1.246
120	192.168.1.247/32	192.168.1.247 – 192.168.1.247	192.168.1.247
121	192.168.1.248/32	192.168.1.248 – 192.168.1.248	192.168.1.248
122	192.168.1.249/32	192.168.1.249 – 192.168.1.249	192.168.1.249
123	192.168.1.250/32	192.168.1.250 – 192.168.1.250	192.168.1.250
124	192.168.1.251/32	192.168.1.251 – 192.168.1.251	192.168.1.251
125	192.168.1.252/32	192.168.1.252 – 192.168.1.252	192.168.1.252
126	192.168.1.253/32	192.168.1.253 – 192.168.1.253	192.168.1.253
127	192.168.1.254/32	192.168.1.254 – 192.168.1.254	192.168.1.254
128	192.168.1.255/32	192.168.1.255 – 192.168.1.255	192.168.1.255

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 →