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)10.2.183.128/25

network10.2.183.128/25

broadcast10.2.183.255

first host10.2.183.129

last host10.2.183.254

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.2.183.128/25

address00001010.00000010.10110111.10000000

subnet mask11111111.11111111.11111111.10000000

network00001010.00000010.10110111.10000000

broadcast00001010.00000010.10110111.11111111

green = network part, grey = host part

hex0x0a02b780

decimal167950208

reverse dns128.183.2.10.in-addr.arpa

ipv4-mapped::ffff:a02:b780

/25 split into /32 · 128 subnets

close ×

#	network	host range	broadcast
1	10.2.183.128/32	10.2.183.128 – 10.2.183.128	10.2.183.128
2	10.2.183.129/32	10.2.183.129 – 10.2.183.129	10.2.183.129
3	10.2.183.130/32	10.2.183.130 – 10.2.183.130	10.2.183.130
4	10.2.183.131/32	10.2.183.131 – 10.2.183.131	10.2.183.131
5	10.2.183.132/32	10.2.183.132 – 10.2.183.132	10.2.183.132
6	10.2.183.133/32	10.2.183.133 – 10.2.183.133	10.2.183.133
7	10.2.183.134/32	10.2.183.134 – 10.2.183.134	10.2.183.134
8	10.2.183.135/32	10.2.183.135 – 10.2.183.135	10.2.183.135
9	10.2.183.136/32	10.2.183.136 – 10.2.183.136	10.2.183.136
10	10.2.183.137/32	10.2.183.137 – 10.2.183.137	10.2.183.137
11	10.2.183.138/32	10.2.183.138 – 10.2.183.138	10.2.183.138
12	10.2.183.139/32	10.2.183.139 – 10.2.183.139	10.2.183.139
13	10.2.183.140/32	10.2.183.140 – 10.2.183.140	10.2.183.140
14	10.2.183.141/32	10.2.183.141 – 10.2.183.141	10.2.183.141
15	10.2.183.142/32	10.2.183.142 – 10.2.183.142	10.2.183.142
16	10.2.183.143/32	10.2.183.143 – 10.2.183.143	10.2.183.143
17	10.2.183.144/32	10.2.183.144 – 10.2.183.144	10.2.183.144
18	10.2.183.145/32	10.2.183.145 – 10.2.183.145	10.2.183.145
19	10.2.183.146/32	10.2.183.146 – 10.2.183.146	10.2.183.146
20	10.2.183.147/32	10.2.183.147 – 10.2.183.147	10.2.183.147
21	10.2.183.148/32	10.2.183.148 – 10.2.183.148	10.2.183.148
22	10.2.183.149/32	10.2.183.149 – 10.2.183.149	10.2.183.149
23	10.2.183.150/32	10.2.183.150 – 10.2.183.150	10.2.183.150
24	10.2.183.151/32	10.2.183.151 – 10.2.183.151	10.2.183.151
25	10.2.183.152/32	10.2.183.152 – 10.2.183.152	10.2.183.152
26	10.2.183.153/32	10.2.183.153 – 10.2.183.153	10.2.183.153
27	10.2.183.154/32	10.2.183.154 – 10.2.183.154	10.2.183.154
28	10.2.183.155/32	10.2.183.155 – 10.2.183.155	10.2.183.155
29	10.2.183.156/32	10.2.183.156 – 10.2.183.156	10.2.183.156
30	10.2.183.157/32	10.2.183.157 – 10.2.183.157	10.2.183.157
31	10.2.183.158/32	10.2.183.158 – 10.2.183.158	10.2.183.158
32	10.2.183.159/32	10.2.183.159 – 10.2.183.159	10.2.183.159
33	10.2.183.160/32	10.2.183.160 – 10.2.183.160	10.2.183.160
34	10.2.183.161/32	10.2.183.161 – 10.2.183.161	10.2.183.161
35	10.2.183.162/32	10.2.183.162 – 10.2.183.162	10.2.183.162
36	10.2.183.163/32	10.2.183.163 – 10.2.183.163	10.2.183.163
37	10.2.183.164/32	10.2.183.164 – 10.2.183.164	10.2.183.164
38	10.2.183.165/32	10.2.183.165 – 10.2.183.165	10.2.183.165
39	10.2.183.166/32	10.2.183.166 – 10.2.183.166	10.2.183.166
40	10.2.183.167/32	10.2.183.167 – 10.2.183.167	10.2.183.167
41	10.2.183.168/32	10.2.183.168 – 10.2.183.168	10.2.183.168
42	10.2.183.169/32	10.2.183.169 – 10.2.183.169	10.2.183.169
43	10.2.183.170/32	10.2.183.170 – 10.2.183.170	10.2.183.170
44	10.2.183.171/32	10.2.183.171 – 10.2.183.171	10.2.183.171
45	10.2.183.172/32	10.2.183.172 – 10.2.183.172	10.2.183.172
46	10.2.183.173/32	10.2.183.173 – 10.2.183.173	10.2.183.173
47	10.2.183.174/32	10.2.183.174 – 10.2.183.174	10.2.183.174
48	10.2.183.175/32	10.2.183.175 – 10.2.183.175	10.2.183.175
49	10.2.183.176/32	10.2.183.176 – 10.2.183.176	10.2.183.176
50	10.2.183.177/32	10.2.183.177 – 10.2.183.177	10.2.183.177
51	10.2.183.178/32	10.2.183.178 – 10.2.183.178	10.2.183.178
52	10.2.183.179/32	10.2.183.179 – 10.2.183.179	10.2.183.179
53	10.2.183.180/32	10.2.183.180 – 10.2.183.180	10.2.183.180
54	10.2.183.181/32	10.2.183.181 – 10.2.183.181	10.2.183.181
55	10.2.183.182/32	10.2.183.182 – 10.2.183.182	10.2.183.182
56	10.2.183.183/32	10.2.183.183 – 10.2.183.183	10.2.183.183
57	10.2.183.184/32	10.2.183.184 – 10.2.183.184	10.2.183.184
58	10.2.183.185/32	10.2.183.185 – 10.2.183.185	10.2.183.185
59	10.2.183.186/32	10.2.183.186 – 10.2.183.186	10.2.183.186
60	10.2.183.187/32	10.2.183.187 – 10.2.183.187	10.2.183.187
61	10.2.183.188/32	10.2.183.188 – 10.2.183.188	10.2.183.188
62	10.2.183.189/32	10.2.183.189 – 10.2.183.189	10.2.183.189
63	10.2.183.190/32	10.2.183.190 – 10.2.183.190	10.2.183.190
64	10.2.183.191/32	10.2.183.191 – 10.2.183.191	10.2.183.191
65	10.2.183.192/32	10.2.183.192 – 10.2.183.192	10.2.183.192
66	10.2.183.193/32	10.2.183.193 – 10.2.183.193	10.2.183.193
67	10.2.183.194/32	10.2.183.194 – 10.2.183.194	10.2.183.194
68	10.2.183.195/32	10.2.183.195 – 10.2.183.195	10.2.183.195
69	10.2.183.196/32	10.2.183.196 – 10.2.183.196	10.2.183.196
70	10.2.183.197/32	10.2.183.197 – 10.2.183.197	10.2.183.197
71	10.2.183.198/32	10.2.183.198 – 10.2.183.198	10.2.183.198
72	10.2.183.199/32	10.2.183.199 – 10.2.183.199	10.2.183.199
73	10.2.183.200/32	10.2.183.200 – 10.2.183.200	10.2.183.200
74	10.2.183.201/32	10.2.183.201 – 10.2.183.201	10.2.183.201
75	10.2.183.202/32	10.2.183.202 – 10.2.183.202	10.2.183.202
76	10.2.183.203/32	10.2.183.203 – 10.2.183.203	10.2.183.203
77	10.2.183.204/32	10.2.183.204 – 10.2.183.204	10.2.183.204
78	10.2.183.205/32	10.2.183.205 – 10.2.183.205	10.2.183.205
79	10.2.183.206/32	10.2.183.206 – 10.2.183.206	10.2.183.206
80	10.2.183.207/32	10.2.183.207 – 10.2.183.207	10.2.183.207
81	10.2.183.208/32	10.2.183.208 – 10.2.183.208	10.2.183.208
82	10.2.183.209/32	10.2.183.209 – 10.2.183.209	10.2.183.209
83	10.2.183.210/32	10.2.183.210 – 10.2.183.210	10.2.183.210
84	10.2.183.211/32	10.2.183.211 – 10.2.183.211	10.2.183.211
85	10.2.183.212/32	10.2.183.212 – 10.2.183.212	10.2.183.212
86	10.2.183.213/32	10.2.183.213 – 10.2.183.213	10.2.183.213
87	10.2.183.214/32	10.2.183.214 – 10.2.183.214	10.2.183.214
88	10.2.183.215/32	10.2.183.215 – 10.2.183.215	10.2.183.215
89	10.2.183.216/32	10.2.183.216 – 10.2.183.216	10.2.183.216
90	10.2.183.217/32	10.2.183.217 – 10.2.183.217	10.2.183.217
91	10.2.183.218/32	10.2.183.218 – 10.2.183.218	10.2.183.218
92	10.2.183.219/32	10.2.183.219 – 10.2.183.219	10.2.183.219
93	10.2.183.220/32	10.2.183.220 – 10.2.183.220	10.2.183.220
94	10.2.183.221/32	10.2.183.221 – 10.2.183.221	10.2.183.221
95	10.2.183.222/32	10.2.183.222 – 10.2.183.222	10.2.183.222
96	10.2.183.223/32	10.2.183.223 – 10.2.183.223	10.2.183.223
97	10.2.183.224/32	10.2.183.224 – 10.2.183.224	10.2.183.224
98	10.2.183.225/32	10.2.183.225 – 10.2.183.225	10.2.183.225
99	10.2.183.226/32	10.2.183.226 – 10.2.183.226	10.2.183.226
100	10.2.183.227/32	10.2.183.227 – 10.2.183.227	10.2.183.227
101	10.2.183.228/32	10.2.183.228 – 10.2.183.228	10.2.183.228
102	10.2.183.229/32	10.2.183.229 – 10.2.183.229	10.2.183.229
103	10.2.183.230/32	10.2.183.230 – 10.2.183.230	10.2.183.230
104	10.2.183.231/32	10.2.183.231 – 10.2.183.231	10.2.183.231
105	10.2.183.232/32	10.2.183.232 – 10.2.183.232	10.2.183.232
106	10.2.183.233/32	10.2.183.233 – 10.2.183.233	10.2.183.233
107	10.2.183.234/32	10.2.183.234 – 10.2.183.234	10.2.183.234
108	10.2.183.235/32	10.2.183.235 – 10.2.183.235	10.2.183.235
109	10.2.183.236/32	10.2.183.236 – 10.2.183.236	10.2.183.236
110	10.2.183.237/32	10.2.183.237 – 10.2.183.237	10.2.183.237
111	10.2.183.238/32	10.2.183.238 – 10.2.183.238	10.2.183.238
112	10.2.183.239/32	10.2.183.239 – 10.2.183.239	10.2.183.239
113	10.2.183.240/32	10.2.183.240 – 10.2.183.240	10.2.183.240
114	10.2.183.241/32	10.2.183.241 – 10.2.183.241	10.2.183.241
115	10.2.183.242/32	10.2.183.242 – 10.2.183.242	10.2.183.242
116	10.2.183.243/32	10.2.183.243 – 10.2.183.243	10.2.183.243
117	10.2.183.244/32	10.2.183.244 – 10.2.183.244	10.2.183.244
118	10.2.183.245/32	10.2.183.245 – 10.2.183.245	10.2.183.245
119	10.2.183.246/32	10.2.183.246 – 10.2.183.246	10.2.183.246
120	10.2.183.247/32	10.2.183.247 – 10.2.183.247	10.2.183.247
121	10.2.183.248/32	10.2.183.248 – 10.2.183.248	10.2.183.248
122	10.2.183.249/32	10.2.183.249 – 10.2.183.249	10.2.183.249
123	10.2.183.250/32	10.2.183.250 – 10.2.183.250	10.2.183.250
124	10.2.183.251/32	10.2.183.251 – 10.2.183.251	10.2.183.251
125	10.2.183.252/32	10.2.183.252 – 10.2.183.252	10.2.183.252
126	10.2.183.253/32	10.2.183.253 – 10.2.183.253	10.2.183.253
127	10.2.183.254/32	10.2.183.254 – 10.2.183.254	10.2.183.254
128	10.2.183.255/32	10.2.183.255 – 10.2.183.255	10.2.183.255

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 →