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)10.3.164.128/25

network10.3.164.128/25

broadcast10.3.164.255

first host10.3.164.129

last host10.3.164.254

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.3.164.128/25

address00001010.00000011.10100100.10000000

subnet mask11111111.11111111.11111111.10000000

network00001010.00000011.10100100.10000000

broadcast00001010.00000011.10100100.11111111

green = network part, grey = host part

hex0x0a03a480

decimal168010880

reverse dns128.164.3.10.in-addr.arpa

ipv4-mapped::ffff:a03:a480

/25 split into /32 · 128 subnets

close ×

#	network	host range	broadcast
1	10.3.164.128/32	10.3.164.128 – 10.3.164.128	10.3.164.128
2	10.3.164.129/32	10.3.164.129 – 10.3.164.129	10.3.164.129
3	10.3.164.130/32	10.3.164.130 – 10.3.164.130	10.3.164.130
4	10.3.164.131/32	10.3.164.131 – 10.3.164.131	10.3.164.131
5	10.3.164.132/32	10.3.164.132 – 10.3.164.132	10.3.164.132
6	10.3.164.133/32	10.3.164.133 – 10.3.164.133	10.3.164.133
7	10.3.164.134/32	10.3.164.134 – 10.3.164.134	10.3.164.134
8	10.3.164.135/32	10.3.164.135 – 10.3.164.135	10.3.164.135
9	10.3.164.136/32	10.3.164.136 – 10.3.164.136	10.3.164.136
10	10.3.164.137/32	10.3.164.137 – 10.3.164.137	10.3.164.137
11	10.3.164.138/32	10.3.164.138 – 10.3.164.138	10.3.164.138
12	10.3.164.139/32	10.3.164.139 – 10.3.164.139	10.3.164.139
13	10.3.164.140/32	10.3.164.140 – 10.3.164.140	10.3.164.140
14	10.3.164.141/32	10.3.164.141 – 10.3.164.141	10.3.164.141
15	10.3.164.142/32	10.3.164.142 – 10.3.164.142	10.3.164.142
16	10.3.164.143/32	10.3.164.143 – 10.3.164.143	10.3.164.143
17	10.3.164.144/32	10.3.164.144 – 10.3.164.144	10.3.164.144
18	10.3.164.145/32	10.3.164.145 – 10.3.164.145	10.3.164.145
19	10.3.164.146/32	10.3.164.146 – 10.3.164.146	10.3.164.146
20	10.3.164.147/32	10.3.164.147 – 10.3.164.147	10.3.164.147
21	10.3.164.148/32	10.3.164.148 – 10.3.164.148	10.3.164.148
22	10.3.164.149/32	10.3.164.149 – 10.3.164.149	10.3.164.149
23	10.3.164.150/32	10.3.164.150 – 10.3.164.150	10.3.164.150
24	10.3.164.151/32	10.3.164.151 – 10.3.164.151	10.3.164.151
25	10.3.164.152/32	10.3.164.152 – 10.3.164.152	10.3.164.152
26	10.3.164.153/32	10.3.164.153 – 10.3.164.153	10.3.164.153
27	10.3.164.154/32	10.3.164.154 – 10.3.164.154	10.3.164.154
28	10.3.164.155/32	10.3.164.155 – 10.3.164.155	10.3.164.155
29	10.3.164.156/32	10.3.164.156 – 10.3.164.156	10.3.164.156
30	10.3.164.157/32	10.3.164.157 – 10.3.164.157	10.3.164.157
31	10.3.164.158/32	10.3.164.158 – 10.3.164.158	10.3.164.158
32	10.3.164.159/32	10.3.164.159 – 10.3.164.159	10.3.164.159
33	10.3.164.160/32	10.3.164.160 – 10.3.164.160	10.3.164.160
34	10.3.164.161/32	10.3.164.161 – 10.3.164.161	10.3.164.161
35	10.3.164.162/32	10.3.164.162 – 10.3.164.162	10.3.164.162
36	10.3.164.163/32	10.3.164.163 – 10.3.164.163	10.3.164.163
37	10.3.164.164/32	10.3.164.164 – 10.3.164.164	10.3.164.164
38	10.3.164.165/32	10.3.164.165 – 10.3.164.165	10.3.164.165
39	10.3.164.166/32	10.3.164.166 – 10.3.164.166	10.3.164.166
40	10.3.164.167/32	10.3.164.167 – 10.3.164.167	10.3.164.167
41	10.3.164.168/32	10.3.164.168 – 10.3.164.168	10.3.164.168
42	10.3.164.169/32	10.3.164.169 – 10.3.164.169	10.3.164.169
43	10.3.164.170/32	10.3.164.170 – 10.3.164.170	10.3.164.170
44	10.3.164.171/32	10.3.164.171 – 10.3.164.171	10.3.164.171
45	10.3.164.172/32	10.3.164.172 – 10.3.164.172	10.3.164.172
46	10.3.164.173/32	10.3.164.173 – 10.3.164.173	10.3.164.173
47	10.3.164.174/32	10.3.164.174 – 10.3.164.174	10.3.164.174
48	10.3.164.175/32	10.3.164.175 – 10.3.164.175	10.3.164.175
49	10.3.164.176/32	10.3.164.176 – 10.3.164.176	10.3.164.176
50	10.3.164.177/32	10.3.164.177 – 10.3.164.177	10.3.164.177
51	10.3.164.178/32	10.3.164.178 – 10.3.164.178	10.3.164.178
52	10.3.164.179/32	10.3.164.179 – 10.3.164.179	10.3.164.179
53	10.3.164.180/32	10.3.164.180 – 10.3.164.180	10.3.164.180
54	10.3.164.181/32	10.3.164.181 – 10.3.164.181	10.3.164.181
55	10.3.164.182/32	10.3.164.182 – 10.3.164.182	10.3.164.182
56	10.3.164.183/32	10.3.164.183 – 10.3.164.183	10.3.164.183
57	10.3.164.184/32	10.3.164.184 – 10.3.164.184	10.3.164.184
58	10.3.164.185/32	10.3.164.185 – 10.3.164.185	10.3.164.185
59	10.3.164.186/32	10.3.164.186 – 10.3.164.186	10.3.164.186
60	10.3.164.187/32	10.3.164.187 – 10.3.164.187	10.3.164.187
61	10.3.164.188/32	10.3.164.188 – 10.3.164.188	10.3.164.188
62	10.3.164.189/32	10.3.164.189 – 10.3.164.189	10.3.164.189
63	10.3.164.190/32	10.3.164.190 – 10.3.164.190	10.3.164.190
64	10.3.164.191/32	10.3.164.191 – 10.3.164.191	10.3.164.191
65	10.3.164.192/32	10.3.164.192 – 10.3.164.192	10.3.164.192
66	10.3.164.193/32	10.3.164.193 – 10.3.164.193	10.3.164.193
67	10.3.164.194/32	10.3.164.194 – 10.3.164.194	10.3.164.194
68	10.3.164.195/32	10.3.164.195 – 10.3.164.195	10.3.164.195
69	10.3.164.196/32	10.3.164.196 – 10.3.164.196	10.3.164.196
70	10.3.164.197/32	10.3.164.197 – 10.3.164.197	10.3.164.197
71	10.3.164.198/32	10.3.164.198 – 10.3.164.198	10.3.164.198
72	10.3.164.199/32	10.3.164.199 – 10.3.164.199	10.3.164.199
73	10.3.164.200/32	10.3.164.200 – 10.3.164.200	10.3.164.200
74	10.3.164.201/32	10.3.164.201 – 10.3.164.201	10.3.164.201
75	10.3.164.202/32	10.3.164.202 – 10.3.164.202	10.3.164.202
76	10.3.164.203/32	10.3.164.203 – 10.3.164.203	10.3.164.203
77	10.3.164.204/32	10.3.164.204 – 10.3.164.204	10.3.164.204
78	10.3.164.205/32	10.3.164.205 – 10.3.164.205	10.3.164.205
79	10.3.164.206/32	10.3.164.206 – 10.3.164.206	10.3.164.206
80	10.3.164.207/32	10.3.164.207 – 10.3.164.207	10.3.164.207
81	10.3.164.208/32	10.3.164.208 – 10.3.164.208	10.3.164.208
82	10.3.164.209/32	10.3.164.209 – 10.3.164.209	10.3.164.209
83	10.3.164.210/32	10.3.164.210 – 10.3.164.210	10.3.164.210
84	10.3.164.211/32	10.3.164.211 – 10.3.164.211	10.3.164.211
85	10.3.164.212/32	10.3.164.212 – 10.3.164.212	10.3.164.212
86	10.3.164.213/32	10.3.164.213 – 10.3.164.213	10.3.164.213
87	10.3.164.214/32	10.3.164.214 – 10.3.164.214	10.3.164.214
88	10.3.164.215/32	10.3.164.215 – 10.3.164.215	10.3.164.215
89	10.3.164.216/32	10.3.164.216 – 10.3.164.216	10.3.164.216
90	10.3.164.217/32	10.3.164.217 – 10.3.164.217	10.3.164.217
91	10.3.164.218/32	10.3.164.218 – 10.3.164.218	10.3.164.218
92	10.3.164.219/32	10.3.164.219 – 10.3.164.219	10.3.164.219
93	10.3.164.220/32	10.3.164.220 – 10.3.164.220	10.3.164.220
94	10.3.164.221/32	10.3.164.221 – 10.3.164.221	10.3.164.221
95	10.3.164.222/32	10.3.164.222 – 10.3.164.222	10.3.164.222
96	10.3.164.223/32	10.3.164.223 – 10.3.164.223	10.3.164.223
97	10.3.164.224/32	10.3.164.224 – 10.3.164.224	10.3.164.224
98	10.3.164.225/32	10.3.164.225 – 10.3.164.225	10.3.164.225
99	10.3.164.226/32	10.3.164.226 – 10.3.164.226	10.3.164.226
100	10.3.164.227/32	10.3.164.227 – 10.3.164.227	10.3.164.227
101	10.3.164.228/32	10.3.164.228 – 10.3.164.228	10.3.164.228
102	10.3.164.229/32	10.3.164.229 – 10.3.164.229	10.3.164.229
103	10.3.164.230/32	10.3.164.230 – 10.3.164.230	10.3.164.230
104	10.3.164.231/32	10.3.164.231 – 10.3.164.231	10.3.164.231
105	10.3.164.232/32	10.3.164.232 – 10.3.164.232	10.3.164.232
106	10.3.164.233/32	10.3.164.233 – 10.3.164.233	10.3.164.233
107	10.3.164.234/32	10.3.164.234 – 10.3.164.234	10.3.164.234
108	10.3.164.235/32	10.3.164.235 – 10.3.164.235	10.3.164.235
109	10.3.164.236/32	10.3.164.236 – 10.3.164.236	10.3.164.236
110	10.3.164.237/32	10.3.164.237 – 10.3.164.237	10.3.164.237
111	10.3.164.238/32	10.3.164.238 – 10.3.164.238	10.3.164.238
112	10.3.164.239/32	10.3.164.239 – 10.3.164.239	10.3.164.239
113	10.3.164.240/32	10.3.164.240 – 10.3.164.240	10.3.164.240
114	10.3.164.241/32	10.3.164.241 – 10.3.164.241	10.3.164.241
115	10.3.164.242/32	10.3.164.242 – 10.3.164.242	10.3.164.242
116	10.3.164.243/32	10.3.164.243 – 10.3.164.243	10.3.164.243
117	10.3.164.244/32	10.3.164.244 – 10.3.164.244	10.3.164.244
118	10.3.164.245/32	10.3.164.245 – 10.3.164.245	10.3.164.245
119	10.3.164.246/32	10.3.164.246 – 10.3.164.246	10.3.164.246
120	10.3.164.247/32	10.3.164.247 – 10.3.164.247	10.3.164.247
121	10.3.164.248/32	10.3.164.248 – 10.3.164.248	10.3.164.248
122	10.3.164.249/32	10.3.164.249 – 10.3.164.249	10.3.164.249
123	10.3.164.250/32	10.3.164.250 – 10.3.164.250	10.3.164.250
124	10.3.164.251/32	10.3.164.251 – 10.3.164.251	10.3.164.251
125	10.3.164.252/32	10.3.164.252 – 10.3.164.252	10.3.164.252
126	10.3.164.253/32	10.3.164.253 – 10.3.164.253	10.3.164.253
127	10.3.164.254/32	10.3.164.254 – 10.3.164.254	10.3.164.254
128	10.3.164.255/32	10.3.164.255 – 10.3.164.255	10.3.164.255

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 →