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)10.0.6.128/25

network10.0.6.128/25

broadcast10.0.6.255

first host10.0.6.129

last host10.0.6.254

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.0.6.128/25

address00001010.00000000.00000110.10000000

subnet mask11111111.11111111.11111111.10000000

network00001010.00000000.00000110.10000000

broadcast00001010.00000000.00000110.11111111

green = network part, grey = host part

hex0x0a000680

decimal167773824

reverse dns128.6.0.10.in-addr.arpa

ipv4-mapped::ffff:a00:680

/25 split into /32 · 128 subnets

close ×

#	network	host range	broadcast
1	10.0.6.128/32	10.0.6.128 – 10.0.6.128	10.0.6.128
2	10.0.6.129/32	10.0.6.129 – 10.0.6.129	10.0.6.129
3	10.0.6.130/32	10.0.6.130 – 10.0.6.130	10.0.6.130
4	10.0.6.131/32	10.0.6.131 – 10.0.6.131	10.0.6.131
5	10.0.6.132/32	10.0.6.132 – 10.0.6.132	10.0.6.132
6	10.0.6.133/32	10.0.6.133 – 10.0.6.133	10.0.6.133
7	10.0.6.134/32	10.0.6.134 – 10.0.6.134	10.0.6.134
8	10.0.6.135/32	10.0.6.135 – 10.0.6.135	10.0.6.135
9	10.0.6.136/32	10.0.6.136 – 10.0.6.136	10.0.6.136
10	10.0.6.137/32	10.0.6.137 – 10.0.6.137	10.0.6.137
11	10.0.6.138/32	10.0.6.138 – 10.0.6.138	10.0.6.138
12	10.0.6.139/32	10.0.6.139 – 10.0.6.139	10.0.6.139
13	10.0.6.140/32	10.0.6.140 – 10.0.6.140	10.0.6.140
14	10.0.6.141/32	10.0.6.141 – 10.0.6.141	10.0.6.141
15	10.0.6.142/32	10.0.6.142 – 10.0.6.142	10.0.6.142
16	10.0.6.143/32	10.0.6.143 – 10.0.6.143	10.0.6.143
17	10.0.6.144/32	10.0.6.144 – 10.0.6.144	10.0.6.144
18	10.0.6.145/32	10.0.6.145 – 10.0.6.145	10.0.6.145
19	10.0.6.146/32	10.0.6.146 – 10.0.6.146	10.0.6.146
20	10.0.6.147/32	10.0.6.147 – 10.0.6.147	10.0.6.147
21	10.0.6.148/32	10.0.6.148 – 10.0.6.148	10.0.6.148
22	10.0.6.149/32	10.0.6.149 – 10.0.6.149	10.0.6.149
23	10.0.6.150/32	10.0.6.150 – 10.0.6.150	10.0.6.150
24	10.0.6.151/32	10.0.6.151 – 10.0.6.151	10.0.6.151
25	10.0.6.152/32	10.0.6.152 – 10.0.6.152	10.0.6.152
26	10.0.6.153/32	10.0.6.153 – 10.0.6.153	10.0.6.153
27	10.0.6.154/32	10.0.6.154 – 10.0.6.154	10.0.6.154
28	10.0.6.155/32	10.0.6.155 – 10.0.6.155	10.0.6.155
29	10.0.6.156/32	10.0.6.156 – 10.0.6.156	10.0.6.156
30	10.0.6.157/32	10.0.6.157 – 10.0.6.157	10.0.6.157
31	10.0.6.158/32	10.0.6.158 – 10.0.6.158	10.0.6.158
32	10.0.6.159/32	10.0.6.159 – 10.0.6.159	10.0.6.159
33	10.0.6.160/32	10.0.6.160 – 10.0.6.160	10.0.6.160
34	10.0.6.161/32	10.0.6.161 – 10.0.6.161	10.0.6.161
35	10.0.6.162/32	10.0.6.162 – 10.0.6.162	10.0.6.162
36	10.0.6.163/32	10.0.6.163 – 10.0.6.163	10.0.6.163
37	10.0.6.164/32	10.0.6.164 – 10.0.6.164	10.0.6.164
38	10.0.6.165/32	10.0.6.165 – 10.0.6.165	10.0.6.165
39	10.0.6.166/32	10.0.6.166 – 10.0.6.166	10.0.6.166
40	10.0.6.167/32	10.0.6.167 – 10.0.6.167	10.0.6.167
41	10.0.6.168/32	10.0.6.168 – 10.0.6.168	10.0.6.168
42	10.0.6.169/32	10.0.6.169 – 10.0.6.169	10.0.6.169
43	10.0.6.170/32	10.0.6.170 – 10.0.6.170	10.0.6.170
44	10.0.6.171/32	10.0.6.171 – 10.0.6.171	10.0.6.171
45	10.0.6.172/32	10.0.6.172 – 10.0.6.172	10.0.6.172
46	10.0.6.173/32	10.0.6.173 – 10.0.6.173	10.0.6.173
47	10.0.6.174/32	10.0.6.174 – 10.0.6.174	10.0.6.174
48	10.0.6.175/32	10.0.6.175 – 10.0.6.175	10.0.6.175
49	10.0.6.176/32	10.0.6.176 – 10.0.6.176	10.0.6.176
50	10.0.6.177/32	10.0.6.177 – 10.0.6.177	10.0.6.177
51	10.0.6.178/32	10.0.6.178 – 10.0.6.178	10.0.6.178
52	10.0.6.179/32	10.0.6.179 – 10.0.6.179	10.0.6.179
53	10.0.6.180/32	10.0.6.180 – 10.0.6.180	10.0.6.180
54	10.0.6.181/32	10.0.6.181 – 10.0.6.181	10.0.6.181
55	10.0.6.182/32	10.0.6.182 – 10.0.6.182	10.0.6.182
56	10.0.6.183/32	10.0.6.183 – 10.0.6.183	10.0.6.183
57	10.0.6.184/32	10.0.6.184 – 10.0.6.184	10.0.6.184
58	10.0.6.185/32	10.0.6.185 – 10.0.6.185	10.0.6.185
59	10.0.6.186/32	10.0.6.186 – 10.0.6.186	10.0.6.186
60	10.0.6.187/32	10.0.6.187 – 10.0.6.187	10.0.6.187
61	10.0.6.188/32	10.0.6.188 – 10.0.6.188	10.0.6.188
62	10.0.6.189/32	10.0.6.189 – 10.0.6.189	10.0.6.189
63	10.0.6.190/32	10.0.6.190 – 10.0.6.190	10.0.6.190
64	10.0.6.191/32	10.0.6.191 – 10.0.6.191	10.0.6.191
65	10.0.6.192/32	10.0.6.192 – 10.0.6.192	10.0.6.192
66	10.0.6.193/32	10.0.6.193 – 10.0.6.193	10.0.6.193
67	10.0.6.194/32	10.0.6.194 – 10.0.6.194	10.0.6.194
68	10.0.6.195/32	10.0.6.195 – 10.0.6.195	10.0.6.195
69	10.0.6.196/32	10.0.6.196 – 10.0.6.196	10.0.6.196
70	10.0.6.197/32	10.0.6.197 – 10.0.6.197	10.0.6.197
71	10.0.6.198/32	10.0.6.198 – 10.0.6.198	10.0.6.198
72	10.0.6.199/32	10.0.6.199 – 10.0.6.199	10.0.6.199
73	10.0.6.200/32	10.0.6.200 – 10.0.6.200	10.0.6.200
74	10.0.6.201/32	10.0.6.201 – 10.0.6.201	10.0.6.201
75	10.0.6.202/32	10.0.6.202 – 10.0.6.202	10.0.6.202
76	10.0.6.203/32	10.0.6.203 – 10.0.6.203	10.0.6.203
77	10.0.6.204/32	10.0.6.204 – 10.0.6.204	10.0.6.204
78	10.0.6.205/32	10.0.6.205 – 10.0.6.205	10.0.6.205
79	10.0.6.206/32	10.0.6.206 – 10.0.6.206	10.0.6.206
80	10.0.6.207/32	10.0.6.207 – 10.0.6.207	10.0.6.207
81	10.0.6.208/32	10.0.6.208 – 10.0.6.208	10.0.6.208
82	10.0.6.209/32	10.0.6.209 – 10.0.6.209	10.0.6.209
83	10.0.6.210/32	10.0.6.210 – 10.0.6.210	10.0.6.210
84	10.0.6.211/32	10.0.6.211 – 10.0.6.211	10.0.6.211
85	10.0.6.212/32	10.0.6.212 – 10.0.6.212	10.0.6.212
86	10.0.6.213/32	10.0.6.213 – 10.0.6.213	10.0.6.213
87	10.0.6.214/32	10.0.6.214 – 10.0.6.214	10.0.6.214
88	10.0.6.215/32	10.0.6.215 – 10.0.6.215	10.0.6.215
89	10.0.6.216/32	10.0.6.216 – 10.0.6.216	10.0.6.216
90	10.0.6.217/32	10.0.6.217 – 10.0.6.217	10.0.6.217
91	10.0.6.218/32	10.0.6.218 – 10.0.6.218	10.0.6.218
92	10.0.6.219/32	10.0.6.219 – 10.0.6.219	10.0.6.219
93	10.0.6.220/32	10.0.6.220 – 10.0.6.220	10.0.6.220
94	10.0.6.221/32	10.0.6.221 – 10.0.6.221	10.0.6.221
95	10.0.6.222/32	10.0.6.222 – 10.0.6.222	10.0.6.222
96	10.0.6.223/32	10.0.6.223 – 10.0.6.223	10.0.6.223
97	10.0.6.224/32	10.0.6.224 – 10.0.6.224	10.0.6.224
98	10.0.6.225/32	10.0.6.225 – 10.0.6.225	10.0.6.225
99	10.0.6.226/32	10.0.6.226 – 10.0.6.226	10.0.6.226
100	10.0.6.227/32	10.0.6.227 – 10.0.6.227	10.0.6.227
101	10.0.6.228/32	10.0.6.228 – 10.0.6.228	10.0.6.228
102	10.0.6.229/32	10.0.6.229 – 10.0.6.229	10.0.6.229
103	10.0.6.230/32	10.0.6.230 – 10.0.6.230	10.0.6.230
104	10.0.6.231/32	10.0.6.231 – 10.0.6.231	10.0.6.231
105	10.0.6.232/32	10.0.6.232 – 10.0.6.232	10.0.6.232
106	10.0.6.233/32	10.0.6.233 – 10.0.6.233	10.0.6.233
107	10.0.6.234/32	10.0.6.234 – 10.0.6.234	10.0.6.234
108	10.0.6.235/32	10.0.6.235 – 10.0.6.235	10.0.6.235
109	10.0.6.236/32	10.0.6.236 – 10.0.6.236	10.0.6.236
110	10.0.6.237/32	10.0.6.237 – 10.0.6.237	10.0.6.237
111	10.0.6.238/32	10.0.6.238 – 10.0.6.238	10.0.6.238
112	10.0.6.239/32	10.0.6.239 – 10.0.6.239	10.0.6.239
113	10.0.6.240/32	10.0.6.240 – 10.0.6.240	10.0.6.240
114	10.0.6.241/32	10.0.6.241 – 10.0.6.241	10.0.6.241
115	10.0.6.242/32	10.0.6.242 – 10.0.6.242	10.0.6.242
116	10.0.6.243/32	10.0.6.243 – 10.0.6.243	10.0.6.243
117	10.0.6.244/32	10.0.6.244 – 10.0.6.244	10.0.6.244
118	10.0.6.245/32	10.0.6.245 – 10.0.6.245	10.0.6.245
119	10.0.6.246/32	10.0.6.246 – 10.0.6.246	10.0.6.246
120	10.0.6.247/32	10.0.6.247 – 10.0.6.247	10.0.6.247
121	10.0.6.248/32	10.0.6.248 – 10.0.6.248	10.0.6.248
122	10.0.6.249/32	10.0.6.249 – 10.0.6.249	10.0.6.249
123	10.0.6.250/32	10.0.6.250 – 10.0.6.250	10.0.6.250
124	10.0.6.251/32	10.0.6.251 – 10.0.6.251	10.0.6.251
125	10.0.6.252/32	10.0.6.252 – 10.0.6.252	10.0.6.252
126	10.0.6.253/32	10.0.6.253 – 10.0.6.253	10.0.6.253
127	10.0.6.254/32	10.0.6.254 – 10.0.6.254	10.0.6.254
128	10.0.6.255/32	10.0.6.255 – 10.0.6.255	10.0.6.255

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 →