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)10.0.5.128/25

network10.0.5.128/25

broadcast10.0.5.255

first host10.0.5.129

last host10.0.5.254

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.0.5.128/25

address00001010.00000000.00000101.10000000

subnet mask11111111.11111111.11111111.10000000

network00001010.00000000.00000101.10000000

broadcast00001010.00000000.00000101.11111111

green = network part, grey = host part

hex0x0a000580

decimal167773568

reverse dns128.5.0.10.in-addr.arpa

ipv4-mapped::ffff:a00:580

/25 split into /32 · 128 subnets

close ×

#	network	host range	broadcast
1	10.0.5.128/32	10.0.5.128 – 10.0.5.128	10.0.5.128
2	10.0.5.129/32	10.0.5.129 – 10.0.5.129	10.0.5.129
3	10.0.5.130/32	10.0.5.130 – 10.0.5.130	10.0.5.130
4	10.0.5.131/32	10.0.5.131 – 10.0.5.131	10.0.5.131
5	10.0.5.132/32	10.0.5.132 – 10.0.5.132	10.0.5.132
6	10.0.5.133/32	10.0.5.133 – 10.0.5.133	10.0.5.133
7	10.0.5.134/32	10.0.5.134 – 10.0.5.134	10.0.5.134
8	10.0.5.135/32	10.0.5.135 – 10.0.5.135	10.0.5.135
9	10.0.5.136/32	10.0.5.136 – 10.0.5.136	10.0.5.136
10	10.0.5.137/32	10.0.5.137 – 10.0.5.137	10.0.5.137
11	10.0.5.138/32	10.0.5.138 – 10.0.5.138	10.0.5.138
12	10.0.5.139/32	10.0.5.139 – 10.0.5.139	10.0.5.139
13	10.0.5.140/32	10.0.5.140 – 10.0.5.140	10.0.5.140
14	10.0.5.141/32	10.0.5.141 – 10.0.5.141	10.0.5.141
15	10.0.5.142/32	10.0.5.142 – 10.0.5.142	10.0.5.142
16	10.0.5.143/32	10.0.5.143 – 10.0.5.143	10.0.5.143
17	10.0.5.144/32	10.0.5.144 – 10.0.5.144	10.0.5.144
18	10.0.5.145/32	10.0.5.145 – 10.0.5.145	10.0.5.145
19	10.0.5.146/32	10.0.5.146 – 10.0.5.146	10.0.5.146
20	10.0.5.147/32	10.0.5.147 – 10.0.5.147	10.0.5.147
21	10.0.5.148/32	10.0.5.148 – 10.0.5.148	10.0.5.148
22	10.0.5.149/32	10.0.5.149 – 10.0.5.149	10.0.5.149
23	10.0.5.150/32	10.0.5.150 – 10.0.5.150	10.0.5.150
24	10.0.5.151/32	10.0.5.151 – 10.0.5.151	10.0.5.151
25	10.0.5.152/32	10.0.5.152 – 10.0.5.152	10.0.5.152
26	10.0.5.153/32	10.0.5.153 – 10.0.5.153	10.0.5.153
27	10.0.5.154/32	10.0.5.154 – 10.0.5.154	10.0.5.154
28	10.0.5.155/32	10.0.5.155 – 10.0.5.155	10.0.5.155
29	10.0.5.156/32	10.0.5.156 – 10.0.5.156	10.0.5.156
30	10.0.5.157/32	10.0.5.157 – 10.0.5.157	10.0.5.157
31	10.0.5.158/32	10.0.5.158 – 10.0.5.158	10.0.5.158
32	10.0.5.159/32	10.0.5.159 – 10.0.5.159	10.0.5.159
33	10.0.5.160/32	10.0.5.160 – 10.0.5.160	10.0.5.160
34	10.0.5.161/32	10.0.5.161 – 10.0.5.161	10.0.5.161
35	10.0.5.162/32	10.0.5.162 – 10.0.5.162	10.0.5.162
36	10.0.5.163/32	10.0.5.163 – 10.0.5.163	10.0.5.163
37	10.0.5.164/32	10.0.5.164 – 10.0.5.164	10.0.5.164
38	10.0.5.165/32	10.0.5.165 – 10.0.5.165	10.0.5.165
39	10.0.5.166/32	10.0.5.166 – 10.0.5.166	10.0.5.166
40	10.0.5.167/32	10.0.5.167 – 10.0.5.167	10.0.5.167
41	10.0.5.168/32	10.0.5.168 – 10.0.5.168	10.0.5.168
42	10.0.5.169/32	10.0.5.169 – 10.0.5.169	10.0.5.169
43	10.0.5.170/32	10.0.5.170 – 10.0.5.170	10.0.5.170
44	10.0.5.171/32	10.0.5.171 – 10.0.5.171	10.0.5.171
45	10.0.5.172/32	10.0.5.172 – 10.0.5.172	10.0.5.172
46	10.0.5.173/32	10.0.5.173 – 10.0.5.173	10.0.5.173
47	10.0.5.174/32	10.0.5.174 – 10.0.5.174	10.0.5.174
48	10.0.5.175/32	10.0.5.175 – 10.0.5.175	10.0.5.175
49	10.0.5.176/32	10.0.5.176 – 10.0.5.176	10.0.5.176
50	10.0.5.177/32	10.0.5.177 – 10.0.5.177	10.0.5.177
51	10.0.5.178/32	10.0.5.178 – 10.0.5.178	10.0.5.178
52	10.0.5.179/32	10.0.5.179 – 10.0.5.179	10.0.5.179
53	10.0.5.180/32	10.0.5.180 – 10.0.5.180	10.0.5.180
54	10.0.5.181/32	10.0.5.181 – 10.0.5.181	10.0.5.181
55	10.0.5.182/32	10.0.5.182 – 10.0.5.182	10.0.5.182
56	10.0.5.183/32	10.0.5.183 – 10.0.5.183	10.0.5.183
57	10.0.5.184/32	10.0.5.184 – 10.0.5.184	10.0.5.184
58	10.0.5.185/32	10.0.5.185 – 10.0.5.185	10.0.5.185
59	10.0.5.186/32	10.0.5.186 – 10.0.5.186	10.0.5.186
60	10.0.5.187/32	10.0.5.187 – 10.0.5.187	10.0.5.187
61	10.0.5.188/32	10.0.5.188 – 10.0.5.188	10.0.5.188
62	10.0.5.189/32	10.0.5.189 – 10.0.5.189	10.0.5.189
63	10.0.5.190/32	10.0.5.190 – 10.0.5.190	10.0.5.190
64	10.0.5.191/32	10.0.5.191 – 10.0.5.191	10.0.5.191
65	10.0.5.192/32	10.0.5.192 – 10.0.5.192	10.0.5.192
66	10.0.5.193/32	10.0.5.193 – 10.0.5.193	10.0.5.193
67	10.0.5.194/32	10.0.5.194 – 10.0.5.194	10.0.5.194
68	10.0.5.195/32	10.0.5.195 – 10.0.5.195	10.0.5.195
69	10.0.5.196/32	10.0.5.196 – 10.0.5.196	10.0.5.196
70	10.0.5.197/32	10.0.5.197 – 10.0.5.197	10.0.5.197
71	10.0.5.198/32	10.0.5.198 – 10.0.5.198	10.0.5.198
72	10.0.5.199/32	10.0.5.199 – 10.0.5.199	10.0.5.199
73	10.0.5.200/32	10.0.5.200 – 10.0.5.200	10.0.5.200
74	10.0.5.201/32	10.0.5.201 – 10.0.5.201	10.0.5.201
75	10.0.5.202/32	10.0.5.202 – 10.0.5.202	10.0.5.202
76	10.0.5.203/32	10.0.5.203 – 10.0.5.203	10.0.5.203
77	10.0.5.204/32	10.0.5.204 – 10.0.5.204	10.0.5.204
78	10.0.5.205/32	10.0.5.205 – 10.0.5.205	10.0.5.205
79	10.0.5.206/32	10.0.5.206 – 10.0.5.206	10.0.5.206
80	10.0.5.207/32	10.0.5.207 – 10.0.5.207	10.0.5.207
81	10.0.5.208/32	10.0.5.208 – 10.0.5.208	10.0.5.208
82	10.0.5.209/32	10.0.5.209 – 10.0.5.209	10.0.5.209
83	10.0.5.210/32	10.0.5.210 – 10.0.5.210	10.0.5.210
84	10.0.5.211/32	10.0.5.211 – 10.0.5.211	10.0.5.211
85	10.0.5.212/32	10.0.5.212 – 10.0.5.212	10.0.5.212
86	10.0.5.213/32	10.0.5.213 – 10.0.5.213	10.0.5.213
87	10.0.5.214/32	10.0.5.214 – 10.0.5.214	10.0.5.214
88	10.0.5.215/32	10.0.5.215 – 10.0.5.215	10.0.5.215
89	10.0.5.216/32	10.0.5.216 – 10.0.5.216	10.0.5.216
90	10.0.5.217/32	10.0.5.217 – 10.0.5.217	10.0.5.217
91	10.0.5.218/32	10.0.5.218 – 10.0.5.218	10.0.5.218
92	10.0.5.219/32	10.0.5.219 – 10.0.5.219	10.0.5.219
93	10.0.5.220/32	10.0.5.220 – 10.0.5.220	10.0.5.220
94	10.0.5.221/32	10.0.5.221 – 10.0.5.221	10.0.5.221
95	10.0.5.222/32	10.0.5.222 – 10.0.5.222	10.0.5.222
96	10.0.5.223/32	10.0.5.223 – 10.0.5.223	10.0.5.223
97	10.0.5.224/32	10.0.5.224 – 10.0.5.224	10.0.5.224
98	10.0.5.225/32	10.0.5.225 – 10.0.5.225	10.0.5.225
99	10.0.5.226/32	10.0.5.226 – 10.0.5.226	10.0.5.226
100	10.0.5.227/32	10.0.5.227 – 10.0.5.227	10.0.5.227
101	10.0.5.228/32	10.0.5.228 – 10.0.5.228	10.0.5.228
102	10.0.5.229/32	10.0.5.229 – 10.0.5.229	10.0.5.229
103	10.0.5.230/32	10.0.5.230 – 10.0.5.230	10.0.5.230
104	10.0.5.231/32	10.0.5.231 – 10.0.5.231	10.0.5.231
105	10.0.5.232/32	10.0.5.232 – 10.0.5.232	10.0.5.232
106	10.0.5.233/32	10.0.5.233 – 10.0.5.233	10.0.5.233
107	10.0.5.234/32	10.0.5.234 – 10.0.5.234	10.0.5.234
108	10.0.5.235/32	10.0.5.235 – 10.0.5.235	10.0.5.235
109	10.0.5.236/32	10.0.5.236 – 10.0.5.236	10.0.5.236
110	10.0.5.237/32	10.0.5.237 – 10.0.5.237	10.0.5.237
111	10.0.5.238/32	10.0.5.238 – 10.0.5.238	10.0.5.238
112	10.0.5.239/32	10.0.5.239 – 10.0.5.239	10.0.5.239
113	10.0.5.240/32	10.0.5.240 – 10.0.5.240	10.0.5.240
114	10.0.5.241/32	10.0.5.241 – 10.0.5.241	10.0.5.241
115	10.0.5.242/32	10.0.5.242 – 10.0.5.242	10.0.5.242
116	10.0.5.243/32	10.0.5.243 – 10.0.5.243	10.0.5.243
117	10.0.5.244/32	10.0.5.244 – 10.0.5.244	10.0.5.244
118	10.0.5.245/32	10.0.5.245 – 10.0.5.245	10.0.5.245
119	10.0.5.246/32	10.0.5.246 – 10.0.5.246	10.0.5.246
120	10.0.5.247/32	10.0.5.247 – 10.0.5.247	10.0.5.247
121	10.0.5.248/32	10.0.5.248 – 10.0.5.248	10.0.5.248
122	10.0.5.249/32	10.0.5.249 – 10.0.5.249	10.0.5.249
123	10.0.5.250/32	10.0.5.250 – 10.0.5.250	10.0.5.250
124	10.0.5.251/32	10.0.5.251 – 10.0.5.251	10.0.5.251
125	10.0.5.252/32	10.0.5.252 – 10.0.5.252	10.0.5.252
126	10.0.5.253/32	10.0.5.253 – 10.0.5.253	10.0.5.253
127	10.0.5.254/32	10.0.5.254 – 10.0.5.254	10.0.5.254
128	10.0.5.255/32	10.0.5.255 – 10.0.5.255	10.0.5.255

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 →