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)10.0.58.128/25

network10.0.58.128/25

broadcast10.0.58.255

first host10.0.58.129

last host10.0.58.254

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.0.58.128/25

address00001010.00000000.00111010.10000000

subnet mask11111111.11111111.11111111.10000000

network00001010.00000000.00111010.10000000

broadcast00001010.00000000.00111010.11111111

green = network part, grey = host part

hex0x0a003a80

decimal167787136

reverse dns128.58.0.10.in-addr.arpa

ipv4-mapped::ffff:a00:3a80

/25 split into /32 · 128 subnets

close ×

#	network	host range	broadcast
1	10.0.58.128/32	10.0.58.128 – 10.0.58.128	10.0.58.128
2	10.0.58.129/32	10.0.58.129 – 10.0.58.129	10.0.58.129
3	10.0.58.130/32	10.0.58.130 – 10.0.58.130	10.0.58.130
4	10.0.58.131/32	10.0.58.131 – 10.0.58.131	10.0.58.131
5	10.0.58.132/32	10.0.58.132 – 10.0.58.132	10.0.58.132
6	10.0.58.133/32	10.0.58.133 – 10.0.58.133	10.0.58.133
7	10.0.58.134/32	10.0.58.134 – 10.0.58.134	10.0.58.134
8	10.0.58.135/32	10.0.58.135 – 10.0.58.135	10.0.58.135
9	10.0.58.136/32	10.0.58.136 – 10.0.58.136	10.0.58.136
10	10.0.58.137/32	10.0.58.137 – 10.0.58.137	10.0.58.137
11	10.0.58.138/32	10.0.58.138 – 10.0.58.138	10.0.58.138
12	10.0.58.139/32	10.0.58.139 – 10.0.58.139	10.0.58.139
13	10.0.58.140/32	10.0.58.140 – 10.0.58.140	10.0.58.140
14	10.0.58.141/32	10.0.58.141 – 10.0.58.141	10.0.58.141
15	10.0.58.142/32	10.0.58.142 – 10.0.58.142	10.0.58.142
16	10.0.58.143/32	10.0.58.143 – 10.0.58.143	10.0.58.143
17	10.0.58.144/32	10.0.58.144 – 10.0.58.144	10.0.58.144
18	10.0.58.145/32	10.0.58.145 – 10.0.58.145	10.0.58.145
19	10.0.58.146/32	10.0.58.146 – 10.0.58.146	10.0.58.146
20	10.0.58.147/32	10.0.58.147 – 10.0.58.147	10.0.58.147
21	10.0.58.148/32	10.0.58.148 – 10.0.58.148	10.0.58.148
22	10.0.58.149/32	10.0.58.149 – 10.0.58.149	10.0.58.149
23	10.0.58.150/32	10.0.58.150 – 10.0.58.150	10.0.58.150
24	10.0.58.151/32	10.0.58.151 – 10.0.58.151	10.0.58.151
25	10.0.58.152/32	10.0.58.152 – 10.0.58.152	10.0.58.152
26	10.0.58.153/32	10.0.58.153 – 10.0.58.153	10.0.58.153
27	10.0.58.154/32	10.0.58.154 – 10.0.58.154	10.0.58.154
28	10.0.58.155/32	10.0.58.155 – 10.0.58.155	10.0.58.155
29	10.0.58.156/32	10.0.58.156 – 10.0.58.156	10.0.58.156
30	10.0.58.157/32	10.0.58.157 – 10.0.58.157	10.0.58.157
31	10.0.58.158/32	10.0.58.158 – 10.0.58.158	10.0.58.158
32	10.0.58.159/32	10.0.58.159 – 10.0.58.159	10.0.58.159
33	10.0.58.160/32	10.0.58.160 – 10.0.58.160	10.0.58.160
34	10.0.58.161/32	10.0.58.161 – 10.0.58.161	10.0.58.161
35	10.0.58.162/32	10.0.58.162 – 10.0.58.162	10.0.58.162
36	10.0.58.163/32	10.0.58.163 – 10.0.58.163	10.0.58.163
37	10.0.58.164/32	10.0.58.164 – 10.0.58.164	10.0.58.164
38	10.0.58.165/32	10.0.58.165 – 10.0.58.165	10.0.58.165
39	10.0.58.166/32	10.0.58.166 – 10.0.58.166	10.0.58.166
40	10.0.58.167/32	10.0.58.167 – 10.0.58.167	10.0.58.167
41	10.0.58.168/32	10.0.58.168 – 10.0.58.168	10.0.58.168
42	10.0.58.169/32	10.0.58.169 – 10.0.58.169	10.0.58.169
43	10.0.58.170/32	10.0.58.170 – 10.0.58.170	10.0.58.170
44	10.0.58.171/32	10.0.58.171 – 10.0.58.171	10.0.58.171
45	10.0.58.172/32	10.0.58.172 – 10.0.58.172	10.0.58.172
46	10.0.58.173/32	10.0.58.173 – 10.0.58.173	10.0.58.173
47	10.0.58.174/32	10.0.58.174 – 10.0.58.174	10.0.58.174
48	10.0.58.175/32	10.0.58.175 – 10.0.58.175	10.0.58.175
49	10.0.58.176/32	10.0.58.176 – 10.0.58.176	10.0.58.176
50	10.0.58.177/32	10.0.58.177 – 10.0.58.177	10.0.58.177
51	10.0.58.178/32	10.0.58.178 – 10.0.58.178	10.0.58.178
52	10.0.58.179/32	10.0.58.179 – 10.0.58.179	10.0.58.179
53	10.0.58.180/32	10.0.58.180 – 10.0.58.180	10.0.58.180
54	10.0.58.181/32	10.0.58.181 – 10.0.58.181	10.0.58.181
55	10.0.58.182/32	10.0.58.182 – 10.0.58.182	10.0.58.182
56	10.0.58.183/32	10.0.58.183 – 10.0.58.183	10.0.58.183
57	10.0.58.184/32	10.0.58.184 – 10.0.58.184	10.0.58.184
58	10.0.58.185/32	10.0.58.185 – 10.0.58.185	10.0.58.185
59	10.0.58.186/32	10.0.58.186 – 10.0.58.186	10.0.58.186
60	10.0.58.187/32	10.0.58.187 – 10.0.58.187	10.0.58.187
61	10.0.58.188/32	10.0.58.188 – 10.0.58.188	10.0.58.188
62	10.0.58.189/32	10.0.58.189 – 10.0.58.189	10.0.58.189
63	10.0.58.190/32	10.0.58.190 – 10.0.58.190	10.0.58.190
64	10.0.58.191/32	10.0.58.191 – 10.0.58.191	10.0.58.191
65	10.0.58.192/32	10.0.58.192 – 10.0.58.192	10.0.58.192
66	10.0.58.193/32	10.0.58.193 – 10.0.58.193	10.0.58.193
67	10.0.58.194/32	10.0.58.194 – 10.0.58.194	10.0.58.194
68	10.0.58.195/32	10.0.58.195 – 10.0.58.195	10.0.58.195
69	10.0.58.196/32	10.0.58.196 – 10.0.58.196	10.0.58.196
70	10.0.58.197/32	10.0.58.197 – 10.0.58.197	10.0.58.197
71	10.0.58.198/32	10.0.58.198 – 10.0.58.198	10.0.58.198
72	10.0.58.199/32	10.0.58.199 – 10.0.58.199	10.0.58.199
73	10.0.58.200/32	10.0.58.200 – 10.0.58.200	10.0.58.200
74	10.0.58.201/32	10.0.58.201 – 10.0.58.201	10.0.58.201
75	10.0.58.202/32	10.0.58.202 – 10.0.58.202	10.0.58.202
76	10.0.58.203/32	10.0.58.203 – 10.0.58.203	10.0.58.203
77	10.0.58.204/32	10.0.58.204 – 10.0.58.204	10.0.58.204
78	10.0.58.205/32	10.0.58.205 – 10.0.58.205	10.0.58.205
79	10.0.58.206/32	10.0.58.206 – 10.0.58.206	10.0.58.206
80	10.0.58.207/32	10.0.58.207 – 10.0.58.207	10.0.58.207
81	10.0.58.208/32	10.0.58.208 – 10.0.58.208	10.0.58.208
82	10.0.58.209/32	10.0.58.209 – 10.0.58.209	10.0.58.209
83	10.0.58.210/32	10.0.58.210 – 10.0.58.210	10.0.58.210
84	10.0.58.211/32	10.0.58.211 – 10.0.58.211	10.0.58.211
85	10.0.58.212/32	10.0.58.212 – 10.0.58.212	10.0.58.212
86	10.0.58.213/32	10.0.58.213 – 10.0.58.213	10.0.58.213
87	10.0.58.214/32	10.0.58.214 – 10.0.58.214	10.0.58.214
88	10.0.58.215/32	10.0.58.215 – 10.0.58.215	10.0.58.215
89	10.0.58.216/32	10.0.58.216 – 10.0.58.216	10.0.58.216
90	10.0.58.217/32	10.0.58.217 – 10.0.58.217	10.0.58.217
91	10.0.58.218/32	10.0.58.218 – 10.0.58.218	10.0.58.218
92	10.0.58.219/32	10.0.58.219 – 10.0.58.219	10.0.58.219
93	10.0.58.220/32	10.0.58.220 – 10.0.58.220	10.0.58.220
94	10.0.58.221/32	10.0.58.221 – 10.0.58.221	10.0.58.221
95	10.0.58.222/32	10.0.58.222 – 10.0.58.222	10.0.58.222
96	10.0.58.223/32	10.0.58.223 – 10.0.58.223	10.0.58.223
97	10.0.58.224/32	10.0.58.224 – 10.0.58.224	10.0.58.224
98	10.0.58.225/32	10.0.58.225 – 10.0.58.225	10.0.58.225
99	10.0.58.226/32	10.0.58.226 – 10.0.58.226	10.0.58.226
100	10.0.58.227/32	10.0.58.227 – 10.0.58.227	10.0.58.227
101	10.0.58.228/32	10.0.58.228 – 10.0.58.228	10.0.58.228
102	10.0.58.229/32	10.0.58.229 – 10.0.58.229	10.0.58.229
103	10.0.58.230/32	10.0.58.230 – 10.0.58.230	10.0.58.230
104	10.0.58.231/32	10.0.58.231 – 10.0.58.231	10.0.58.231
105	10.0.58.232/32	10.0.58.232 – 10.0.58.232	10.0.58.232
106	10.0.58.233/32	10.0.58.233 – 10.0.58.233	10.0.58.233
107	10.0.58.234/32	10.0.58.234 – 10.0.58.234	10.0.58.234
108	10.0.58.235/32	10.0.58.235 – 10.0.58.235	10.0.58.235
109	10.0.58.236/32	10.0.58.236 – 10.0.58.236	10.0.58.236
110	10.0.58.237/32	10.0.58.237 – 10.0.58.237	10.0.58.237
111	10.0.58.238/32	10.0.58.238 – 10.0.58.238	10.0.58.238
112	10.0.58.239/32	10.0.58.239 – 10.0.58.239	10.0.58.239
113	10.0.58.240/32	10.0.58.240 – 10.0.58.240	10.0.58.240
114	10.0.58.241/32	10.0.58.241 – 10.0.58.241	10.0.58.241
115	10.0.58.242/32	10.0.58.242 – 10.0.58.242	10.0.58.242
116	10.0.58.243/32	10.0.58.243 – 10.0.58.243	10.0.58.243
117	10.0.58.244/32	10.0.58.244 – 10.0.58.244	10.0.58.244
118	10.0.58.245/32	10.0.58.245 – 10.0.58.245	10.0.58.245
119	10.0.58.246/32	10.0.58.246 – 10.0.58.246	10.0.58.246
120	10.0.58.247/32	10.0.58.247 – 10.0.58.247	10.0.58.247
121	10.0.58.248/32	10.0.58.248 – 10.0.58.248	10.0.58.248
122	10.0.58.249/32	10.0.58.249 – 10.0.58.249	10.0.58.249
123	10.0.58.250/32	10.0.58.250 – 10.0.58.250	10.0.58.250
124	10.0.58.251/32	10.0.58.251 – 10.0.58.251	10.0.58.251
125	10.0.58.252/32	10.0.58.252 – 10.0.58.252	10.0.58.252
126	10.0.58.253/32	10.0.58.253 – 10.0.58.253	10.0.58.253
127	10.0.58.254/32	10.0.58.254 – 10.0.58.254	10.0.58.254
128	10.0.58.255/32	10.0.58.255 – 10.0.58.255	10.0.58.255

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 →