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)10.0.24.128/25

network10.0.24.128/25

broadcast10.0.24.255

first host10.0.24.129

last host10.0.24.254

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.0.24.128/25

address00001010.00000000.00011000.10000000

subnet mask11111111.11111111.11111111.10000000

network00001010.00000000.00011000.10000000

broadcast00001010.00000000.00011000.11111111

green = network part, grey = host part

hex0x0a001880

decimal167778432

reverse dns128.24.0.10.in-addr.arpa

ipv4-mapped::ffff:a00:1880

/25 split into /32 · 128 subnets

close ×

#	network	host range	broadcast
1	10.0.24.128/32	10.0.24.128 – 10.0.24.128	10.0.24.128
2	10.0.24.129/32	10.0.24.129 – 10.0.24.129	10.0.24.129
3	10.0.24.130/32	10.0.24.130 – 10.0.24.130	10.0.24.130
4	10.0.24.131/32	10.0.24.131 – 10.0.24.131	10.0.24.131
5	10.0.24.132/32	10.0.24.132 – 10.0.24.132	10.0.24.132
6	10.0.24.133/32	10.0.24.133 – 10.0.24.133	10.0.24.133
7	10.0.24.134/32	10.0.24.134 – 10.0.24.134	10.0.24.134
8	10.0.24.135/32	10.0.24.135 – 10.0.24.135	10.0.24.135
9	10.0.24.136/32	10.0.24.136 – 10.0.24.136	10.0.24.136
10	10.0.24.137/32	10.0.24.137 – 10.0.24.137	10.0.24.137
11	10.0.24.138/32	10.0.24.138 – 10.0.24.138	10.0.24.138
12	10.0.24.139/32	10.0.24.139 – 10.0.24.139	10.0.24.139
13	10.0.24.140/32	10.0.24.140 – 10.0.24.140	10.0.24.140
14	10.0.24.141/32	10.0.24.141 – 10.0.24.141	10.0.24.141
15	10.0.24.142/32	10.0.24.142 – 10.0.24.142	10.0.24.142
16	10.0.24.143/32	10.0.24.143 – 10.0.24.143	10.0.24.143
17	10.0.24.144/32	10.0.24.144 – 10.0.24.144	10.0.24.144
18	10.0.24.145/32	10.0.24.145 – 10.0.24.145	10.0.24.145
19	10.0.24.146/32	10.0.24.146 – 10.0.24.146	10.0.24.146
20	10.0.24.147/32	10.0.24.147 – 10.0.24.147	10.0.24.147
21	10.0.24.148/32	10.0.24.148 – 10.0.24.148	10.0.24.148
22	10.0.24.149/32	10.0.24.149 – 10.0.24.149	10.0.24.149
23	10.0.24.150/32	10.0.24.150 – 10.0.24.150	10.0.24.150
24	10.0.24.151/32	10.0.24.151 – 10.0.24.151	10.0.24.151
25	10.0.24.152/32	10.0.24.152 – 10.0.24.152	10.0.24.152
26	10.0.24.153/32	10.0.24.153 – 10.0.24.153	10.0.24.153
27	10.0.24.154/32	10.0.24.154 – 10.0.24.154	10.0.24.154
28	10.0.24.155/32	10.0.24.155 – 10.0.24.155	10.0.24.155
29	10.0.24.156/32	10.0.24.156 – 10.0.24.156	10.0.24.156
30	10.0.24.157/32	10.0.24.157 – 10.0.24.157	10.0.24.157
31	10.0.24.158/32	10.0.24.158 – 10.0.24.158	10.0.24.158
32	10.0.24.159/32	10.0.24.159 – 10.0.24.159	10.0.24.159
33	10.0.24.160/32	10.0.24.160 – 10.0.24.160	10.0.24.160
34	10.0.24.161/32	10.0.24.161 – 10.0.24.161	10.0.24.161
35	10.0.24.162/32	10.0.24.162 – 10.0.24.162	10.0.24.162
36	10.0.24.163/32	10.0.24.163 – 10.0.24.163	10.0.24.163
37	10.0.24.164/32	10.0.24.164 – 10.0.24.164	10.0.24.164
38	10.0.24.165/32	10.0.24.165 – 10.0.24.165	10.0.24.165
39	10.0.24.166/32	10.0.24.166 – 10.0.24.166	10.0.24.166
40	10.0.24.167/32	10.0.24.167 – 10.0.24.167	10.0.24.167
41	10.0.24.168/32	10.0.24.168 – 10.0.24.168	10.0.24.168
42	10.0.24.169/32	10.0.24.169 – 10.0.24.169	10.0.24.169
43	10.0.24.170/32	10.0.24.170 – 10.0.24.170	10.0.24.170
44	10.0.24.171/32	10.0.24.171 – 10.0.24.171	10.0.24.171
45	10.0.24.172/32	10.0.24.172 – 10.0.24.172	10.0.24.172
46	10.0.24.173/32	10.0.24.173 – 10.0.24.173	10.0.24.173
47	10.0.24.174/32	10.0.24.174 – 10.0.24.174	10.0.24.174
48	10.0.24.175/32	10.0.24.175 – 10.0.24.175	10.0.24.175
49	10.0.24.176/32	10.0.24.176 – 10.0.24.176	10.0.24.176
50	10.0.24.177/32	10.0.24.177 – 10.0.24.177	10.0.24.177
51	10.0.24.178/32	10.0.24.178 – 10.0.24.178	10.0.24.178
52	10.0.24.179/32	10.0.24.179 – 10.0.24.179	10.0.24.179
53	10.0.24.180/32	10.0.24.180 – 10.0.24.180	10.0.24.180
54	10.0.24.181/32	10.0.24.181 – 10.0.24.181	10.0.24.181
55	10.0.24.182/32	10.0.24.182 – 10.0.24.182	10.0.24.182
56	10.0.24.183/32	10.0.24.183 – 10.0.24.183	10.0.24.183
57	10.0.24.184/32	10.0.24.184 – 10.0.24.184	10.0.24.184
58	10.0.24.185/32	10.0.24.185 – 10.0.24.185	10.0.24.185
59	10.0.24.186/32	10.0.24.186 – 10.0.24.186	10.0.24.186
60	10.0.24.187/32	10.0.24.187 – 10.0.24.187	10.0.24.187
61	10.0.24.188/32	10.0.24.188 – 10.0.24.188	10.0.24.188
62	10.0.24.189/32	10.0.24.189 – 10.0.24.189	10.0.24.189
63	10.0.24.190/32	10.0.24.190 – 10.0.24.190	10.0.24.190
64	10.0.24.191/32	10.0.24.191 – 10.0.24.191	10.0.24.191
65	10.0.24.192/32	10.0.24.192 – 10.0.24.192	10.0.24.192
66	10.0.24.193/32	10.0.24.193 – 10.0.24.193	10.0.24.193
67	10.0.24.194/32	10.0.24.194 – 10.0.24.194	10.0.24.194
68	10.0.24.195/32	10.0.24.195 – 10.0.24.195	10.0.24.195
69	10.0.24.196/32	10.0.24.196 – 10.0.24.196	10.0.24.196
70	10.0.24.197/32	10.0.24.197 – 10.0.24.197	10.0.24.197
71	10.0.24.198/32	10.0.24.198 – 10.0.24.198	10.0.24.198
72	10.0.24.199/32	10.0.24.199 – 10.0.24.199	10.0.24.199
73	10.0.24.200/32	10.0.24.200 – 10.0.24.200	10.0.24.200
74	10.0.24.201/32	10.0.24.201 – 10.0.24.201	10.0.24.201
75	10.0.24.202/32	10.0.24.202 – 10.0.24.202	10.0.24.202
76	10.0.24.203/32	10.0.24.203 – 10.0.24.203	10.0.24.203
77	10.0.24.204/32	10.0.24.204 – 10.0.24.204	10.0.24.204
78	10.0.24.205/32	10.0.24.205 – 10.0.24.205	10.0.24.205
79	10.0.24.206/32	10.0.24.206 – 10.0.24.206	10.0.24.206
80	10.0.24.207/32	10.0.24.207 – 10.0.24.207	10.0.24.207
81	10.0.24.208/32	10.0.24.208 – 10.0.24.208	10.0.24.208
82	10.0.24.209/32	10.0.24.209 – 10.0.24.209	10.0.24.209
83	10.0.24.210/32	10.0.24.210 – 10.0.24.210	10.0.24.210
84	10.0.24.211/32	10.0.24.211 – 10.0.24.211	10.0.24.211
85	10.0.24.212/32	10.0.24.212 – 10.0.24.212	10.0.24.212
86	10.0.24.213/32	10.0.24.213 – 10.0.24.213	10.0.24.213
87	10.0.24.214/32	10.0.24.214 – 10.0.24.214	10.0.24.214
88	10.0.24.215/32	10.0.24.215 – 10.0.24.215	10.0.24.215
89	10.0.24.216/32	10.0.24.216 – 10.0.24.216	10.0.24.216
90	10.0.24.217/32	10.0.24.217 – 10.0.24.217	10.0.24.217
91	10.0.24.218/32	10.0.24.218 – 10.0.24.218	10.0.24.218
92	10.0.24.219/32	10.0.24.219 – 10.0.24.219	10.0.24.219
93	10.0.24.220/32	10.0.24.220 – 10.0.24.220	10.0.24.220
94	10.0.24.221/32	10.0.24.221 – 10.0.24.221	10.0.24.221
95	10.0.24.222/32	10.0.24.222 – 10.0.24.222	10.0.24.222
96	10.0.24.223/32	10.0.24.223 – 10.0.24.223	10.0.24.223
97	10.0.24.224/32	10.0.24.224 – 10.0.24.224	10.0.24.224
98	10.0.24.225/32	10.0.24.225 – 10.0.24.225	10.0.24.225
99	10.0.24.226/32	10.0.24.226 – 10.0.24.226	10.0.24.226
100	10.0.24.227/32	10.0.24.227 – 10.0.24.227	10.0.24.227
101	10.0.24.228/32	10.0.24.228 – 10.0.24.228	10.0.24.228
102	10.0.24.229/32	10.0.24.229 – 10.0.24.229	10.0.24.229
103	10.0.24.230/32	10.0.24.230 – 10.0.24.230	10.0.24.230
104	10.0.24.231/32	10.0.24.231 – 10.0.24.231	10.0.24.231
105	10.0.24.232/32	10.0.24.232 – 10.0.24.232	10.0.24.232
106	10.0.24.233/32	10.0.24.233 – 10.0.24.233	10.0.24.233
107	10.0.24.234/32	10.0.24.234 – 10.0.24.234	10.0.24.234
108	10.0.24.235/32	10.0.24.235 – 10.0.24.235	10.0.24.235
109	10.0.24.236/32	10.0.24.236 – 10.0.24.236	10.0.24.236
110	10.0.24.237/32	10.0.24.237 – 10.0.24.237	10.0.24.237
111	10.0.24.238/32	10.0.24.238 – 10.0.24.238	10.0.24.238
112	10.0.24.239/32	10.0.24.239 – 10.0.24.239	10.0.24.239
113	10.0.24.240/32	10.0.24.240 – 10.0.24.240	10.0.24.240
114	10.0.24.241/32	10.0.24.241 – 10.0.24.241	10.0.24.241
115	10.0.24.242/32	10.0.24.242 – 10.0.24.242	10.0.24.242
116	10.0.24.243/32	10.0.24.243 – 10.0.24.243	10.0.24.243
117	10.0.24.244/32	10.0.24.244 – 10.0.24.244	10.0.24.244
118	10.0.24.245/32	10.0.24.245 – 10.0.24.245	10.0.24.245
119	10.0.24.246/32	10.0.24.246 – 10.0.24.246	10.0.24.246
120	10.0.24.247/32	10.0.24.247 – 10.0.24.247	10.0.24.247
121	10.0.24.248/32	10.0.24.248 – 10.0.24.248	10.0.24.248
122	10.0.24.249/32	10.0.24.249 – 10.0.24.249	10.0.24.249
123	10.0.24.250/32	10.0.24.250 – 10.0.24.250	10.0.24.250
124	10.0.24.251/32	10.0.24.251 – 10.0.24.251	10.0.24.251
125	10.0.24.252/32	10.0.24.252 – 10.0.24.252	10.0.24.252
126	10.0.24.253/32	10.0.24.253 – 10.0.24.253	10.0.24.253
127	10.0.24.254/32	10.0.24.254 – 10.0.24.254	10.0.24.254
128	10.0.24.255/32	10.0.24.255 – 10.0.24.255	10.0.24.255

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 →