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)10.2.75.128/25

network10.2.75.128/25

broadcast10.2.75.255

first host10.2.75.129

last host10.2.75.254

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.2.75.128/25

address00001010.00000010.01001011.10000000

subnet mask11111111.11111111.11111111.10000000

network00001010.00000010.01001011.10000000

broadcast00001010.00000010.01001011.11111111

green = network part, grey = host part

hex0x0a024b80

decimal167922560

reverse dns128.75.2.10.in-addr.arpa

ipv4-mapped::ffff:a02:4b80

/25 split into /32 · 128 subnets

close ×

#	network	host range	broadcast
1	10.2.75.128/32	10.2.75.128 – 10.2.75.128	10.2.75.128
2	10.2.75.129/32	10.2.75.129 – 10.2.75.129	10.2.75.129
3	10.2.75.130/32	10.2.75.130 – 10.2.75.130	10.2.75.130
4	10.2.75.131/32	10.2.75.131 – 10.2.75.131	10.2.75.131
5	10.2.75.132/32	10.2.75.132 – 10.2.75.132	10.2.75.132
6	10.2.75.133/32	10.2.75.133 – 10.2.75.133	10.2.75.133
7	10.2.75.134/32	10.2.75.134 – 10.2.75.134	10.2.75.134
8	10.2.75.135/32	10.2.75.135 – 10.2.75.135	10.2.75.135
9	10.2.75.136/32	10.2.75.136 – 10.2.75.136	10.2.75.136
10	10.2.75.137/32	10.2.75.137 – 10.2.75.137	10.2.75.137
11	10.2.75.138/32	10.2.75.138 – 10.2.75.138	10.2.75.138
12	10.2.75.139/32	10.2.75.139 – 10.2.75.139	10.2.75.139
13	10.2.75.140/32	10.2.75.140 – 10.2.75.140	10.2.75.140
14	10.2.75.141/32	10.2.75.141 – 10.2.75.141	10.2.75.141
15	10.2.75.142/32	10.2.75.142 – 10.2.75.142	10.2.75.142
16	10.2.75.143/32	10.2.75.143 – 10.2.75.143	10.2.75.143
17	10.2.75.144/32	10.2.75.144 – 10.2.75.144	10.2.75.144
18	10.2.75.145/32	10.2.75.145 – 10.2.75.145	10.2.75.145
19	10.2.75.146/32	10.2.75.146 – 10.2.75.146	10.2.75.146
20	10.2.75.147/32	10.2.75.147 – 10.2.75.147	10.2.75.147
21	10.2.75.148/32	10.2.75.148 – 10.2.75.148	10.2.75.148
22	10.2.75.149/32	10.2.75.149 – 10.2.75.149	10.2.75.149
23	10.2.75.150/32	10.2.75.150 – 10.2.75.150	10.2.75.150
24	10.2.75.151/32	10.2.75.151 – 10.2.75.151	10.2.75.151
25	10.2.75.152/32	10.2.75.152 – 10.2.75.152	10.2.75.152
26	10.2.75.153/32	10.2.75.153 – 10.2.75.153	10.2.75.153
27	10.2.75.154/32	10.2.75.154 – 10.2.75.154	10.2.75.154
28	10.2.75.155/32	10.2.75.155 – 10.2.75.155	10.2.75.155
29	10.2.75.156/32	10.2.75.156 – 10.2.75.156	10.2.75.156
30	10.2.75.157/32	10.2.75.157 – 10.2.75.157	10.2.75.157
31	10.2.75.158/32	10.2.75.158 – 10.2.75.158	10.2.75.158
32	10.2.75.159/32	10.2.75.159 – 10.2.75.159	10.2.75.159
33	10.2.75.160/32	10.2.75.160 – 10.2.75.160	10.2.75.160
34	10.2.75.161/32	10.2.75.161 – 10.2.75.161	10.2.75.161
35	10.2.75.162/32	10.2.75.162 – 10.2.75.162	10.2.75.162
36	10.2.75.163/32	10.2.75.163 – 10.2.75.163	10.2.75.163
37	10.2.75.164/32	10.2.75.164 – 10.2.75.164	10.2.75.164
38	10.2.75.165/32	10.2.75.165 – 10.2.75.165	10.2.75.165
39	10.2.75.166/32	10.2.75.166 – 10.2.75.166	10.2.75.166
40	10.2.75.167/32	10.2.75.167 – 10.2.75.167	10.2.75.167
41	10.2.75.168/32	10.2.75.168 – 10.2.75.168	10.2.75.168
42	10.2.75.169/32	10.2.75.169 – 10.2.75.169	10.2.75.169
43	10.2.75.170/32	10.2.75.170 – 10.2.75.170	10.2.75.170
44	10.2.75.171/32	10.2.75.171 – 10.2.75.171	10.2.75.171
45	10.2.75.172/32	10.2.75.172 – 10.2.75.172	10.2.75.172
46	10.2.75.173/32	10.2.75.173 – 10.2.75.173	10.2.75.173
47	10.2.75.174/32	10.2.75.174 – 10.2.75.174	10.2.75.174
48	10.2.75.175/32	10.2.75.175 – 10.2.75.175	10.2.75.175
49	10.2.75.176/32	10.2.75.176 – 10.2.75.176	10.2.75.176
50	10.2.75.177/32	10.2.75.177 – 10.2.75.177	10.2.75.177
51	10.2.75.178/32	10.2.75.178 – 10.2.75.178	10.2.75.178
52	10.2.75.179/32	10.2.75.179 – 10.2.75.179	10.2.75.179
53	10.2.75.180/32	10.2.75.180 – 10.2.75.180	10.2.75.180
54	10.2.75.181/32	10.2.75.181 – 10.2.75.181	10.2.75.181
55	10.2.75.182/32	10.2.75.182 – 10.2.75.182	10.2.75.182
56	10.2.75.183/32	10.2.75.183 – 10.2.75.183	10.2.75.183
57	10.2.75.184/32	10.2.75.184 – 10.2.75.184	10.2.75.184
58	10.2.75.185/32	10.2.75.185 – 10.2.75.185	10.2.75.185
59	10.2.75.186/32	10.2.75.186 – 10.2.75.186	10.2.75.186
60	10.2.75.187/32	10.2.75.187 – 10.2.75.187	10.2.75.187
61	10.2.75.188/32	10.2.75.188 – 10.2.75.188	10.2.75.188
62	10.2.75.189/32	10.2.75.189 – 10.2.75.189	10.2.75.189
63	10.2.75.190/32	10.2.75.190 – 10.2.75.190	10.2.75.190
64	10.2.75.191/32	10.2.75.191 – 10.2.75.191	10.2.75.191
65	10.2.75.192/32	10.2.75.192 – 10.2.75.192	10.2.75.192
66	10.2.75.193/32	10.2.75.193 – 10.2.75.193	10.2.75.193
67	10.2.75.194/32	10.2.75.194 – 10.2.75.194	10.2.75.194
68	10.2.75.195/32	10.2.75.195 – 10.2.75.195	10.2.75.195
69	10.2.75.196/32	10.2.75.196 – 10.2.75.196	10.2.75.196
70	10.2.75.197/32	10.2.75.197 – 10.2.75.197	10.2.75.197
71	10.2.75.198/32	10.2.75.198 – 10.2.75.198	10.2.75.198
72	10.2.75.199/32	10.2.75.199 – 10.2.75.199	10.2.75.199
73	10.2.75.200/32	10.2.75.200 – 10.2.75.200	10.2.75.200
74	10.2.75.201/32	10.2.75.201 – 10.2.75.201	10.2.75.201
75	10.2.75.202/32	10.2.75.202 – 10.2.75.202	10.2.75.202
76	10.2.75.203/32	10.2.75.203 – 10.2.75.203	10.2.75.203
77	10.2.75.204/32	10.2.75.204 – 10.2.75.204	10.2.75.204
78	10.2.75.205/32	10.2.75.205 – 10.2.75.205	10.2.75.205
79	10.2.75.206/32	10.2.75.206 – 10.2.75.206	10.2.75.206
80	10.2.75.207/32	10.2.75.207 – 10.2.75.207	10.2.75.207
81	10.2.75.208/32	10.2.75.208 – 10.2.75.208	10.2.75.208
82	10.2.75.209/32	10.2.75.209 – 10.2.75.209	10.2.75.209
83	10.2.75.210/32	10.2.75.210 – 10.2.75.210	10.2.75.210
84	10.2.75.211/32	10.2.75.211 – 10.2.75.211	10.2.75.211
85	10.2.75.212/32	10.2.75.212 – 10.2.75.212	10.2.75.212
86	10.2.75.213/32	10.2.75.213 – 10.2.75.213	10.2.75.213
87	10.2.75.214/32	10.2.75.214 – 10.2.75.214	10.2.75.214
88	10.2.75.215/32	10.2.75.215 – 10.2.75.215	10.2.75.215
89	10.2.75.216/32	10.2.75.216 – 10.2.75.216	10.2.75.216
90	10.2.75.217/32	10.2.75.217 – 10.2.75.217	10.2.75.217
91	10.2.75.218/32	10.2.75.218 – 10.2.75.218	10.2.75.218
92	10.2.75.219/32	10.2.75.219 – 10.2.75.219	10.2.75.219
93	10.2.75.220/32	10.2.75.220 – 10.2.75.220	10.2.75.220
94	10.2.75.221/32	10.2.75.221 – 10.2.75.221	10.2.75.221
95	10.2.75.222/32	10.2.75.222 – 10.2.75.222	10.2.75.222
96	10.2.75.223/32	10.2.75.223 – 10.2.75.223	10.2.75.223
97	10.2.75.224/32	10.2.75.224 – 10.2.75.224	10.2.75.224
98	10.2.75.225/32	10.2.75.225 – 10.2.75.225	10.2.75.225
99	10.2.75.226/32	10.2.75.226 – 10.2.75.226	10.2.75.226
100	10.2.75.227/32	10.2.75.227 – 10.2.75.227	10.2.75.227
101	10.2.75.228/32	10.2.75.228 – 10.2.75.228	10.2.75.228
102	10.2.75.229/32	10.2.75.229 – 10.2.75.229	10.2.75.229
103	10.2.75.230/32	10.2.75.230 – 10.2.75.230	10.2.75.230
104	10.2.75.231/32	10.2.75.231 – 10.2.75.231	10.2.75.231
105	10.2.75.232/32	10.2.75.232 – 10.2.75.232	10.2.75.232
106	10.2.75.233/32	10.2.75.233 – 10.2.75.233	10.2.75.233
107	10.2.75.234/32	10.2.75.234 – 10.2.75.234	10.2.75.234
108	10.2.75.235/32	10.2.75.235 – 10.2.75.235	10.2.75.235
109	10.2.75.236/32	10.2.75.236 – 10.2.75.236	10.2.75.236
110	10.2.75.237/32	10.2.75.237 – 10.2.75.237	10.2.75.237
111	10.2.75.238/32	10.2.75.238 – 10.2.75.238	10.2.75.238
112	10.2.75.239/32	10.2.75.239 – 10.2.75.239	10.2.75.239
113	10.2.75.240/32	10.2.75.240 – 10.2.75.240	10.2.75.240
114	10.2.75.241/32	10.2.75.241 – 10.2.75.241	10.2.75.241
115	10.2.75.242/32	10.2.75.242 – 10.2.75.242	10.2.75.242
116	10.2.75.243/32	10.2.75.243 – 10.2.75.243	10.2.75.243
117	10.2.75.244/32	10.2.75.244 – 10.2.75.244	10.2.75.244
118	10.2.75.245/32	10.2.75.245 – 10.2.75.245	10.2.75.245
119	10.2.75.246/32	10.2.75.246 – 10.2.75.246	10.2.75.246
120	10.2.75.247/32	10.2.75.247 – 10.2.75.247	10.2.75.247
121	10.2.75.248/32	10.2.75.248 – 10.2.75.248	10.2.75.248
122	10.2.75.249/32	10.2.75.249 – 10.2.75.249	10.2.75.249
123	10.2.75.250/32	10.2.75.250 – 10.2.75.250	10.2.75.250
124	10.2.75.251/32	10.2.75.251 – 10.2.75.251	10.2.75.251
125	10.2.75.252/32	10.2.75.252 – 10.2.75.252	10.2.75.252
126	10.2.75.253/32	10.2.75.253 – 10.2.75.253	10.2.75.253
127	10.2.75.254/32	10.2.75.254 – 10.2.75.254	10.2.75.254
128	10.2.75.255/32	10.2.75.255 – 10.2.75.255	10.2.75.255

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 →