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)10.2.147.128/25

network10.2.147.128/25

broadcast10.2.147.255

first host10.2.147.129

last host10.2.147.254

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.2.147.128/25

address00001010.00000010.10010011.10000000

subnet mask11111111.11111111.11111111.10000000

network00001010.00000010.10010011.10000000

broadcast00001010.00000010.10010011.11111111

green = network part, grey = host part

hex0x0a029380

decimal167940992

reverse dns128.147.2.10.in-addr.arpa

ipv4-mapped::ffff:a02:9380

/25 split into /32 · 128 subnets

close ×

#	network	host range	broadcast
1	10.2.147.128/32	10.2.147.128 – 10.2.147.128	10.2.147.128
2	10.2.147.129/32	10.2.147.129 – 10.2.147.129	10.2.147.129
3	10.2.147.130/32	10.2.147.130 – 10.2.147.130	10.2.147.130
4	10.2.147.131/32	10.2.147.131 – 10.2.147.131	10.2.147.131
5	10.2.147.132/32	10.2.147.132 – 10.2.147.132	10.2.147.132
6	10.2.147.133/32	10.2.147.133 – 10.2.147.133	10.2.147.133
7	10.2.147.134/32	10.2.147.134 – 10.2.147.134	10.2.147.134
8	10.2.147.135/32	10.2.147.135 – 10.2.147.135	10.2.147.135
9	10.2.147.136/32	10.2.147.136 – 10.2.147.136	10.2.147.136
10	10.2.147.137/32	10.2.147.137 – 10.2.147.137	10.2.147.137
11	10.2.147.138/32	10.2.147.138 – 10.2.147.138	10.2.147.138
12	10.2.147.139/32	10.2.147.139 – 10.2.147.139	10.2.147.139
13	10.2.147.140/32	10.2.147.140 – 10.2.147.140	10.2.147.140
14	10.2.147.141/32	10.2.147.141 – 10.2.147.141	10.2.147.141
15	10.2.147.142/32	10.2.147.142 – 10.2.147.142	10.2.147.142
16	10.2.147.143/32	10.2.147.143 – 10.2.147.143	10.2.147.143
17	10.2.147.144/32	10.2.147.144 – 10.2.147.144	10.2.147.144
18	10.2.147.145/32	10.2.147.145 – 10.2.147.145	10.2.147.145
19	10.2.147.146/32	10.2.147.146 – 10.2.147.146	10.2.147.146
20	10.2.147.147/32	10.2.147.147 – 10.2.147.147	10.2.147.147
21	10.2.147.148/32	10.2.147.148 – 10.2.147.148	10.2.147.148
22	10.2.147.149/32	10.2.147.149 – 10.2.147.149	10.2.147.149
23	10.2.147.150/32	10.2.147.150 – 10.2.147.150	10.2.147.150
24	10.2.147.151/32	10.2.147.151 – 10.2.147.151	10.2.147.151
25	10.2.147.152/32	10.2.147.152 – 10.2.147.152	10.2.147.152
26	10.2.147.153/32	10.2.147.153 – 10.2.147.153	10.2.147.153
27	10.2.147.154/32	10.2.147.154 – 10.2.147.154	10.2.147.154
28	10.2.147.155/32	10.2.147.155 – 10.2.147.155	10.2.147.155
29	10.2.147.156/32	10.2.147.156 – 10.2.147.156	10.2.147.156
30	10.2.147.157/32	10.2.147.157 – 10.2.147.157	10.2.147.157
31	10.2.147.158/32	10.2.147.158 – 10.2.147.158	10.2.147.158
32	10.2.147.159/32	10.2.147.159 – 10.2.147.159	10.2.147.159
33	10.2.147.160/32	10.2.147.160 – 10.2.147.160	10.2.147.160
34	10.2.147.161/32	10.2.147.161 – 10.2.147.161	10.2.147.161
35	10.2.147.162/32	10.2.147.162 – 10.2.147.162	10.2.147.162
36	10.2.147.163/32	10.2.147.163 – 10.2.147.163	10.2.147.163
37	10.2.147.164/32	10.2.147.164 – 10.2.147.164	10.2.147.164
38	10.2.147.165/32	10.2.147.165 – 10.2.147.165	10.2.147.165
39	10.2.147.166/32	10.2.147.166 – 10.2.147.166	10.2.147.166
40	10.2.147.167/32	10.2.147.167 – 10.2.147.167	10.2.147.167
41	10.2.147.168/32	10.2.147.168 – 10.2.147.168	10.2.147.168
42	10.2.147.169/32	10.2.147.169 – 10.2.147.169	10.2.147.169
43	10.2.147.170/32	10.2.147.170 – 10.2.147.170	10.2.147.170
44	10.2.147.171/32	10.2.147.171 – 10.2.147.171	10.2.147.171
45	10.2.147.172/32	10.2.147.172 – 10.2.147.172	10.2.147.172
46	10.2.147.173/32	10.2.147.173 – 10.2.147.173	10.2.147.173
47	10.2.147.174/32	10.2.147.174 – 10.2.147.174	10.2.147.174
48	10.2.147.175/32	10.2.147.175 – 10.2.147.175	10.2.147.175
49	10.2.147.176/32	10.2.147.176 – 10.2.147.176	10.2.147.176
50	10.2.147.177/32	10.2.147.177 – 10.2.147.177	10.2.147.177
51	10.2.147.178/32	10.2.147.178 – 10.2.147.178	10.2.147.178
52	10.2.147.179/32	10.2.147.179 – 10.2.147.179	10.2.147.179
53	10.2.147.180/32	10.2.147.180 – 10.2.147.180	10.2.147.180
54	10.2.147.181/32	10.2.147.181 – 10.2.147.181	10.2.147.181
55	10.2.147.182/32	10.2.147.182 – 10.2.147.182	10.2.147.182
56	10.2.147.183/32	10.2.147.183 – 10.2.147.183	10.2.147.183
57	10.2.147.184/32	10.2.147.184 – 10.2.147.184	10.2.147.184
58	10.2.147.185/32	10.2.147.185 – 10.2.147.185	10.2.147.185
59	10.2.147.186/32	10.2.147.186 – 10.2.147.186	10.2.147.186
60	10.2.147.187/32	10.2.147.187 – 10.2.147.187	10.2.147.187
61	10.2.147.188/32	10.2.147.188 – 10.2.147.188	10.2.147.188
62	10.2.147.189/32	10.2.147.189 – 10.2.147.189	10.2.147.189
63	10.2.147.190/32	10.2.147.190 – 10.2.147.190	10.2.147.190
64	10.2.147.191/32	10.2.147.191 – 10.2.147.191	10.2.147.191
65	10.2.147.192/32	10.2.147.192 – 10.2.147.192	10.2.147.192
66	10.2.147.193/32	10.2.147.193 – 10.2.147.193	10.2.147.193
67	10.2.147.194/32	10.2.147.194 – 10.2.147.194	10.2.147.194
68	10.2.147.195/32	10.2.147.195 – 10.2.147.195	10.2.147.195
69	10.2.147.196/32	10.2.147.196 – 10.2.147.196	10.2.147.196
70	10.2.147.197/32	10.2.147.197 – 10.2.147.197	10.2.147.197
71	10.2.147.198/32	10.2.147.198 – 10.2.147.198	10.2.147.198
72	10.2.147.199/32	10.2.147.199 – 10.2.147.199	10.2.147.199
73	10.2.147.200/32	10.2.147.200 – 10.2.147.200	10.2.147.200
74	10.2.147.201/32	10.2.147.201 – 10.2.147.201	10.2.147.201
75	10.2.147.202/32	10.2.147.202 – 10.2.147.202	10.2.147.202
76	10.2.147.203/32	10.2.147.203 – 10.2.147.203	10.2.147.203
77	10.2.147.204/32	10.2.147.204 – 10.2.147.204	10.2.147.204
78	10.2.147.205/32	10.2.147.205 – 10.2.147.205	10.2.147.205
79	10.2.147.206/32	10.2.147.206 – 10.2.147.206	10.2.147.206
80	10.2.147.207/32	10.2.147.207 – 10.2.147.207	10.2.147.207
81	10.2.147.208/32	10.2.147.208 – 10.2.147.208	10.2.147.208
82	10.2.147.209/32	10.2.147.209 – 10.2.147.209	10.2.147.209
83	10.2.147.210/32	10.2.147.210 – 10.2.147.210	10.2.147.210
84	10.2.147.211/32	10.2.147.211 – 10.2.147.211	10.2.147.211
85	10.2.147.212/32	10.2.147.212 – 10.2.147.212	10.2.147.212
86	10.2.147.213/32	10.2.147.213 – 10.2.147.213	10.2.147.213
87	10.2.147.214/32	10.2.147.214 – 10.2.147.214	10.2.147.214
88	10.2.147.215/32	10.2.147.215 – 10.2.147.215	10.2.147.215
89	10.2.147.216/32	10.2.147.216 – 10.2.147.216	10.2.147.216
90	10.2.147.217/32	10.2.147.217 – 10.2.147.217	10.2.147.217
91	10.2.147.218/32	10.2.147.218 – 10.2.147.218	10.2.147.218
92	10.2.147.219/32	10.2.147.219 – 10.2.147.219	10.2.147.219
93	10.2.147.220/32	10.2.147.220 – 10.2.147.220	10.2.147.220
94	10.2.147.221/32	10.2.147.221 – 10.2.147.221	10.2.147.221
95	10.2.147.222/32	10.2.147.222 – 10.2.147.222	10.2.147.222
96	10.2.147.223/32	10.2.147.223 – 10.2.147.223	10.2.147.223
97	10.2.147.224/32	10.2.147.224 – 10.2.147.224	10.2.147.224
98	10.2.147.225/32	10.2.147.225 – 10.2.147.225	10.2.147.225
99	10.2.147.226/32	10.2.147.226 – 10.2.147.226	10.2.147.226
100	10.2.147.227/32	10.2.147.227 – 10.2.147.227	10.2.147.227
101	10.2.147.228/32	10.2.147.228 – 10.2.147.228	10.2.147.228
102	10.2.147.229/32	10.2.147.229 – 10.2.147.229	10.2.147.229
103	10.2.147.230/32	10.2.147.230 – 10.2.147.230	10.2.147.230
104	10.2.147.231/32	10.2.147.231 – 10.2.147.231	10.2.147.231
105	10.2.147.232/32	10.2.147.232 – 10.2.147.232	10.2.147.232
106	10.2.147.233/32	10.2.147.233 – 10.2.147.233	10.2.147.233
107	10.2.147.234/32	10.2.147.234 – 10.2.147.234	10.2.147.234
108	10.2.147.235/32	10.2.147.235 – 10.2.147.235	10.2.147.235
109	10.2.147.236/32	10.2.147.236 – 10.2.147.236	10.2.147.236
110	10.2.147.237/32	10.2.147.237 – 10.2.147.237	10.2.147.237
111	10.2.147.238/32	10.2.147.238 – 10.2.147.238	10.2.147.238
112	10.2.147.239/32	10.2.147.239 – 10.2.147.239	10.2.147.239
113	10.2.147.240/32	10.2.147.240 – 10.2.147.240	10.2.147.240
114	10.2.147.241/32	10.2.147.241 – 10.2.147.241	10.2.147.241
115	10.2.147.242/32	10.2.147.242 – 10.2.147.242	10.2.147.242
116	10.2.147.243/32	10.2.147.243 – 10.2.147.243	10.2.147.243
117	10.2.147.244/32	10.2.147.244 – 10.2.147.244	10.2.147.244
118	10.2.147.245/32	10.2.147.245 – 10.2.147.245	10.2.147.245
119	10.2.147.246/32	10.2.147.246 – 10.2.147.246	10.2.147.246
120	10.2.147.247/32	10.2.147.247 – 10.2.147.247	10.2.147.247
121	10.2.147.248/32	10.2.147.248 – 10.2.147.248	10.2.147.248
122	10.2.147.249/32	10.2.147.249 – 10.2.147.249	10.2.147.249
123	10.2.147.250/32	10.2.147.250 – 10.2.147.250	10.2.147.250
124	10.2.147.251/32	10.2.147.251 – 10.2.147.251	10.2.147.251
125	10.2.147.252/32	10.2.147.252 – 10.2.147.252	10.2.147.252
126	10.2.147.253/32	10.2.147.253 – 10.2.147.253	10.2.147.253
127	10.2.147.254/32	10.2.147.254 – 10.2.147.254	10.2.147.254
128	10.2.147.255/32	10.2.147.255 – 10.2.147.255	10.2.147.255

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 →