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)10.3.97.128/25

network10.3.97.128/25

broadcast10.3.97.255

first host10.3.97.129

last host10.3.97.254

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.3.97.128/25

address00001010.00000011.01100001.10000000

subnet mask11111111.11111111.11111111.10000000

network00001010.00000011.01100001.10000000

broadcast00001010.00000011.01100001.11111111

green = network part, grey = host part

hex0x0a036180

decimal167993728

reverse dns128.97.3.10.in-addr.arpa

ipv4-mapped::ffff:a03:6180

/25 split into /32 · 128 subnets

close ×

#	network	host range	broadcast
1	10.3.97.128/32	10.3.97.128 – 10.3.97.128	10.3.97.128
2	10.3.97.129/32	10.3.97.129 – 10.3.97.129	10.3.97.129
3	10.3.97.130/32	10.3.97.130 – 10.3.97.130	10.3.97.130
4	10.3.97.131/32	10.3.97.131 – 10.3.97.131	10.3.97.131
5	10.3.97.132/32	10.3.97.132 – 10.3.97.132	10.3.97.132
6	10.3.97.133/32	10.3.97.133 – 10.3.97.133	10.3.97.133
7	10.3.97.134/32	10.3.97.134 – 10.3.97.134	10.3.97.134
8	10.3.97.135/32	10.3.97.135 – 10.3.97.135	10.3.97.135
9	10.3.97.136/32	10.3.97.136 – 10.3.97.136	10.3.97.136
10	10.3.97.137/32	10.3.97.137 – 10.3.97.137	10.3.97.137
11	10.3.97.138/32	10.3.97.138 – 10.3.97.138	10.3.97.138
12	10.3.97.139/32	10.3.97.139 – 10.3.97.139	10.3.97.139
13	10.3.97.140/32	10.3.97.140 – 10.3.97.140	10.3.97.140
14	10.3.97.141/32	10.3.97.141 – 10.3.97.141	10.3.97.141
15	10.3.97.142/32	10.3.97.142 – 10.3.97.142	10.3.97.142
16	10.3.97.143/32	10.3.97.143 – 10.3.97.143	10.3.97.143
17	10.3.97.144/32	10.3.97.144 – 10.3.97.144	10.3.97.144
18	10.3.97.145/32	10.3.97.145 – 10.3.97.145	10.3.97.145
19	10.3.97.146/32	10.3.97.146 – 10.3.97.146	10.3.97.146
20	10.3.97.147/32	10.3.97.147 – 10.3.97.147	10.3.97.147
21	10.3.97.148/32	10.3.97.148 – 10.3.97.148	10.3.97.148
22	10.3.97.149/32	10.3.97.149 – 10.3.97.149	10.3.97.149
23	10.3.97.150/32	10.3.97.150 – 10.3.97.150	10.3.97.150
24	10.3.97.151/32	10.3.97.151 – 10.3.97.151	10.3.97.151
25	10.3.97.152/32	10.3.97.152 – 10.3.97.152	10.3.97.152
26	10.3.97.153/32	10.3.97.153 – 10.3.97.153	10.3.97.153
27	10.3.97.154/32	10.3.97.154 – 10.3.97.154	10.3.97.154
28	10.3.97.155/32	10.3.97.155 – 10.3.97.155	10.3.97.155
29	10.3.97.156/32	10.3.97.156 – 10.3.97.156	10.3.97.156
30	10.3.97.157/32	10.3.97.157 – 10.3.97.157	10.3.97.157
31	10.3.97.158/32	10.3.97.158 – 10.3.97.158	10.3.97.158
32	10.3.97.159/32	10.3.97.159 – 10.3.97.159	10.3.97.159
33	10.3.97.160/32	10.3.97.160 – 10.3.97.160	10.3.97.160
34	10.3.97.161/32	10.3.97.161 – 10.3.97.161	10.3.97.161
35	10.3.97.162/32	10.3.97.162 – 10.3.97.162	10.3.97.162
36	10.3.97.163/32	10.3.97.163 – 10.3.97.163	10.3.97.163
37	10.3.97.164/32	10.3.97.164 – 10.3.97.164	10.3.97.164
38	10.3.97.165/32	10.3.97.165 – 10.3.97.165	10.3.97.165
39	10.3.97.166/32	10.3.97.166 – 10.3.97.166	10.3.97.166
40	10.3.97.167/32	10.3.97.167 – 10.3.97.167	10.3.97.167
41	10.3.97.168/32	10.3.97.168 – 10.3.97.168	10.3.97.168
42	10.3.97.169/32	10.3.97.169 – 10.3.97.169	10.3.97.169
43	10.3.97.170/32	10.3.97.170 – 10.3.97.170	10.3.97.170
44	10.3.97.171/32	10.3.97.171 – 10.3.97.171	10.3.97.171
45	10.3.97.172/32	10.3.97.172 – 10.3.97.172	10.3.97.172
46	10.3.97.173/32	10.3.97.173 – 10.3.97.173	10.3.97.173
47	10.3.97.174/32	10.3.97.174 – 10.3.97.174	10.3.97.174
48	10.3.97.175/32	10.3.97.175 – 10.3.97.175	10.3.97.175
49	10.3.97.176/32	10.3.97.176 – 10.3.97.176	10.3.97.176
50	10.3.97.177/32	10.3.97.177 – 10.3.97.177	10.3.97.177
51	10.3.97.178/32	10.3.97.178 – 10.3.97.178	10.3.97.178
52	10.3.97.179/32	10.3.97.179 – 10.3.97.179	10.3.97.179
53	10.3.97.180/32	10.3.97.180 – 10.3.97.180	10.3.97.180
54	10.3.97.181/32	10.3.97.181 – 10.3.97.181	10.3.97.181
55	10.3.97.182/32	10.3.97.182 – 10.3.97.182	10.3.97.182
56	10.3.97.183/32	10.3.97.183 – 10.3.97.183	10.3.97.183
57	10.3.97.184/32	10.3.97.184 – 10.3.97.184	10.3.97.184
58	10.3.97.185/32	10.3.97.185 – 10.3.97.185	10.3.97.185
59	10.3.97.186/32	10.3.97.186 – 10.3.97.186	10.3.97.186
60	10.3.97.187/32	10.3.97.187 – 10.3.97.187	10.3.97.187
61	10.3.97.188/32	10.3.97.188 – 10.3.97.188	10.3.97.188
62	10.3.97.189/32	10.3.97.189 – 10.3.97.189	10.3.97.189
63	10.3.97.190/32	10.3.97.190 – 10.3.97.190	10.3.97.190
64	10.3.97.191/32	10.3.97.191 – 10.3.97.191	10.3.97.191
65	10.3.97.192/32	10.3.97.192 – 10.3.97.192	10.3.97.192
66	10.3.97.193/32	10.3.97.193 – 10.3.97.193	10.3.97.193
67	10.3.97.194/32	10.3.97.194 – 10.3.97.194	10.3.97.194
68	10.3.97.195/32	10.3.97.195 – 10.3.97.195	10.3.97.195
69	10.3.97.196/32	10.3.97.196 – 10.3.97.196	10.3.97.196
70	10.3.97.197/32	10.3.97.197 – 10.3.97.197	10.3.97.197
71	10.3.97.198/32	10.3.97.198 – 10.3.97.198	10.3.97.198
72	10.3.97.199/32	10.3.97.199 – 10.3.97.199	10.3.97.199
73	10.3.97.200/32	10.3.97.200 – 10.3.97.200	10.3.97.200
74	10.3.97.201/32	10.3.97.201 – 10.3.97.201	10.3.97.201
75	10.3.97.202/32	10.3.97.202 – 10.3.97.202	10.3.97.202
76	10.3.97.203/32	10.3.97.203 – 10.3.97.203	10.3.97.203
77	10.3.97.204/32	10.3.97.204 – 10.3.97.204	10.3.97.204
78	10.3.97.205/32	10.3.97.205 – 10.3.97.205	10.3.97.205
79	10.3.97.206/32	10.3.97.206 – 10.3.97.206	10.3.97.206
80	10.3.97.207/32	10.3.97.207 – 10.3.97.207	10.3.97.207
81	10.3.97.208/32	10.3.97.208 – 10.3.97.208	10.3.97.208
82	10.3.97.209/32	10.3.97.209 – 10.3.97.209	10.3.97.209
83	10.3.97.210/32	10.3.97.210 – 10.3.97.210	10.3.97.210
84	10.3.97.211/32	10.3.97.211 – 10.3.97.211	10.3.97.211
85	10.3.97.212/32	10.3.97.212 – 10.3.97.212	10.3.97.212
86	10.3.97.213/32	10.3.97.213 – 10.3.97.213	10.3.97.213
87	10.3.97.214/32	10.3.97.214 – 10.3.97.214	10.3.97.214
88	10.3.97.215/32	10.3.97.215 – 10.3.97.215	10.3.97.215
89	10.3.97.216/32	10.3.97.216 – 10.3.97.216	10.3.97.216
90	10.3.97.217/32	10.3.97.217 – 10.3.97.217	10.3.97.217
91	10.3.97.218/32	10.3.97.218 – 10.3.97.218	10.3.97.218
92	10.3.97.219/32	10.3.97.219 – 10.3.97.219	10.3.97.219
93	10.3.97.220/32	10.3.97.220 – 10.3.97.220	10.3.97.220
94	10.3.97.221/32	10.3.97.221 – 10.3.97.221	10.3.97.221
95	10.3.97.222/32	10.3.97.222 – 10.3.97.222	10.3.97.222
96	10.3.97.223/32	10.3.97.223 – 10.3.97.223	10.3.97.223
97	10.3.97.224/32	10.3.97.224 – 10.3.97.224	10.3.97.224
98	10.3.97.225/32	10.3.97.225 – 10.3.97.225	10.3.97.225
99	10.3.97.226/32	10.3.97.226 – 10.3.97.226	10.3.97.226
100	10.3.97.227/32	10.3.97.227 – 10.3.97.227	10.3.97.227
101	10.3.97.228/32	10.3.97.228 – 10.3.97.228	10.3.97.228
102	10.3.97.229/32	10.3.97.229 – 10.3.97.229	10.3.97.229
103	10.3.97.230/32	10.3.97.230 – 10.3.97.230	10.3.97.230
104	10.3.97.231/32	10.3.97.231 – 10.3.97.231	10.3.97.231
105	10.3.97.232/32	10.3.97.232 – 10.3.97.232	10.3.97.232
106	10.3.97.233/32	10.3.97.233 – 10.3.97.233	10.3.97.233
107	10.3.97.234/32	10.3.97.234 – 10.3.97.234	10.3.97.234
108	10.3.97.235/32	10.3.97.235 – 10.3.97.235	10.3.97.235
109	10.3.97.236/32	10.3.97.236 – 10.3.97.236	10.3.97.236
110	10.3.97.237/32	10.3.97.237 – 10.3.97.237	10.3.97.237
111	10.3.97.238/32	10.3.97.238 – 10.3.97.238	10.3.97.238
112	10.3.97.239/32	10.3.97.239 – 10.3.97.239	10.3.97.239
113	10.3.97.240/32	10.3.97.240 – 10.3.97.240	10.3.97.240
114	10.3.97.241/32	10.3.97.241 – 10.3.97.241	10.3.97.241
115	10.3.97.242/32	10.3.97.242 – 10.3.97.242	10.3.97.242
116	10.3.97.243/32	10.3.97.243 – 10.3.97.243	10.3.97.243
117	10.3.97.244/32	10.3.97.244 – 10.3.97.244	10.3.97.244
118	10.3.97.245/32	10.3.97.245 – 10.3.97.245	10.3.97.245
119	10.3.97.246/32	10.3.97.246 – 10.3.97.246	10.3.97.246
120	10.3.97.247/32	10.3.97.247 – 10.3.97.247	10.3.97.247
121	10.3.97.248/32	10.3.97.248 – 10.3.97.248	10.3.97.248
122	10.3.97.249/32	10.3.97.249 – 10.3.97.249	10.3.97.249
123	10.3.97.250/32	10.3.97.250 – 10.3.97.250	10.3.97.250
124	10.3.97.251/32	10.3.97.251 – 10.3.97.251	10.3.97.251
125	10.3.97.252/32	10.3.97.252 – 10.3.97.252	10.3.97.252
126	10.3.97.253/32	10.3.97.253 – 10.3.97.253	10.3.97.253
127	10.3.97.254/32	10.3.97.254 – 10.3.97.254	10.3.97.254
128	10.3.97.255/32	10.3.97.255 – 10.3.97.255	10.3.97.255

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 →