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)10.2.35.128/25

network10.2.35.128/25

broadcast10.2.35.255

first host10.2.35.129

last host10.2.35.254

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.2.35.128/25

address00001010.00000010.00100011.10000000

subnet mask11111111.11111111.11111111.10000000

network00001010.00000010.00100011.10000000

broadcast00001010.00000010.00100011.11111111

green = network part, grey = host part

hex0x0a022380

decimal167912320

reverse dns128.35.2.10.in-addr.arpa

ipv4-mapped::ffff:a02:2380

/25 split into /32 · 128 subnets

close ×

#	network	host range	broadcast
1	10.2.35.128/32	10.2.35.128 – 10.2.35.128	10.2.35.128
2	10.2.35.129/32	10.2.35.129 – 10.2.35.129	10.2.35.129
3	10.2.35.130/32	10.2.35.130 – 10.2.35.130	10.2.35.130
4	10.2.35.131/32	10.2.35.131 – 10.2.35.131	10.2.35.131
5	10.2.35.132/32	10.2.35.132 – 10.2.35.132	10.2.35.132
6	10.2.35.133/32	10.2.35.133 – 10.2.35.133	10.2.35.133
7	10.2.35.134/32	10.2.35.134 – 10.2.35.134	10.2.35.134
8	10.2.35.135/32	10.2.35.135 – 10.2.35.135	10.2.35.135
9	10.2.35.136/32	10.2.35.136 – 10.2.35.136	10.2.35.136
10	10.2.35.137/32	10.2.35.137 – 10.2.35.137	10.2.35.137
11	10.2.35.138/32	10.2.35.138 – 10.2.35.138	10.2.35.138
12	10.2.35.139/32	10.2.35.139 – 10.2.35.139	10.2.35.139
13	10.2.35.140/32	10.2.35.140 – 10.2.35.140	10.2.35.140
14	10.2.35.141/32	10.2.35.141 – 10.2.35.141	10.2.35.141
15	10.2.35.142/32	10.2.35.142 – 10.2.35.142	10.2.35.142
16	10.2.35.143/32	10.2.35.143 – 10.2.35.143	10.2.35.143
17	10.2.35.144/32	10.2.35.144 – 10.2.35.144	10.2.35.144
18	10.2.35.145/32	10.2.35.145 – 10.2.35.145	10.2.35.145
19	10.2.35.146/32	10.2.35.146 – 10.2.35.146	10.2.35.146
20	10.2.35.147/32	10.2.35.147 – 10.2.35.147	10.2.35.147
21	10.2.35.148/32	10.2.35.148 – 10.2.35.148	10.2.35.148
22	10.2.35.149/32	10.2.35.149 – 10.2.35.149	10.2.35.149
23	10.2.35.150/32	10.2.35.150 – 10.2.35.150	10.2.35.150
24	10.2.35.151/32	10.2.35.151 – 10.2.35.151	10.2.35.151
25	10.2.35.152/32	10.2.35.152 – 10.2.35.152	10.2.35.152
26	10.2.35.153/32	10.2.35.153 – 10.2.35.153	10.2.35.153
27	10.2.35.154/32	10.2.35.154 – 10.2.35.154	10.2.35.154
28	10.2.35.155/32	10.2.35.155 – 10.2.35.155	10.2.35.155
29	10.2.35.156/32	10.2.35.156 – 10.2.35.156	10.2.35.156
30	10.2.35.157/32	10.2.35.157 – 10.2.35.157	10.2.35.157
31	10.2.35.158/32	10.2.35.158 – 10.2.35.158	10.2.35.158
32	10.2.35.159/32	10.2.35.159 – 10.2.35.159	10.2.35.159
33	10.2.35.160/32	10.2.35.160 – 10.2.35.160	10.2.35.160
34	10.2.35.161/32	10.2.35.161 – 10.2.35.161	10.2.35.161
35	10.2.35.162/32	10.2.35.162 – 10.2.35.162	10.2.35.162
36	10.2.35.163/32	10.2.35.163 – 10.2.35.163	10.2.35.163
37	10.2.35.164/32	10.2.35.164 – 10.2.35.164	10.2.35.164
38	10.2.35.165/32	10.2.35.165 – 10.2.35.165	10.2.35.165
39	10.2.35.166/32	10.2.35.166 – 10.2.35.166	10.2.35.166
40	10.2.35.167/32	10.2.35.167 – 10.2.35.167	10.2.35.167
41	10.2.35.168/32	10.2.35.168 – 10.2.35.168	10.2.35.168
42	10.2.35.169/32	10.2.35.169 – 10.2.35.169	10.2.35.169
43	10.2.35.170/32	10.2.35.170 – 10.2.35.170	10.2.35.170
44	10.2.35.171/32	10.2.35.171 – 10.2.35.171	10.2.35.171
45	10.2.35.172/32	10.2.35.172 – 10.2.35.172	10.2.35.172
46	10.2.35.173/32	10.2.35.173 – 10.2.35.173	10.2.35.173
47	10.2.35.174/32	10.2.35.174 – 10.2.35.174	10.2.35.174
48	10.2.35.175/32	10.2.35.175 – 10.2.35.175	10.2.35.175
49	10.2.35.176/32	10.2.35.176 – 10.2.35.176	10.2.35.176
50	10.2.35.177/32	10.2.35.177 – 10.2.35.177	10.2.35.177
51	10.2.35.178/32	10.2.35.178 – 10.2.35.178	10.2.35.178
52	10.2.35.179/32	10.2.35.179 – 10.2.35.179	10.2.35.179
53	10.2.35.180/32	10.2.35.180 – 10.2.35.180	10.2.35.180
54	10.2.35.181/32	10.2.35.181 – 10.2.35.181	10.2.35.181
55	10.2.35.182/32	10.2.35.182 – 10.2.35.182	10.2.35.182
56	10.2.35.183/32	10.2.35.183 – 10.2.35.183	10.2.35.183
57	10.2.35.184/32	10.2.35.184 – 10.2.35.184	10.2.35.184
58	10.2.35.185/32	10.2.35.185 – 10.2.35.185	10.2.35.185
59	10.2.35.186/32	10.2.35.186 – 10.2.35.186	10.2.35.186
60	10.2.35.187/32	10.2.35.187 – 10.2.35.187	10.2.35.187
61	10.2.35.188/32	10.2.35.188 – 10.2.35.188	10.2.35.188
62	10.2.35.189/32	10.2.35.189 – 10.2.35.189	10.2.35.189
63	10.2.35.190/32	10.2.35.190 – 10.2.35.190	10.2.35.190
64	10.2.35.191/32	10.2.35.191 – 10.2.35.191	10.2.35.191
65	10.2.35.192/32	10.2.35.192 – 10.2.35.192	10.2.35.192
66	10.2.35.193/32	10.2.35.193 – 10.2.35.193	10.2.35.193
67	10.2.35.194/32	10.2.35.194 – 10.2.35.194	10.2.35.194
68	10.2.35.195/32	10.2.35.195 – 10.2.35.195	10.2.35.195
69	10.2.35.196/32	10.2.35.196 – 10.2.35.196	10.2.35.196
70	10.2.35.197/32	10.2.35.197 – 10.2.35.197	10.2.35.197
71	10.2.35.198/32	10.2.35.198 – 10.2.35.198	10.2.35.198
72	10.2.35.199/32	10.2.35.199 – 10.2.35.199	10.2.35.199
73	10.2.35.200/32	10.2.35.200 – 10.2.35.200	10.2.35.200
74	10.2.35.201/32	10.2.35.201 – 10.2.35.201	10.2.35.201
75	10.2.35.202/32	10.2.35.202 – 10.2.35.202	10.2.35.202
76	10.2.35.203/32	10.2.35.203 – 10.2.35.203	10.2.35.203
77	10.2.35.204/32	10.2.35.204 – 10.2.35.204	10.2.35.204
78	10.2.35.205/32	10.2.35.205 – 10.2.35.205	10.2.35.205
79	10.2.35.206/32	10.2.35.206 – 10.2.35.206	10.2.35.206
80	10.2.35.207/32	10.2.35.207 – 10.2.35.207	10.2.35.207
81	10.2.35.208/32	10.2.35.208 – 10.2.35.208	10.2.35.208
82	10.2.35.209/32	10.2.35.209 – 10.2.35.209	10.2.35.209
83	10.2.35.210/32	10.2.35.210 – 10.2.35.210	10.2.35.210
84	10.2.35.211/32	10.2.35.211 – 10.2.35.211	10.2.35.211
85	10.2.35.212/32	10.2.35.212 – 10.2.35.212	10.2.35.212
86	10.2.35.213/32	10.2.35.213 – 10.2.35.213	10.2.35.213
87	10.2.35.214/32	10.2.35.214 – 10.2.35.214	10.2.35.214
88	10.2.35.215/32	10.2.35.215 – 10.2.35.215	10.2.35.215
89	10.2.35.216/32	10.2.35.216 – 10.2.35.216	10.2.35.216
90	10.2.35.217/32	10.2.35.217 – 10.2.35.217	10.2.35.217
91	10.2.35.218/32	10.2.35.218 – 10.2.35.218	10.2.35.218
92	10.2.35.219/32	10.2.35.219 – 10.2.35.219	10.2.35.219
93	10.2.35.220/32	10.2.35.220 – 10.2.35.220	10.2.35.220
94	10.2.35.221/32	10.2.35.221 – 10.2.35.221	10.2.35.221
95	10.2.35.222/32	10.2.35.222 – 10.2.35.222	10.2.35.222
96	10.2.35.223/32	10.2.35.223 – 10.2.35.223	10.2.35.223
97	10.2.35.224/32	10.2.35.224 – 10.2.35.224	10.2.35.224
98	10.2.35.225/32	10.2.35.225 – 10.2.35.225	10.2.35.225
99	10.2.35.226/32	10.2.35.226 – 10.2.35.226	10.2.35.226
100	10.2.35.227/32	10.2.35.227 – 10.2.35.227	10.2.35.227
101	10.2.35.228/32	10.2.35.228 – 10.2.35.228	10.2.35.228
102	10.2.35.229/32	10.2.35.229 – 10.2.35.229	10.2.35.229
103	10.2.35.230/32	10.2.35.230 – 10.2.35.230	10.2.35.230
104	10.2.35.231/32	10.2.35.231 – 10.2.35.231	10.2.35.231
105	10.2.35.232/32	10.2.35.232 – 10.2.35.232	10.2.35.232
106	10.2.35.233/32	10.2.35.233 – 10.2.35.233	10.2.35.233
107	10.2.35.234/32	10.2.35.234 – 10.2.35.234	10.2.35.234
108	10.2.35.235/32	10.2.35.235 – 10.2.35.235	10.2.35.235
109	10.2.35.236/32	10.2.35.236 – 10.2.35.236	10.2.35.236
110	10.2.35.237/32	10.2.35.237 – 10.2.35.237	10.2.35.237
111	10.2.35.238/32	10.2.35.238 – 10.2.35.238	10.2.35.238
112	10.2.35.239/32	10.2.35.239 – 10.2.35.239	10.2.35.239
113	10.2.35.240/32	10.2.35.240 – 10.2.35.240	10.2.35.240
114	10.2.35.241/32	10.2.35.241 – 10.2.35.241	10.2.35.241
115	10.2.35.242/32	10.2.35.242 – 10.2.35.242	10.2.35.242
116	10.2.35.243/32	10.2.35.243 – 10.2.35.243	10.2.35.243
117	10.2.35.244/32	10.2.35.244 – 10.2.35.244	10.2.35.244
118	10.2.35.245/32	10.2.35.245 – 10.2.35.245	10.2.35.245
119	10.2.35.246/32	10.2.35.246 – 10.2.35.246	10.2.35.246
120	10.2.35.247/32	10.2.35.247 – 10.2.35.247	10.2.35.247
121	10.2.35.248/32	10.2.35.248 – 10.2.35.248	10.2.35.248
122	10.2.35.249/32	10.2.35.249 – 10.2.35.249	10.2.35.249
123	10.2.35.250/32	10.2.35.250 – 10.2.35.250	10.2.35.250
124	10.2.35.251/32	10.2.35.251 – 10.2.35.251	10.2.35.251
125	10.2.35.252/32	10.2.35.252 – 10.2.35.252	10.2.35.252
126	10.2.35.253/32	10.2.35.253 – 10.2.35.253	10.2.35.253
127	10.2.35.254/32	10.2.35.254 – 10.2.35.254	10.2.35.254
128	10.2.35.255/32	10.2.35.255 – 10.2.35.255	10.2.35.255

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 →