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)10.2.34.128/25

network10.2.34.128/25

broadcast10.2.34.255

first host10.2.34.129

last host10.2.34.254

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.2.34.128/25

address00001010.00000010.00100010.10000000

subnet mask11111111.11111111.11111111.10000000

network00001010.00000010.00100010.10000000

broadcast00001010.00000010.00100010.11111111

green = network part, grey = host part

hex0x0a022280

decimal167912064

reverse dns128.34.2.10.in-addr.arpa

ipv4-mapped::ffff:a02:2280

/25 split into /32 · 128 subnets

close ×

#	network	host range	broadcast
1	10.2.34.128/32	10.2.34.128 – 10.2.34.128	10.2.34.128
2	10.2.34.129/32	10.2.34.129 – 10.2.34.129	10.2.34.129
3	10.2.34.130/32	10.2.34.130 – 10.2.34.130	10.2.34.130
4	10.2.34.131/32	10.2.34.131 – 10.2.34.131	10.2.34.131
5	10.2.34.132/32	10.2.34.132 – 10.2.34.132	10.2.34.132
6	10.2.34.133/32	10.2.34.133 – 10.2.34.133	10.2.34.133
7	10.2.34.134/32	10.2.34.134 – 10.2.34.134	10.2.34.134
8	10.2.34.135/32	10.2.34.135 – 10.2.34.135	10.2.34.135
9	10.2.34.136/32	10.2.34.136 – 10.2.34.136	10.2.34.136
10	10.2.34.137/32	10.2.34.137 – 10.2.34.137	10.2.34.137
11	10.2.34.138/32	10.2.34.138 – 10.2.34.138	10.2.34.138
12	10.2.34.139/32	10.2.34.139 – 10.2.34.139	10.2.34.139
13	10.2.34.140/32	10.2.34.140 – 10.2.34.140	10.2.34.140
14	10.2.34.141/32	10.2.34.141 – 10.2.34.141	10.2.34.141
15	10.2.34.142/32	10.2.34.142 – 10.2.34.142	10.2.34.142
16	10.2.34.143/32	10.2.34.143 – 10.2.34.143	10.2.34.143
17	10.2.34.144/32	10.2.34.144 – 10.2.34.144	10.2.34.144
18	10.2.34.145/32	10.2.34.145 – 10.2.34.145	10.2.34.145
19	10.2.34.146/32	10.2.34.146 – 10.2.34.146	10.2.34.146
20	10.2.34.147/32	10.2.34.147 – 10.2.34.147	10.2.34.147
21	10.2.34.148/32	10.2.34.148 – 10.2.34.148	10.2.34.148
22	10.2.34.149/32	10.2.34.149 – 10.2.34.149	10.2.34.149
23	10.2.34.150/32	10.2.34.150 – 10.2.34.150	10.2.34.150
24	10.2.34.151/32	10.2.34.151 – 10.2.34.151	10.2.34.151
25	10.2.34.152/32	10.2.34.152 – 10.2.34.152	10.2.34.152
26	10.2.34.153/32	10.2.34.153 – 10.2.34.153	10.2.34.153
27	10.2.34.154/32	10.2.34.154 – 10.2.34.154	10.2.34.154
28	10.2.34.155/32	10.2.34.155 – 10.2.34.155	10.2.34.155
29	10.2.34.156/32	10.2.34.156 – 10.2.34.156	10.2.34.156
30	10.2.34.157/32	10.2.34.157 – 10.2.34.157	10.2.34.157
31	10.2.34.158/32	10.2.34.158 – 10.2.34.158	10.2.34.158
32	10.2.34.159/32	10.2.34.159 – 10.2.34.159	10.2.34.159
33	10.2.34.160/32	10.2.34.160 – 10.2.34.160	10.2.34.160
34	10.2.34.161/32	10.2.34.161 – 10.2.34.161	10.2.34.161
35	10.2.34.162/32	10.2.34.162 – 10.2.34.162	10.2.34.162
36	10.2.34.163/32	10.2.34.163 – 10.2.34.163	10.2.34.163
37	10.2.34.164/32	10.2.34.164 – 10.2.34.164	10.2.34.164
38	10.2.34.165/32	10.2.34.165 – 10.2.34.165	10.2.34.165
39	10.2.34.166/32	10.2.34.166 – 10.2.34.166	10.2.34.166
40	10.2.34.167/32	10.2.34.167 – 10.2.34.167	10.2.34.167
41	10.2.34.168/32	10.2.34.168 – 10.2.34.168	10.2.34.168
42	10.2.34.169/32	10.2.34.169 – 10.2.34.169	10.2.34.169
43	10.2.34.170/32	10.2.34.170 – 10.2.34.170	10.2.34.170
44	10.2.34.171/32	10.2.34.171 – 10.2.34.171	10.2.34.171
45	10.2.34.172/32	10.2.34.172 – 10.2.34.172	10.2.34.172
46	10.2.34.173/32	10.2.34.173 – 10.2.34.173	10.2.34.173
47	10.2.34.174/32	10.2.34.174 – 10.2.34.174	10.2.34.174
48	10.2.34.175/32	10.2.34.175 – 10.2.34.175	10.2.34.175
49	10.2.34.176/32	10.2.34.176 – 10.2.34.176	10.2.34.176
50	10.2.34.177/32	10.2.34.177 – 10.2.34.177	10.2.34.177
51	10.2.34.178/32	10.2.34.178 – 10.2.34.178	10.2.34.178
52	10.2.34.179/32	10.2.34.179 – 10.2.34.179	10.2.34.179
53	10.2.34.180/32	10.2.34.180 – 10.2.34.180	10.2.34.180
54	10.2.34.181/32	10.2.34.181 – 10.2.34.181	10.2.34.181
55	10.2.34.182/32	10.2.34.182 – 10.2.34.182	10.2.34.182
56	10.2.34.183/32	10.2.34.183 – 10.2.34.183	10.2.34.183
57	10.2.34.184/32	10.2.34.184 – 10.2.34.184	10.2.34.184
58	10.2.34.185/32	10.2.34.185 – 10.2.34.185	10.2.34.185
59	10.2.34.186/32	10.2.34.186 – 10.2.34.186	10.2.34.186
60	10.2.34.187/32	10.2.34.187 – 10.2.34.187	10.2.34.187
61	10.2.34.188/32	10.2.34.188 – 10.2.34.188	10.2.34.188
62	10.2.34.189/32	10.2.34.189 – 10.2.34.189	10.2.34.189
63	10.2.34.190/32	10.2.34.190 – 10.2.34.190	10.2.34.190
64	10.2.34.191/32	10.2.34.191 – 10.2.34.191	10.2.34.191
65	10.2.34.192/32	10.2.34.192 – 10.2.34.192	10.2.34.192
66	10.2.34.193/32	10.2.34.193 – 10.2.34.193	10.2.34.193
67	10.2.34.194/32	10.2.34.194 – 10.2.34.194	10.2.34.194
68	10.2.34.195/32	10.2.34.195 – 10.2.34.195	10.2.34.195
69	10.2.34.196/32	10.2.34.196 – 10.2.34.196	10.2.34.196
70	10.2.34.197/32	10.2.34.197 – 10.2.34.197	10.2.34.197
71	10.2.34.198/32	10.2.34.198 – 10.2.34.198	10.2.34.198
72	10.2.34.199/32	10.2.34.199 – 10.2.34.199	10.2.34.199
73	10.2.34.200/32	10.2.34.200 – 10.2.34.200	10.2.34.200
74	10.2.34.201/32	10.2.34.201 – 10.2.34.201	10.2.34.201
75	10.2.34.202/32	10.2.34.202 – 10.2.34.202	10.2.34.202
76	10.2.34.203/32	10.2.34.203 – 10.2.34.203	10.2.34.203
77	10.2.34.204/32	10.2.34.204 – 10.2.34.204	10.2.34.204
78	10.2.34.205/32	10.2.34.205 – 10.2.34.205	10.2.34.205
79	10.2.34.206/32	10.2.34.206 – 10.2.34.206	10.2.34.206
80	10.2.34.207/32	10.2.34.207 – 10.2.34.207	10.2.34.207
81	10.2.34.208/32	10.2.34.208 – 10.2.34.208	10.2.34.208
82	10.2.34.209/32	10.2.34.209 – 10.2.34.209	10.2.34.209
83	10.2.34.210/32	10.2.34.210 – 10.2.34.210	10.2.34.210
84	10.2.34.211/32	10.2.34.211 – 10.2.34.211	10.2.34.211
85	10.2.34.212/32	10.2.34.212 – 10.2.34.212	10.2.34.212
86	10.2.34.213/32	10.2.34.213 – 10.2.34.213	10.2.34.213
87	10.2.34.214/32	10.2.34.214 – 10.2.34.214	10.2.34.214
88	10.2.34.215/32	10.2.34.215 – 10.2.34.215	10.2.34.215
89	10.2.34.216/32	10.2.34.216 – 10.2.34.216	10.2.34.216
90	10.2.34.217/32	10.2.34.217 – 10.2.34.217	10.2.34.217
91	10.2.34.218/32	10.2.34.218 – 10.2.34.218	10.2.34.218
92	10.2.34.219/32	10.2.34.219 – 10.2.34.219	10.2.34.219
93	10.2.34.220/32	10.2.34.220 – 10.2.34.220	10.2.34.220
94	10.2.34.221/32	10.2.34.221 – 10.2.34.221	10.2.34.221
95	10.2.34.222/32	10.2.34.222 – 10.2.34.222	10.2.34.222
96	10.2.34.223/32	10.2.34.223 – 10.2.34.223	10.2.34.223
97	10.2.34.224/32	10.2.34.224 – 10.2.34.224	10.2.34.224
98	10.2.34.225/32	10.2.34.225 – 10.2.34.225	10.2.34.225
99	10.2.34.226/32	10.2.34.226 – 10.2.34.226	10.2.34.226
100	10.2.34.227/32	10.2.34.227 – 10.2.34.227	10.2.34.227
101	10.2.34.228/32	10.2.34.228 – 10.2.34.228	10.2.34.228
102	10.2.34.229/32	10.2.34.229 – 10.2.34.229	10.2.34.229
103	10.2.34.230/32	10.2.34.230 – 10.2.34.230	10.2.34.230
104	10.2.34.231/32	10.2.34.231 – 10.2.34.231	10.2.34.231
105	10.2.34.232/32	10.2.34.232 – 10.2.34.232	10.2.34.232
106	10.2.34.233/32	10.2.34.233 – 10.2.34.233	10.2.34.233
107	10.2.34.234/32	10.2.34.234 – 10.2.34.234	10.2.34.234
108	10.2.34.235/32	10.2.34.235 – 10.2.34.235	10.2.34.235
109	10.2.34.236/32	10.2.34.236 – 10.2.34.236	10.2.34.236
110	10.2.34.237/32	10.2.34.237 – 10.2.34.237	10.2.34.237
111	10.2.34.238/32	10.2.34.238 – 10.2.34.238	10.2.34.238
112	10.2.34.239/32	10.2.34.239 – 10.2.34.239	10.2.34.239
113	10.2.34.240/32	10.2.34.240 – 10.2.34.240	10.2.34.240
114	10.2.34.241/32	10.2.34.241 – 10.2.34.241	10.2.34.241
115	10.2.34.242/32	10.2.34.242 – 10.2.34.242	10.2.34.242
116	10.2.34.243/32	10.2.34.243 – 10.2.34.243	10.2.34.243
117	10.2.34.244/32	10.2.34.244 – 10.2.34.244	10.2.34.244
118	10.2.34.245/32	10.2.34.245 – 10.2.34.245	10.2.34.245
119	10.2.34.246/32	10.2.34.246 – 10.2.34.246	10.2.34.246
120	10.2.34.247/32	10.2.34.247 – 10.2.34.247	10.2.34.247
121	10.2.34.248/32	10.2.34.248 – 10.2.34.248	10.2.34.248
122	10.2.34.249/32	10.2.34.249 – 10.2.34.249	10.2.34.249
123	10.2.34.250/32	10.2.34.250 – 10.2.34.250	10.2.34.250
124	10.2.34.251/32	10.2.34.251 – 10.2.34.251	10.2.34.251
125	10.2.34.252/32	10.2.34.252 – 10.2.34.252	10.2.34.252
126	10.2.34.253/32	10.2.34.253 – 10.2.34.253	10.2.34.253
127	10.2.34.254/32	10.2.34.254 – 10.2.34.254	10.2.34.254
128	10.2.34.255/32	10.2.34.255 – 10.2.34.255	10.2.34.255

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 →