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)10.2.68.128/25

network10.2.68.128/25

broadcast10.2.68.255

first host10.2.68.129

last host10.2.68.254

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.2.68.128/25

address00001010.00000010.01000100.10000000

subnet mask11111111.11111111.11111111.10000000

network00001010.00000010.01000100.10000000

broadcast00001010.00000010.01000100.11111111

green = network part, grey = host part

hex0x0a024480

decimal167920768

reverse dns128.68.2.10.in-addr.arpa

ipv4-mapped::ffff:a02:4480

/25 split into /32 · 128 subnets

close ×

#	network	host range	broadcast
1	10.2.68.128/32	10.2.68.128 – 10.2.68.128	10.2.68.128
2	10.2.68.129/32	10.2.68.129 – 10.2.68.129	10.2.68.129
3	10.2.68.130/32	10.2.68.130 – 10.2.68.130	10.2.68.130
4	10.2.68.131/32	10.2.68.131 – 10.2.68.131	10.2.68.131
5	10.2.68.132/32	10.2.68.132 – 10.2.68.132	10.2.68.132
6	10.2.68.133/32	10.2.68.133 – 10.2.68.133	10.2.68.133
7	10.2.68.134/32	10.2.68.134 – 10.2.68.134	10.2.68.134
8	10.2.68.135/32	10.2.68.135 – 10.2.68.135	10.2.68.135
9	10.2.68.136/32	10.2.68.136 – 10.2.68.136	10.2.68.136
10	10.2.68.137/32	10.2.68.137 – 10.2.68.137	10.2.68.137
11	10.2.68.138/32	10.2.68.138 – 10.2.68.138	10.2.68.138
12	10.2.68.139/32	10.2.68.139 – 10.2.68.139	10.2.68.139
13	10.2.68.140/32	10.2.68.140 – 10.2.68.140	10.2.68.140
14	10.2.68.141/32	10.2.68.141 – 10.2.68.141	10.2.68.141
15	10.2.68.142/32	10.2.68.142 – 10.2.68.142	10.2.68.142
16	10.2.68.143/32	10.2.68.143 – 10.2.68.143	10.2.68.143
17	10.2.68.144/32	10.2.68.144 – 10.2.68.144	10.2.68.144
18	10.2.68.145/32	10.2.68.145 – 10.2.68.145	10.2.68.145
19	10.2.68.146/32	10.2.68.146 – 10.2.68.146	10.2.68.146
20	10.2.68.147/32	10.2.68.147 – 10.2.68.147	10.2.68.147
21	10.2.68.148/32	10.2.68.148 – 10.2.68.148	10.2.68.148
22	10.2.68.149/32	10.2.68.149 – 10.2.68.149	10.2.68.149
23	10.2.68.150/32	10.2.68.150 – 10.2.68.150	10.2.68.150
24	10.2.68.151/32	10.2.68.151 – 10.2.68.151	10.2.68.151
25	10.2.68.152/32	10.2.68.152 – 10.2.68.152	10.2.68.152
26	10.2.68.153/32	10.2.68.153 – 10.2.68.153	10.2.68.153
27	10.2.68.154/32	10.2.68.154 – 10.2.68.154	10.2.68.154
28	10.2.68.155/32	10.2.68.155 – 10.2.68.155	10.2.68.155
29	10.2.68.156/32	10.2.68.156 – 10.2.68.156	10.2.68.156
30	10.2.68.157/32	10.2.68.157 – 10.2.68.157	10.2.68.157
31	10.2.68.158/32	10.2.68.158 – 10.2.68.158	10.2.68.158
32	10.2.68.159/32	10.2.68.159 – 10.2.68.159	10.2.68.159
33	10.2.68.160/32	10.2.68.160 – 10.2.68.160	10.2.68.160
34	10.2.68.161/32	10.2.68.161 – 10.2.68.161	10.2.68.161
35	10.2.68.162/32	10.2.68.162 – 10.2.68.162	10.2.68.162
36	10.2.68.163/32	10.2.68.163 – 10.2.68.163	10.2.68.163
37	10.2.68.164/32	10.2.68.164 – 10.2.68.164	10.2.68.164
38	10.2.68.165/32	10.2.68.165 – 10.2.68.165	10.2.68.165
39	10.2.68.166/32	10.2.68.166 – 10.2.68.166	10.2.68.166
40	10.2.68.167/32	10.2.68.167 – 10.2.68.167	10.2.68.167
41	10.2.68.168/32	10.2.68.168 – 10.2.68.168	10.2.68.168
42	10.2.68.169/32	10.2.68.169 – 10.2.68.169	10.2.68.169
43	10.2.68.170/32	10.2.68.170 – 10.2.68.170	10.2.68.170
44	10.2.68.171/32	10.2.68.171 – 10.2.68.171	10.2.68.171
45	10.2.68.172/32	10.2.68.172 – 10.2.68.172	10.2.68.172
46	10.2.68.173/32	10.2.68.173 – 10.2.68.173	10.2.68.173
47	10.2.68.174/32	10.2.68.174 – 10.2.68.174	10.2.68.174
48	10.2.68.175/32	10.2.68.175 – 10.2.68.175	10.2.68.175
49	10.2.68.176/32	10.2.68.176 – 10.2.68.176	10.2.68.176
50	10.2.68.177/32	10.2.68.177 – 10.2.68.177	10.2.68.177
51	10.2.68.178/32	10.2.68.178 – 10.2.68.178	10.2.68.178
52	10.2.68.179/32	10.2.68.179 – 10.2.68.179	10.2.68.179
53	10.2.68.180/32	10.2.68.180 – 10.2.68.180	10.2.68.180
54	10.2.68.181/32	10.2.68.181 – 10.2.68.181	10.2.68.181
55	10.2.68.182/32	10.2.68.182 – 10.2.68.182	10.2.68.182
56	10.2.68.183/32	10.2.68.183 – 10.2.68.183	10.2.68.183
57	10.2.68.184/32	10.2.68.184 – 10.2.68.184	10.2.68.184
58	10.2.68.185/32	10.2.68.185 – 10.2.68.185	10.2.68.185
59	10.2.68.186/32	10.2.68.186 – 10.2.68.186	10.2.68.186
60	10.2.68.187/32	10.2.68.187 – 10.2.68.187	10.2.68.187
61	10.2.68.188/32	10.2.68.188 – 10.2.68.188	10.2.68.188
62	10.2.68.189/32	10.2.68.189 – 10.2.68.189	10.2.68.189
63	10.2.68.190/32	10.2.68.190 – 10.2.68.190	10.2.68.190
64	10.2.68.191/32	10.2.68.191 – 10.2.68.191	10.2.68.191
65	10.2.68.192/32	10.2.68.192 – 10.2.68.192	10.2.68.192
66	10.2.68.193/32	10.2.68.193 – 10.2.68.193	10.2.68.193
67	10.2.68.194/32	10.2.68.194 – 10.2.68.194	10.2.68.194
68	10.2.68.195/32	10.2.68.195 – 10.2.68.195	10.2.68.195
69	10.2.68.196/32	10.2.68.196 – 10.2.68.196	10.2.68.196
70	10.2.68.197/32	10.2.68.197 – 10.2.68.197	10.2.68.197
71	10.2.68.198/32	10.2.68.198 – 10.2.68.198	10.2.68.198
72	10.2.68.199/32	10.2.68.199 – 10.2.68.199	10.2.68.199
73	10.2.68.200/32	10.2.68.200 – 10.2.68.200	10.2.68.200
74	10.2.68.201/32	10.2.68.201 – 10.2.68.201	10.2.68.201
75	10.2.68.202/32	10.2.68.202 – 10.2.68.202	10.2.68.202
76	10.2.68.203/32	10.2.68.203 – 10.2.68.203	10.2.68.203
77	10.2.68.204/32	10.2.68.204 – 10.2.68.204	10.2.68.204
78	10.2.68.205/32	10.2.68.205 – 10.2.68.205	10.2.68.205
79	10.2.68.206/32	10.2.68.206 – 10.2.68.206	10.2.68.206
80	10.2.68.207/32	10.2.68.207 – 10.2.68.207	10.2.68.207
81	10.2.68.208/32	10.2.68.208 – 10.2.68.208	10.2.68.208
82	10.2.68.209/32	10.2.68.209 – 10.2.68.209	10.2.68.209
83	10.2.68.210/32	10.2.68.210 – 10.2.68.210	10.2.68.210
84	10.2.68.211/32	10.2.68.211 – 10.2.68.211	10.2.68.211
85	10.2.68.212/32	10.2.68.212 – 10.2.68.212	10.2.68.212
86	10.2.68.213/32	10.2.68.213 – 10.2.68.213	10.2.68.213
87	10.2.68.214/32	10.2.68.214 – 10.2.68.214	10.2.68.214
88	10.2.68.215/32	10.2.68.215 – 10.2.68.215	10.2.68.215
89	10.2.68.216/32	10.2.68.216 – 10.2.68.216	10.2.68.216
90	10.2.68.217/32	10.2.68.217 – 10.2.68.217	10.2.68.217
91	10.2.68.218/32	10.2.68.218 – 10.2.68.218	10.2.68.218
92	10.2.68.219/32	10.2.68.219 – 10.2.68.219	10.2.68.219
93	10.2.68.220/32	10.2.68.220 – 10.2.68.220	10.2.68.220
94	10.2.68.221/32	10.2.68.221 – 10.2.68.221	10.2.68.221
95	10.2.68.222/32	10.2.68.222 – 10.2.68.222	10.2.68.222
96	10.2.68.223/32	10.2.68.223 – 10.2.68.223	10.2.68.223
97	10.2.68.224/32	10.2.68.224 – 10.2.68.224	10.2.68.224
98	10.2.68.225/32	10.2.68.225 – 10.2.68.225	10.2.68.225
99	10.2.68.226/32	10.2.68.226 – 10.2.68.226	10.2.68.226
100	10.2.68.227/32	10.2.68.227 – 10.2.68.227	10.2.68.227
101	10.2.68.228/32	10.2.68.228 – 10.2.68.228	10.2.68.228
102	10.2.68.229/32	10.2.68.229 – 10.2.68.229	10.2.68.229
103	10.2.68.230/32	10.2.68.230 – 10.2.68.230	10.2.68.230
104	10.2.68.231/32	10.2.68.231 – 10.2.68.231	10.2.68.231
105	10.2.68.232/32	10.2.68.232 – 10.2.68.232	10.2.68.232
106	10.2.68.233/32	10.2.68.233 – 10.2.68.233	10.2.68.233
107	10.2.68.234/32	10.2.68.234 – 10.2.68.234	10.2.68.234
108	10.2.68.235/32	10.2.68.235 – 10.2.68.235	10.2.68.235
109	10.2.68.236/32	10.2.68.236 – 10.2.68.236	10.2.68.236
110	10.2.68.237/32	10.2.68.237 – 10.2.68.237	10.2.68.237
111	10.2.68.238/32	10.2.68.238 – 10.2.68.238	10.2.68.238
112	10.2.68.239/32	10.2.68.239 – 10.2.68.239	10.2.68.239
113	10.2.68.240/32	10.2.68.240 – 10.2.68.240	10.2.68.240
114	10.2.68.241/32	10.2.68.241 – 10.2.68.241	10.2.68.241
115	10.2.68.242/32	10.2.68.242 – 10.2.68.242	10.2.68.242
116	10.2.68.243/32	10.2.68.243 – 10.2.68.243	10.2.68.243
117	10.2.68.244/32	10.2.68.244 – 10.2.68.244	10.2.68.244
118	10.2.68.245/32	10.2.68.245 – 10.2.68.245	10.2.68.245
119	10.2.68.246/32	10.2.68.246 – 10.2.68.246	10.2.68.246
120	10.2.68.247/32	10.2.68.247 – 10.2.68.247	10.2.68.247
121	10.2.68.248/32	10.2.68.248 – 10.2.68.248	10.2.68.248
122	10.2.68.249/32	10.2.68.249 – 10.2.68.249	10.2.68.249
123	10.2.68.250/32	10.2.68.250 – 10.2.68.250	10.2.68.250
124	10.2.68.251/32	10.2.68.251 – 10.2.68.251	10.2.68.251
125	10.2.68.252/32	10.2.68.252 – 10.2.68.252	10.2.68.252
126	10.2.68.253/32	10.2.68.253 – 10.2.68.253	10.2.68.253
127	10.2.68.254/32	10.2.68.254 – 10.2.68.254	10.2.68.254
128	10.2.68.255/32	10.2.68.255 – 10.2.68.255	10.2.68.255

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 →