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)10.2.80.128/25

network10.2.80.128/25

broadcast10.2.80.255

first host10.2.80.129

last host10.2.80.254

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.2.80.128/25

address00001010.00000010.01010000.10000000

subnet mask11111111.11111111.11111111.10000000

network00001010.00000010.01010000.10000000

broadcast00001010.00000010.01010000.11111111

green = network part, grey = host part

hex0x0a025080

decimal167923840

reverse dns128.80.2.10.in-addr.arpa

ipv4-mapped::ffff:a02:5080

/25 split into /32 · 128 subnets

close ×

#	network	host range	broadcast
1	10.2.80.128/32	10.2.80.128 – 10.2.80.128	10.2.80.128
2	10.2.80.129/32	10.2.80.129 – 10.2.80.129	10.2.80.129
3	10.2.80.130/32	10.2.80.130 – 10.2.80.130	10.2.80.130
4	10.2.80.131/32	10.2.80.131 – 10.2.80.131	10.2.80.131
5	10.2.80.132/32	10.2.80.132 – 10.2.80.132	10.2.80.132
6	10.2.80.133/32	10.2.80.133 – 10.2.80.133	10.2.80.133
7	10.2.80.134/32	10.2.80.134 – 10.2.80.134	10.2.80.134
8	10.2.80.135/32	10.2.80.135 – 10.2.80.135	10.2.80.135
9	10.2.80.136/32	10.2.80.136 – 10.2.80.136	10.2.80.136
10	10.2.80.137/32	10.2.80.137 – 10.2.80.137	10.2.80.137
11	10.2.80.138/32	10.2.80.138 – 10.2.80.138	10.2.80.138
12	10.2.80.139/32	10.2.80.139 – 10.2.80.139	10.2.80.139
13	10.2.80.140/32	10.2.80.140 – 10.2.80.140	10.2.80.140
14	10.2.80.141/32	10.2.80.141 – 10.2.80.141	10.2.80.141
15	10.2.80.142/32	10.2.80.142 – 10.2.80.142	10.2.80.142
16	10.2.80.143/32	10.2.80.143 – 10.2.80.143	10.2.80.143
17	10.2.80.144/32	10.2.80.144 – 10.2.80.144	10.2.80.144
18	10.2.80.145/32	10.2.80.145 – 10.2.80.145	10.2.80.145
19	10.2.80.146/32	10.2.80.146 – 10.2.80.146	10.2.80.146
20	10.2.80.147/32	10.2.80.147 – 10.2.80.147	10.2.80.147
21	10.2.80.148/32	10.2.80.148 – 10.2.80.148	10.2.80.148
22	10.2.80.149/32	10.2.80.149 – 10.2.80.149	10.2.80.149
23	10.2.80.150/32	10.2.80.150 – 10.2.80.150	10.2.80.150
24	10.2.80.151/32	10.2.80.151 – 10.2.80.151	10.2.80.151
25	10.2.80.152/32	10.2.80.152 – 10.2.80.152	10.2.80.152
26	10.2.80.153/32	10.2.80.153 – 10.2.80.153	10.2.80.153
27	10.2.80.154/32	10.2.80.154 – 10.2.80.154	10.2.80.154
28	10.2.80.155/32	10.2.80.155 – 10.2.80.155	10.2.80.155
29	10.2.80.156/32	10.2.80.156 – 10.2.80.156	10.2.80.156
30	10.2.80.157/32	10.2.80.157 – 10.2.80.157	10.2.80.157
31	10.2.80.158/32	10.2.80.158 – 10.2.80.158	10.2.80.158
32	10.2.80.159/32	10.2.80.159 – 10.2.80.159	10.2.80.159
33	10.2.80.160/32	10.2.80.160 – 10.2.80.160	10.2.80.160
34	10.2.80.161/32	10.2.80.161 – 10.2.80.161	10.2.80.161
35	10.2.80.162/32	10.2.80.162 – 10.2.80.162	10.2.80.162
36	10.2.80.163/32	10.2.80.163 – 10.2.80.163	10.2.80.163
37	10.2.80.164/32	10.2.80.164 – 10.2.80.164	10.2.80.164
38	10.2.80.165/32	10.2.80.165 – 10.2.80.165	10.2.80.165
39	10.2.80.166/32	10.2.80.166 – 10.2.80.166	10.2.80.166
40	10.2.80.167/32	10.2.80.167 – 10.2.80.167	10.2.80.167
41	10.2.80.168/32	10.2.80.168 – 10.2.80.168	10.2.80.168
42	10.2.80.169/32	10.2.80.169 – 10.2.80.169	10.2.80.169
43	10.2.80.170/32	10.2.80.170 – 10.2.80.170	10.2.80.170
44	10.2.80.171/32	10.2.80.171 – 10.2.80.171	10.2.80.171
45	10.2.80.172/32	10.2.80.172 – 10.2.80.172	10.2.80.172
46	10.2.80.173/32	10.2.80.173 – 10.2.80.173	10.2.80.173
47	10.2.80.174/32	10.2.80.174 – 10.2.80.174	10.2.80.174
48	10.2.80.175/32	10.2.80.175 – 10.2.80.175	10.2.80.175
49	10.2.80.176/32	10.2.80.176 – 10.2.80.176	10.2.80.176
50	10.2.80.177/32	10.2.80.177 – 10.2.80.177	10.2.80.177
51	10.2.80.178/32	10.2.80.178 – 10.2.80.178	10.2.80.178
52	10.2.80.179/32	10.2.80.179 – 10.2.80.179	10.2.80.179
53	10.2.80.180/32	10.2.80.180 – 10.2.80.180	10.2.80.180
54	10.2.80.181/32	10.2.80.181 – 10.2.80.181	10.2.80.181
55	10.2.80.182/32	10.2.80.182 – 10.2.80.182	10.2.80.182
56	10.2.80.183/32	10.2.80.183 – 10.2.80.183	10.2.80.183
57	10.2.80.184/32	10.2.80.184 – 10.2.80.184	10.2.80.184
58	10.2.80.185/32	10.2.80.185 – 10.2.80.185	10.2.80.185
59	10.2.80.186/32	10.2.80.186 – 10.2.80.186	10.2.80.186
60	10.2.80.187/32	10.2.80.187 – 10.2.80.187	10.2.80.187
61	10.2.80.188/32	10.2.80.188 – 10.2.80.188	10.2.80.188
62	10.2.80.189/32	10.2.80.189 – 10.2.80.189	10.2.80.189
63	10.2.80.190/32	10.2.80.190 – 10.2.80.190	10.2.80.190
64	10.2.80.191/32	10.2.80.191 – 10.2.80.191	10.2.80.191
65	10.2.80.192/32	10.2.80.192 – 10.2.80.192	10.2.80.192
66	10.2.80.193/32	10.2.80.193 – 10.2.80.193	10.2.80.193
67	10.2.80.194/32	10.2.80.194 – 10.2.80.194	10.2.80.194
68	10.2.80.195/32	10.2.80.195 – 10.2.80.195	10.2.80.195
69	10.2.80.196/32	10.2.80.196 – 10.2.80.196	10.2.80.196
70	10.2.80.197/32	10.2.80.197 – 10.2.80.197	10.2.80.197
71	10.2.80.198/32	10.2.80.198 – 10.2.80.198	10.2.80.198
72	10.2.80.199/32	10.2.80.199 – 10.2.80.199	10.2.80.199
73	10.2.80.200/32	10.2.80.200 – 10.2.80.200	10.2.80.200
74	10.2.80.201/32	10.2.80.201 – 10.2.80.201	10.2.80.201
75	10.2.80.202/32	10.2.80.202 – 10.2.80.202	10.2.80.202
76	10.2.80.203/32	10.2.80.203 – 10.2.80.203	10.2.80.203
77	10.2.80.204/32	10.2.80.204 – 10.2.80.204	10.2.80.204
78	10.2.80.205/32	10.2.80.205 – 10.2.80.205	10.2.80.205
79	10.2.80.206/32	10.2.80.206 – 10.2.80.206	10.2.80.206
80	10.2.80.207/32	10.2.80.207 – 10.2.80.207	10.2.80.207
81	10.2.80.208/32	10.2.80.208 – 10.2.80.208	10.2.80.208
82	10.2.80.209/32	10.2.80.209 – 10.2.80.209	10.2.80.209
83	10.2.80.210/32	10.2.80.210 – 10.2.80.210	10.2.80.210
84	10.2.80.211/32	10.2.80.211 – 10.2.80.211	10.2.80.211
85	10.2.80.212/32	10.2.80.212 – 10.2.80.212	10.2.80.212
86	10.2.80.213/32	10.2.80.213 – 10.2.80.213	10.2.80.213
87	10.2.80.214/32	10.2.80.214 – 10.2.80.214	10.2.80.214
88	10.2.80.215/32	10.2.80.215 – 10.2.80.215	10.2.80.215
89	10.2.80.216/32	10.2.80.216 – 10.2.80.216	10.2.80.216
90	10.2.80.217/32	10.2.80.217 – 10.2.80.217	10.2.80.217
91	10.2.80.218/32	10.2.80.218 – 10.2.80.218	10.2.80.218
92	10.2.80.219/32	10.2.80.219 – 10.2.80.219	10.2.80.219
93	10.2.80.220/32	10.2.80.220 – 10.2.80.220	10.2.80.220
94	10.2.80.221/32	10.2.80.221 – 10.2.80.221	10.2.80.221
95	10.2.80.222/32	10.2.80.222 – 10.2.80.222	10.2.80.222
96	10.2.80.223/32	10.2.80.223 – 10.2.80.223	10.2.80.223
97	10.2.80.224/32	10.2.80.224 – 10.2.80.224	10.2.80.224
98	10.2.80.225/32	10.2.80.225 – 10.2.80.225	10.2.80.225
99	10.2.80.226/32	10.2.80.226 – 10.2.80.226	10.2.80.226
100	10.2.80.227/32	10.2.80.227 – 10.2.80.227	10.2.80.227
101	10.2.80.228/32	10.2.80.228 – 10.2.80.228	10.2.80.228
102	10.2.80.229/32	10.2.80.229 – 10.2.80.229	10.2.80.229
103	10.2.80.230/32	10.2.80.230 – 10.2.80.230	10.2.80.230
104	10.2.80.231/32	10.2.80.231 – 10.2.80.231	10.2.80.231
105	10.2.80.232/32	10.2.80.232 – 10.2.80.232	10.2.80.232
106	10.2.80.233/32	10.2.80.233 – 10.2.80.233	10.2.80.233
107	10.2.80.234/32	10.2.80.234 – 10.2.80.234	10.2.80.234
108	10.2.80.235/32	10.2.80.235 – 10.2.80.235	10.2.80.235
109	10.2.80.236/32	10.2.80.236 – 10.2.80.236	10.2.80.236
110	10.2.80.237/32	10.2.80.237 – 10.2.80.237	10.2.80.237
111	10.2.80.238/32	10.2.80.238 – 10.2.80.238	10.2.80.238
112	10.2.80.239/32	10.2.80.239 – 10.2.80.239	10.2.80.239
113	10.2.80.240/32	10.2.80.240 – 10.2.80.240	10.2.80.240
114	10.2.80.241/32	10.2.80.241 – 10.2.80.241	10.2.80.241
115	10.2.80.242/32	10.2.80.242 – 10.2.80.242	10.2.80.242
116	10.2.80.243/32	10.2.80.243 – 10.2.80.243	10.2.80.243
117	10.2.80.244/32	10.2.80.244 – 10.2.80.244	10.2.80.244
118	10.2.80.245/32	10.2.80.245 – 10.2.80.245	10.2.80.245
119	10.2.80.246/32	10.2.80.246 – 10.2.80.246	10.2.80.246
120	10.2.80.247/32	10.2.80.247 – 10.2.80.247	10.2.80.247
121	10.2.80.248/32	10.2.80.248 – 10.2.80.248	10.2.80.248
122	10.2.80.249/32	10.2.80.249 – 10.2.80.249	10.2.80.249
123	10.2.80.250/32	10.2.80.250 – 10.2.80.250	10.2.80.250
124	10.2.80.251/32	10.2.80.251 – 10.2.80.251	10.2.80.251
125	10.2.80.252/32	10.2.80.252 – 10.2.80.252	10.2.80.252
126	10.2.80.253/32	10.2.80.253 – 10.2.80.253	10.2.80.253
127	10.2.80.254/32	10.2.80.254 – 10.2.80.254	10.2.80.254
128	10.2.80.255/32	10.2.80.255 – 10.2.80.255	10.2.80.255

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 →