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)10.0.85.128/25

network10.0.85.128/25

broadcast10.0.85.255

first host10.0.85.129

last host10.0.85.254

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.0.85.128/25

address00001010.00000000.01010101.10000000

subnet mask11111111.11111111.11111111.10000000

network00001010.00000000.01010101.10000000

broadcast00001010.00000000.01010101.11111111

green = network part, grey = host part

hex0x0a005580

decimal167794048

reverse dns128.85.0.10.in-addr.arpa

ipv4-mapped::ffff:a00:5580

/25 split into /32 · 128 subnets

close ×

#	network	host range	broadcast
1	10.0.85.128/32	10.0.85.128 – 10.0.85.128	10.0.85.128
2	10.0.85.129/32	10.0.85.129 – 10.0.85.129	10.0.85.129
3	10.0.85.130/32	10.0.85.130 – 10.0.85.130	10.0.85.130
4	10.0.85.131/32	10.0.85.131 – 10.0.85.131	10.0.85.131
5	10.0.85.132/32	10.0.85.132 – 10.0.85.132	10.0.85.132
6	10.0.85.133/32	10.0.85.133 – 10.0.85.133	10.0.85.133
7	10.0.85.134/32	10.0.85.134 – 10.0.85.134	10.0.85.134
8	10.0.85.135/32	10.0.85.135 – 10.0.85.135	10.0.85.135
9	10.0.85.136/32	10.0.85.136 – 10.0.85.136	10.0.85.136
10	10.0.85.137/32	10.0.85.137 – 10.0.85.137	10.0.85.137
11	10.0.85.138/32	10.0.85.138 – 10.0.85.138	10.0.85.138
12	10.0.85.139/32	10.0.85.139 – 10.0.85.139	10.0.85.139
13	10.0.85.140/32	10.0.85.140 – 10.0.85.140	10.0.85.140
14	10.0.85.141/32	10.0.85.141 – 10.0.85.141	10.0.85.141
15	10.0.85.142/32	10.0.85.142 – 10.0.85.142	10.0.85.142
16	10.0.85.143/32	10.0.85.143 – 10.0.85.143	10.0.85.143
17	10.0.85.144/32	10.0.85.144 – 10.0.85.144	10.0.85.144
18	10.0.85.145/32	10.0.85.145 – 10.0.85.145	10.0.85.145
19	10.0.85.146/32	10.0.85.146 – 10.0.85.146	10.0.85.146
20	10.0.85.147/32	10.0.85.147 – 10.0.85.147	10.0.85.147
21	10.0.85.148/32	10.0.85.148 – 10.0.85.148	10.0.85.148
22	10.0.85.149/32	10.0.85.149 – 10.0.85.149	10.0.85.149
23	10.0.85.150/32	10.0.85.150 – 10.0.85.150	10.0.85.150
24	10.0.85.151/32	10.0.85.151 – 10.0.85.151	10.0.85.151
25	10.0.85.152/32	10.0.85.152 – 10.0.85.152	10.0.85.152
26	10.0.85.153/32	10.0.85.153 – 10.0.85.153	10.0.85.153
27	10.0.85.154/32	10.0.85.154 – 10.0.85.154	10.0.85.154
28	10.0.85.155/32	10.0.85.155 – 10.0.85.155	10.0.85.155
29	10.0.85.156/32	10.0.85.156 – 10.0.85.156	10.0.85.156
30	10.0.85.157/32	10.0.85.157 – 10.0.85.157	10.0.85.157
31	10.0.85.158/32	10.0.85.158 – 10.0.85.158	10.0.85.158
32	10.0.85.159/32	10.0.85.159 – 10.0.85.159	10.0.85.159
33	10.0.85.160/32	10.0.85.160 – 10.0.85.160	10.0.85.160
34	10.0.85.161/32	10.0.85.161 – 10.0.85.161	10.0.85.161
35	10.0.85.162/32	10.0.85.162 – 10.0.85.162	10.0.85.162
36	10.0.85.163/32	10.0.85.163 – 10.0.85.163	10.0.85.163
37	10.0.85.164/32	10.0.85.164 – 10.0.85.164	10.0.85.164
38	10.0.85.165/32	10.0.85.165 – 10.0.85.165	10.0.85.165
39	10.0.85.166/32	10.0.85.166 – 10.0.85.166	10.0.85.166
40	10.0.85.167/32	10.0.85.167 – 10.0.85.167	10.0.85.167
41	10.0.85.168/32	10.0.85.168 – 10.0.85.168	10.0.85.168
42	10.0.85.169/32	10.0.85.169 – 10.0.85.169	10.0.85.169
43	10.0.85.170/32	10.0.85.170 – 10.0.85.170	10.0.85.170
44	10.0.85.171/32	10.0.85.171 – 10.0.85.171	10.0.85.171
45	10.0.85.172/32	10.0.85.172 – 10.0.85.172	10.0.85.172
46	10.0.85.173/32	10.0.85.173 – 10.0.85.173	10.0.85.173
47	10.0.85.174/32	10.0.85.174 – 10.0.85.174	10.0.85.174
48	10.0.85.175/32	10.0.85.175 – 10.0.85.175	10.0.85.175
49	10.0.85.176/32	10.0.85.176 – 10.0.85.176	10.0.85.176
50	10.0.85.177/32	10.0.85.177 – 10.0.85.177	10.0.85.177
51	10.0.85.178/32	10.0.85.178 – 10.0.85.178	10.0.85.178
52	10.0.85.179/32	10.0.85.179 – 10.0.85.179	10.0.85.179
53	10.0.85.180/32	10.0.85.180 – 10.0.85.180	10.0.85.180
54	10.0.85.181/32	10.0.85.181 – 10.0.85.181	10.0.85.181
55	10.0.85.182/32	10.0.85.182 – 10.0.85.182	10.0.85.182
56	10.0.85.183/32	10.0.85.183 – 10.0.85.183	10.0.85.183
57	10.0.85.184/32	10.0.85.184 – 10.0.85.184	10.0.85.184
58	10.0.85.185/32	10.0.85.185 – 10.0.85.185	10.0.85.185
59	10.0.85.186/32	10.0.85.186 – 10.0.85.186	10.0.85.186
60	10.0.85.187/32	10.0.85.187 – 10.0.85.187	10.0.85.187
61	10.0.85.188/32	10.0.85.188 – 10.0.85.188	10.0.85.188
62	10.0.85.189/32	10.0.85.189 – 10.0.85.189	10.0.85.189
63	10.0.85.190/32	10.0.85.190 – 10.0.85.190	10.0.85.190
64	10.0.85.191/32	10.0.85.191 – 10.0.85.191	10.0.85.191
65	10.0.85.192/32	10.0.85.192 – 10.0.85.192	10.0.85.192
66	10.0.85.193/32	10.0.85.193 – 10.0.85.193	10.0.85.193
67	10.0.85.194/32	10.0.85.194 – 10.0.85.194	10.0.85.194
68	10.0.85.195/32	10.0.85.195 – 10.0.85.195	10.0.85.195
69	10.0.85.196/32	10.0.85.196 – 10.0.85.196	10.0.85.196
70	10.0.85.197/32	10.0.85.197 – 10.0.85.197	10.0.85.197
71	10.0.85.198/32	10.0.85.198 – 10.0.85.198	10.0.85.198
72	10.0.85.199/32	10.0.85.199 – 10.0.85.199	10.0.85.199
73	10.0.85.200/32	10.0.85.200 – 10.0.85.200	10.0.85.200
74	10.0.85.201/32	10.0.85.201 – 10.0.85.201	10.0.85.201
75	10.0.85.202/32	10.0.85.202 – 10.0.85.202	10.0.85.202
76	10.0.85.203/32	10.0.85.203 – 10.0.85.203	10.0.85.203
77	10.0.85.204/32	10.0.85.204 – 10.0.85.204	10.0.85.204
78	10.0.85.205/32	10.0.85.205 – 10.0.85.205	10.0.85.205
79	10.0.85.206/32	10.0.85.206 – 10.0.85.206	10.0.85.206
80	10.0.85.207/32	10.0.85.207 – 10.0.85.207	10.0.85.207
81	10.0.85.208/32	10.0.85.208 – 10.0.85.208	10.0.85.208
82	10.0.85.209/32	10.0.85.209 – 10.0.85.209	10.0.85.209
83	10.0.85.210/32	10.0.85.210 – 10.0.85.210	10.0.85.210
84	10.0.85.211/32	10.0.85.211 – 10.0.85.211	10.0.85.211
85	10.0.85.212/32	10.0.85.212 – 10.0.85.212	10.0.85.212
86	10.0.85.213/32	10.0.85.213 – 10.0.85.213	10.0.85.213
87	10.0.85.214/32	10.0.85.214 – 10.0.85.214	10.0.85.214
88	10.0.85.215/32	10.0.85.215 – 10.0.85.215	10.0.85.215
89	10.0.85.216/32	10.0.85.216 – 10.0.85.216	10.0.85.216
90	10.0.85.217/32	10.0.85.217 – 10.0.85.217	10.0.85.217
91	10.0.85.218/32	10.0.85.218 – 10.0.85.218	10.0.85.218
92	10.0.85.219/32	10.0.85.219 – 10.0.85.219	10.0.85.219
93	10.0.85.220/32	10.0.85.220 – 10.0.85.220	10.0.85.220
94	10.0.85.221/32	10.0.85.221 – 10.0.85.221	10.0.85.221
95	10.0.85.222/32	10.0.85.222 – 10.0.85.222	10.0.85.222
96	10.0.85.223/32	10.0.85.223 – 10.0.85.223	10.0.85.223
97	10.0.85.224/32	10.0.85.224 – 10.0.85.224	10.0.85.224
98	10.0.85.225/32	10.0.85.225 – 10.0.85.225	10.0.85.225
99	10.0.85.226/32	10.0.85.226 – 10.0.85.226	10.0.85.226
100	10.0.85.227/32	10.0.85.227 – 10.0.85.227	10.0.85.227
101	10.0.85.228/32	10.0.85.228 – 10.0.85.228	10.0.85.228
102	10.0.85.229/32	10.0.85.229 – 10.0.85.229	10.0.85.229
103	10.0.85.230/32	10.0.85.230 – 10.0.85.230	10.0.85.230
104	10.0.85.231/32	10.0.85.231 – 10.0.85.231	10.0.85.231
105	10.0.85.232/32	10.0.85.232 – 10.0.85.232	10.0.85.232
106	10.0.85.233/32	10.0.85.233 – 10.0.85.233	10.0.85.233
107	10.0.85.234/32	10.0.85.234 – 10.0.85.234	10.0.85.234
108	10.0.85.235/32	10.0.85.235 – 10.0.85.235	10.0.85.235
109	10.0.85.236/32	10.0.85.236 – 10.0.85.236	10.0.85.236
110	10.0.85.237/32	10.0.85.237 – 10.0.85.237	10.0.85.237
111	10.0.85.238/32	10.0.85.238 – 10.0.85.238	10.0.85.238
112	10.0.85.239/32	10.0.85.239 – 10.0.85.239	10.0.85.239
113	10.0.85.240/32	10.0.85.240 – 10.0.85.240	10.0.85.240
114	10.0.85.241/32	10.0.85.241 – 10.0.85.241	10.0.85.241
115	10.0.85.242/32	10.0.85.242 – 10.0.85.242	10.0.85.242
116	10.0.85.243/32	10.0.85.243 – 10.0.85.243	10.0.85.243
117	10.0.85.244/32	10.0.85.244 – 10.0.85.244	10.0.85.244
118	10.0.85.245/32	10.0.85.245 – 10.0.85.245	10.0.85.245
119	10.0.85.246/32	10.0.85.246 – 10.0.85.246	10.0.85.246
120	10.0.85.247/32	10.0.85.247 – 10.0.85.247	10.0.85.247
121	10.0.85.248/32	10.0.85.248 – 10.0.85.248	10.0.85.248
122	10.0.85.249/32	10.0.85.249 – 10.0.85.249	10.0.85.249
123	10.0.85.250/32	10.0.85.250 – 10.0.85.250	10.0.85.250
124	10.0.85.251/32	10.0.85.251 – 10.0.85.251	10.0.85.251
125	10.0.85.252/32	10.0.85.252 – 10.0.85.252	10.0.85.252
126	10.0.85.253/32	10.0.85.253 – 10.0.85.253	10.0.85.253
127	10.0.85.254/32	10.0.85.254 – 10.0.85.254	10.0.85.254
128	10.0.85.255/32	10.0.85.255 – 10.0.85.255	10.0.85.255

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 →