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)10.167.127.128/25

network10.167.127.128/25

broadcast10.167.127.255

first host10.167.127.129

last host10.167.127.254

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.167.127.128/25

address00001010.10100111.01111111.10000000

subnet mask11111111.11111111.11111111.10000000

network00001010.10100111.01111111.10000000

broadcast00001010.10100111.01111111.11111111

green = network part, grey = host part

hex0x0aa77f80

decimal178749312

reverse dns128.127.167.10.in-addr.arpa

ipv4-mapped::ffff:aa7:7f80

/25 split into /32 · 128 subnets

close ×

#	network	host range	broadcast
1	10.167.127.128/32	10.167.127.128 – 10.167.127.128	10.167.127.128
2	10.167.127.129/32	10.167.127.129 – 10.167.127.129	10.167.127.129
3	10.167.127.130/32	10.167.127.130 – 10.167.127.130	10.167.127.130
4	10.167.127.131/32	10.167.127.131 – 10.167.127.131	10.167.127.131
5	10.167.127.132/32	10.167.127.132 – 10.167.127.132	10.167.127.132
6	10.167.127.133/32	10.167.127.133 – 10.167.127.133	10.167.127.133
7	10.167.127.134/32	10.167.127.134 – 10.167.127.134	10.167.127.134
8	10.167.127.135/32	10.167.127.135 – 10.167.127.135	10.167.127.135
9	10.167.127.136/32	10.167.127.136 – 10.167.127.136	10.167.127.136
10	10.167.127.137/32	10.167.127.137 – 10.167.127.137	10.167.127.137
11	10.167.127.138/32	10.167.127.138 – 10.167.127.138	10.167.127.138
12	10.167.127.139/32	10.167.127.139 – 10.167.127.139	10.167.127.139
13	10.167.127.140/32	10.167.127.140 – 10.167.127.140	10.167.127.140
14	10.167.127.141/32	10.167.127.141 – 10.167.127.141	10.167.127.141
15	10.167.127.142/32	10.167.127.142 – 10.167.127.142	10.167.127.142
16	10.167.127.143/32	10.167.127.143 – 10.167.127.143	10.167.127.143
17	10.167.127.144/32	10.167.127.144 – 10.167.127.144	10.167.127.144
18	10.167.127.145/32	10.167.127.145 – 10.167.127.145	10.167.127.145
19	10.167.127.146/32	10.167.127.146 – 10.167.127.146	10.167.127.146
20	10.167.127.147/32	10.167.127.147 – 10.167.127.147	10.167.127.147
21	10.167.127.148/32	10.167.127.148 – 10.167.127.148	10.167.127.148
22	10.167.127.149/32	10.167.127.149 – 10.167.127.149	10.167.127.149
23	10.167.127.150/32	10.167.127.150 – 10.167.127.150	10.167.127.150
24	10.167.127.151/32	10.167.127.151 – 10.167.127.151	10.167.127.151
25	10.167.127.152/32	10.167.127.152 – 10.167.127.152	10.167.127.152
26	10.167.127.153/32	10.167.127.153 – 10.167.127.153	10.167.127.153
27	10.167.127.154/32	10.167.127.154 – 10.167.127.154	10.167.127.154
28	10.167.127.155/32	10.167.127.155 – 10.167.127.155	10.167.127.155
29	10.167.127.156/32	10.167.127.156 – 10.167.127.156	10.167.127.156
30	10.167.127.157/32	10.167.127.157 – 10.167.127.157	10.167.127.157
31	10.167.127.158/32	10.167.127.158 – 10.167.127.158	10.167.127.158
32	10.167.127.159/32	10.167.127.159 – 10.167.127.159	10.167.127.159
33	10.167.127.160/32	10.167.127.160 – 10.167.127.160	10.167.127.160
34	10.167.127.161/32	10.167.127.161 – 10.167.127.161	10.167.127.161
35	10.167.127.162/32	10.167.127.162 – 10.167.127.162	10.167.127.162
36	10.167.127.163/32	10.167.127.163 – 10.167.127.163	10.167.127.163
37	10.167.127.164/32	10.167.127.164 – 10.167.127.164	10.167.127.164
38	10.167.127.165/32	10.167.127.165 – 10.167.127.165	10.167.127.165
39	10.167.127.166/32	10.167.127.166 – 10.167.127.166	10.167.127.166
40	10.167.127.167/32	10.167.127.167 – 10.167.127.167	10.167.127.167
41	10.167.127.168/32	10.167.127.168 – 10.167.127.168	10.167.127.168
42	10.167.127.169/32	10.167.127.169 – 10.167.127.169	10.167.127.169
43	10.167.127.170/32	10.167.127.170 – 10.167.127.170	10.167.127.170
44	10.167.127.171/32	10.167.127.171 – 10.167.127.171	10.167.127.171
45	10.167.127.172/32	10.167.127.172 – 10.167.127.172	10.167.127.172
46	10.167.127.173/32	10.167.127.173 – 10.167.127.173	10.167.127.173
47	10.167.127.174/32	10.167.127.174 – 10.167.127.174	10.167.127.174
48	10.167.127.175/32	10.167.127.175 – 10.167.127.175	10.167.127.175
49	10.167.127.176/32	10.167.127.176 – 10.167.127.176	10.167.127.176
50	10.167.127.177/32	10.167.127.177 – 10.167.127.177	10.167.127.177
51	10.167.127.178/32	10.167.127.178 – 10.167.127.178	10.167.127.178
52	10.167.127.179/32	10.167.127.179 – 10.167.127.179	10.167.127.179
53	10.167.127.180/32	10.167.127.180 – 10.167.127.180	10.167.127.180
54	10.167.127.181/32	10.167.127.181 – 10.167.127.181	10.167.127.181
55	10.167.127.182/32	10.167.127.182 – 10.167.127.182	10.167.127.182
56	10.167.127.183/32	10.167.127.183 – 10.167.127.183	10.167.127.183
57	10.167.127.184/32	10.167.127.184 – 10.167.127.184	10.167.127.184
58	10.167.127.185/32	10.167.127.185 – 10.167.127.185	10.167.127.185
59	10.167.127.186/32	10.167.127.186 – 10.167.127.186	10.167.127.186
60	10.167.127.187/32	10.167.127.187 – 10.167.127.187	10.167.127.187
61	10.167.127.188/32	10.167.127.188 – 10.167.127.188	10.167.127.188
62	10.167.127.189/32	10.167.127.189 – 10.167.127.189	10.167.127.189
63	10.167.127.190/32	10.167.127.190 – 10.167.127.190	10.167.127.190
64	10.167.127.191/32	10.167.127.191 – 10.167.127.191	10.167.127.191
65	10.167.127.192/32	10.167.127.192 – 10.167.127.192	10.167.127.192
66	10.167.127.193/32	10.167.127.193 – 10.167.127.193	10.167.127.193
67	10.167.127.194/32	10.167.127.194 – 10.167.127.194	10.167.127.194
68	10.167.127.195/32	10.167.127.195 – 10.167.127.195	10.167.127.195
69	10.167.127.196/32	10.167.127.196 – 10.167.127.196	10.167.127.196
70	10.167.127.197/32	10.167.127.197 – 10.167.127.197	10.167.127.197
71	10.167.127.198/32	10.167.127.198 – 10.167.127.198	10.167.127.198
72	10.167.127.199/32	10.167.127.199 – 10.167.127.199	10.167.127.199
73	10.167.127.200/32	10.167.127.200 – 10.167.127.200	10.167.127.200
74	10.167.127.201/32	10.167.127.201 – 10.167.127.201	10.167.127.201
75	10.167.127.202/32	10.167.127.202 – 10.167.127.202	10.167.127.202
76	10.167.127.203/32	10.167.127.203 – 10.167.127.203	10.167.127.203
77	10.167.127.204/32	10.167.127.204 – 10.167.127.204	10.167.127.204
78	10.167.127.205/32	10.167.127.205 – 10.167.127.205	10.167.127.205
79	10.167.127.206/32	10.167.127.206 – 10.167.127.206	10.167.127.206
80	10.167.127.207/32	10.167.127.207 – 10.167.127.207	10.167.127.207
81	10.167.127.208/32	10.167.127.208 – 10.167.127.208	10.167.127.208
82	10.167.127.209/32	10.167.127.209 – 10.167.127.209	10.167.127.209
83	10.167.127.210/32	10.167.127.210 – 10.167.127.210	10.167.127.210
84	10.167.127.211/32	10.167.127.211 – 10.167.127.211	10.167.127.211
85	10.167.127.212/32	10.167.127.212 – 10.167.127.212	10.167.127.212
86	10.167.127.213/32	10.167.127.213 – 10.167.127.213	10.167.127.213
87	10.167.127.214/32	10.167.127.214 – 10.167.127.214	10.167.127.214
88	10.167.127.215/32	10.167.127.215 – 10.167.127.215	10.167.127.215
89	10.167.127.216/32	10.167.127.216 – 10.167.127.216	10.167.127.216
90	10.167.127.217/32	10.167.127.217 – 10.167.127.217	10.167.127.217
91	10.167.127.218/32	10.167.127.218 – 10.167.127.218	10.167.127.218
92	10.167.127.219/32	10.167.127.219 – 10.167.127.219	10.167.127.219
93	10.167.127.220/32	10.167.127.220 – 10.167.127.220	10.167.127.220
94	10.167.127.221/32	10.167.127.221 – 10.167.127.221	10.167.127.221
95	10.167.127.222/32	10.167.127.222 – 10.167.127.222	10.167.127.222
96	10.167.127.223/32	10.167.127.223 – 10.167.127.223	10.167.127.223
97	10.167.127.224/32	10.167.127.224 – 10.167.127.224	10.167.127.224
98	10.167.127.225/32	10.167.127.225 – 10.167.127.225	10.167.127.225
99	10.167.127.226/32	10.167.127.226 – 10.167.127.226	10.167.127.226
100	10.167.127.227/32	10.167.127.227 – 10.167.127.227	10.167.127.227
101	10.167.127.228/32	10.167.127.228 – 10.167.127.228	10.167.127.228
102	10.167.127.229/32	10.167.127.229 – 10.167.127.229	10.167.127.229
103	10.167.127.230/32	10.167.127.230 – 10.167.127.230	10.167.127.230
104	10.167.127.231/32	10.167.127.231 – 10.167.127.231	10.167.127.231
105	10.167.127.232/32	10.167.127.232 – 10.167.127.232	10.167.127.232
106	10.167.127.233/32	10.167.127.233 – 10.167.127.233	10.167.127.233
107	10.167.127.234/32	10.167.127.234 – 10.167.127.234	10.167.127.234
108	10.167.127.235/32	10.167.127.235 – 10.167.127.235	10.167.127.235
109	10.167.127.236/32	10.167.127.236 – 10.167.127.236	10.167.127.236
110	10.167.127.237/32	10.167.127.237 – 10.167.127.237	10.167.127.237
111	10.167.127.238/32	10.167.127.238 – 10.167.127.238	10.167.127.238
112	10.167.127.239/32	10.167.127.239 – 10.167.127.239	10.167.127.239
113	10.167.127.240/32	10.167.127.240 – 10.167.127.240	10.167.127.240
114	10.167.127.241/32	10.167.127.241 – 10.167.127.241	10.167.127.241
115	10.167.127.242/32	10.167.127.242 – 10.167.127.242	10.167.127.242
116	10.167.127.243/32	10.167.127.243 – 10.167.127.243	10.167.127.243
117	10.167.127.244/32	10.167.127.244 – 10.167.127.244	10.167.127.244
118	10.167.127.245/32	10.167.127.245 – 10.167.127.245	10.167.127.245
119	10.167.127.246/32	10.167.127.246 – 10.167.127.246	10.167.127.246
120	10.167.127.247/32	10.167.127.247 – 10.167.127.247	10.167.127.247
121	10.167.127.248/32	10.167.127.248 – 10.167.127.248	10.167.127.248
122	10.167.127.249/32	10.167.127.249 – 10.167.127.249	10.167.127.249
123	10.167.127.250/32	10.167.127.250 – 10.167.127.250	10.167.127.250
124	10.167.127.251/32	10.167.127.251 – 10.167.127.251	10.167.127.251
125	10.167.127.252/32	10.167.127.252 – 10.167.127.252	10.167.127.252
126	10.167.127.253/32	10.167.127.253 – 10.167.127.253	10.167.127.253
127	10.167.127.254/32	10.167.127.254 – 10.167.127.254	10.167.127.254
128	10.167.127.255/32	10.167.127.255 – 10.167.127.255	10.167.127.255

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 →