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)10.0.26.128/25

network10.0.26.128/25

broadcast10.0.26.255

first host10.0.26.129

last host10.0.26.254

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.0.26.128/25

address00001010.00000000.00011010.10000000

subnet mask11111111.11111111.11111111.10000000

network00001010.00000000.00011010.10000000

broadcast00001010.00000000.00011010.11111111

green = network part, grey = host part

hex0x0a001a80

decimal167778944

reverse dns128.26.0.10.in-addr.arpa

ipv4-mapped::ffff:a00:1a80

/25 split into /32 · 128 subnets

close ×

#	network	host range	broadcast
1	10.0.26.128/32	10.0.26.128 – 10.0.26.128	10.0.26.128
2	10.0.26.129/32	10.0.26.129 – 10.0.26.129	10.0.26.129
3	10.0.26.130/32	10.0.26.130 – 10.0.26.130	10.0.26.130
4	10.0.26.131/32	10.0.26.131 – 10.0.26.131	10.0.26.131
5	10.0.26.132/32	10.0.26.132 – 10.0.26.132	10.0.26.132
6	10.0.26.133/32	10.0.26.133 – 10.0.26.133	10.0.26.133
7	10.0.26.134/32	10.0.26.134 – 10.0.26.134	10.0.26.134
8	10.0.26.135/32	10.0.26.135 – 10.0.26.135	10.0.26.135
9	10.0.26.136/32	10.0.26.136 – 10.0.26.136	10.0.26.136
10	10.0.26.137/32	10.0.26.137 – 10.0.26.137	10.0.26.137
11	10.0.26.138/32	10.0.26.138 – 10.0.26.138	10.0.26.138
12	10.0.26.139/32	10.0.26.139 – 10.0.26.139	10.0.26.139
13	10.0.26.140/32	10.0.26.140 – 10.0.26.140	10.0.26.140
14	10.0.26.141/32	10.0.26.141 – 10.0.26.141	10.0.26.141
15	10.0.26.142/32	10.0.26.142 – 10.0.26.142	10.0.26.142
16	10.0.26.143/32	10.0.26.143 – 10.0.26.143	10.0.26.143
17	10.0.26.144/32	10.0.26.144 – 10.0.26.144	10.0.26.144
18	10.0.26.145/32	10.0.26.145 – 10.0.26.145	10.0.26.145
19	10.0.26.146/32	10.0.26.146 – 10.0.26.146	10.0.26.146
20	10.0.26.147/32	10.0.26.147 – 10.0.26.147	10.0.26.147
21	10.0.26.148/32	10.0.26.148 – 10.0.26.148	10.0.26.148
22	10.0.26.149/32	10.0.26.149 – 10.0.26.149	10.0.26.149
23	10.0.26.150/32	10.0.26.150 – 10.0.26.150	10.0.26.150
24	10.0.26.151/32	10.0.26.151 – 10.0.26.151	10.0.26.151
25	10.0.26.152/32	10.0.26.152 – 10.0.26.152	10.0.26.152
26	10.0.26.153/32	10.0.26.153 – 10.0.26.153	10.0.26.153
27	10.0.26.154/32	10.0.26.154 – 10.0.26.154	10.0.26.154
28	10.0.26.155/32	10.0.26.155 – 10.0.26.155	10.0.26.155
29	10.0.26.156/32	10.0.26.156 – 10.0.26.156	10.0.26.156
30	10.0.26.157/32	10.0.26.157 – 10.0.26.157	10.0.26.157
31	10.0.26.158/32	10.0.26.158 – 10.0.26.158	10.0.26.158
32	10.0.26.159/32	10.0.26.159 – 10.0.26.159	10.0.26.159
33	10.0.26.160/32	10.0.26.160 – 10.0.26.160	10.0.26.160
34	10.0.26.161/32	10.0.26.161 – 10.0.26.161	10.0.26.161
35	10.0.26.162/32	10.0.26.162 – 10.0.26.162	10.0.26.162
36	10.0.26.163/32	10.0.26.163 – 10.0.26.163	10.0.26.163
37	10.0.26.164/32	10.0.26.164 – 10.0.26.164	10.0.26.164
38	10.0.26.165/32	10.0.26.165 – 10.0.26.165	10.0.26.165
39	10.0.26.166/32	10.0.26.166 – 10.0.26.166	10.0.26.166
40	10.0.26.167/32	10.0.26.167 – 10.0.26.167	10.0.26.167
41	10.0.26.168/32	10.0.26.168 – 10.0.26.168	10.0.26.168
42	10.0.26.169/32	10.0.26.169 – 10.0.26.169	10.0.26.169
43	10.0.26.170/32	10.0.26.170 – 10.0.26.170	10.0.26.170
44	10.0.26.171/32	10.0.26.171 – 10.0.26.171	10.0.26.171
45	10.0.26.172/32	10.0.26.172 – 10.0.26.172	10.0.26.172
46	10.0.26.173/32	10.0.26.173 – 10.0.26.173	10.0.26.173
47	10.0.26.174/32	10.0.26.174 – 10.0.26.174	10.0.26.174
48	10.0.26.175/32	10.0.26.175 – 10.0.26.175	10.0.26.175
49	10.0.26.176/32	10.0.26.176 – 10.0.26.176	10.0.26.176
50	10.0.26.177/32	10.0.26.177 – 10.0.26.177	10.0.26.177
51	10.0.26.178/32	10.0.26.178 – 10.0.26.178	10.0.26.178
52	10.0.26.179/32	10.0.26.179 – 10.0.26.179	10.0.26.179
53	10.0.26.180/32	10.0.26.180 – 10.0.26.180	10.0.26.180
54	10.0.26.181/32	10.0.26.181 – 10.0.26.181	10.0.26.181
55	10.0.26.182/32	10.0.26.182 – 10.0.26.182	10.0.26.182
56	10.0.26.183/32	10.0.26.183 – 10.0.26.183	10.0.26.183
57	10.0.26.184/32	10.0.26.184 – 10.0.26.184	10.0.26.184
58	10.0.26.185/32	10.0.26.185 – 10.0.26.185	10.0.26.185
59	10.0.26.186/32	10.0.26.186 – 10.0.26.186	10.0.26.186
60	10.0.26.187/32	10.0.26.187 – 10.0.26.187	10.0.26.187
61	10.0.26.188/32	10.0.26.188 – 10.0.26.188	10.0.26.188
62	10.0.26.189/32	10.0.26.189 – 10.0.26.189	10.0.26.189
63	10.0.26.190/32	10.0.26.190 – 10.0.26.190	10.0.26.190
64	10.0.26.191/32	10.0.26.191 – 10.0.26.191	10.0.26.191
65	10.0.26.192/32	10.0.26.192 – 10.0.26.192	10.0.26.192
66	10.0.26.193/32	10.0.26.193 – 10.0.26.193	10.0.26.193
67	10.0.26.194/32	10.0.26.194 – 10.0.26.194	10.0.26.194
68	10.0.26.195/32	10.0.26.195 – 10.0.26.195	10.0.26.195
69	10.0.26.196/32	10.0.26.196 – 10.0.26.196	10.0.26.196
70	10.0.26.197/32	10.0.26.197 – 10.0.26.197	10.0.26.197
71	10.0.26.198/32	10.0.26.198 – 10.0.26.198	10.0.26.198
72	10.0.26.199/32	10.0.26.199 – 10.0.26.199	10.0.26.199
73	10.0.26.200/32	10.0.26.200 – 10.0.26.200	10.0.26.200
74	10.0.26.201/32	10.0.26.201 – 10.0.26.201	10.0.26.201
75	10.0.26.202/32	10.0.26.202 – 10.0.26.202	10.0.26.202
76	10.0.26.203/32	10.0.26.203 – 10.0.26.203	10.0.26.203
77	10.0.26.204/32	10.0.26.204 – 10.0.26.204	10.0.26.204
78	10.0.26.205/32	10.0.26.205 – 10.0.26.205	10.0.26.205
79	10.0.26.206/32	10.0.26.206 – 10.0.26.206	10.0.26.206
80	10.0.26.207/32	10.0.26.207 – 10.0.26.207	10.0.26.207
81	10.0.26.208/32	10.0.26.208 – 10.0.26.208	10.0.26.208
82	10.0.26.209/32	10.0.26.209 – 10.0.26.209	10.0.26.209
83	10.0.26.210/32	10.0.26.210 – 10.0.26.210	10.0.26.210
84	10.0.26.211/32	10.0.26.211 – 10.0.26.211	10.0.26.211
85	10.0.26.212/32	10.0.26.212 – 10.0.26.212	10.0.26.212
86	10.0.26.213/32	10.0.26.213 – 10.0.26.213	10.0.26.213
87	10.0.26.214/32	10.0.26.214 – 10.0.26.214	10.0.26.214
88	10.0.26.215/32	10.0.26.215 – 10.0.26.215	10.0.26.215
89	10.0.26.216/32	10.0.26.216 – 10.0.26.216	10.0.26.216
90	10.0.26.217/32	10.0.26.217 – 10.0.26.217	10.0.26.217
91	10.0.26.218/32	10.0.26.218 – 10.0.26.218	10.0.26.218
92	10.0.26.219/32	10.0.26.219 – 10.0.26.219	10.0.26.219
93	10.0.26.220/32	10.0.26.220 – 10.0.26.220	10.0.26.220
94	10.0.26.221/32	10.0.26.221 – 10.0.26.221	10.0.26.221
95	10.0.26.222/32	10.0.26.222 – 10.0.26.222	10.0.26.222
96	10.0.26.223/32	10.0.26.223 – 10.0.26.223	10.0.26.223
97	10.0.26.224/32	10.0.26.224 – 10.0.26.224	10.0.26.224
98	10.0.26.225/32	10.0.26.225 – 10.0.26.225	10.0.26.225
99	10.0.26.226/32	10.0.26.226 – 10.0.26.226	10.0.26.226
100	10.0.26.227/32	10.0.26.227 – 10.0.26.227	10.0.26.227
101	10.0.26.228/32	10.0.26.228 – 10.0.26.228	10.0.26.228
102	10.0.26.229/32	10.0.26.229 – 10.0.26.229	10.0.26.229
103	10.0.26.230/32	10.0.26.230 – 10.0.26.230	10.0.26.230
104	10.0.26.231/32	10.0.26.231 – 10.0.26.231	10.0.26.231
105	10.0.26.232/32	10.0.26.232 – 10.0.26.232	10.0.26.232
106	10.0.26.233/32	10.0.26.233 – 10.0.26.233	10.0.26.233
107	10.0.26.234/32	10.0.26.234 – 10.0.26.234	10.0.26.234
108	10.0.26.235/32	10.0.26.235 – 10.0.26.235	10.0.26.235
109	10.0.26.236/32	10.0.26.236 – 10.0.26.236	10.0.26.236
110	10.0.26.237/32	10.0.26.237 – 10.0.26.237	10.0.26.237
111	10.0.26.238/32	10.0.26.238 – 10.0.26.238	10.0.26.238
112	10.0.26.239/32	10.0.26.239 – 10.0.26.239	10.0.26.239
113	10.0.26.240/32	10.0.26.240 – 10.0.26.240	10.0.26.240
114	10.0.26.241/32	10.0.26.241 – 10.0.26.241	10.0.26.241
115	10.0.26.242/32	10.0.26.242 – 10.0.26.242	10.0.26.242
116	10.0.26.243/32	10.0.26.243 – 10.0.26.243	10.0.26.243
117	10.0.26.244/32	10.0.26.244 – 10.0.26.244	10.0.26.244
118	10.0.26.245/32	10.0.26.245 – 10.0.26.245	10.0.26.245
119	10.0.26.246/32	10.0.26.246 – 10.0.26.246	10.0.26.246
120	10.0.26.247/32	10.0.26.247 – 10.0.26.247	10.0.26.247
121	10.0.26.248/32	10.0.26.248 – 10.0.26.248	10.0.26.248
122	10.0.26.249/32	10.0.26.249 – 10.0.26.249	10.0.26.249
123	10.0.26.250/32	10.0.26.250 – 10.0.26.250	10.0.26.250
124	10.0.26.251/32	10.0.26.251 – 10.0.26.251	10.0.26.251
125	10.0.26.252/32	10.0.26.252 – 10.0.26.252	10.0.26.252
126	10.0.26.253/32	10.0.26.253 – 10.0.26.253	10.0.26.253
127	10.0.26.254/32	10.0.26.254 – 10.0.26.254	10.0.26.254
128	10.0.26.255/32	10.0.26.255 – 10.0.26.255	10.0.26.255

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 →