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)10.0.103.128/25

network10.0.103.128/25

broadcast10.0.103.255

first host10.0.103.129

last host10.0.103.254

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.0.103.128/25

address00001010.00000000.01100111.10000000

subnet mask11111111.11111111.11111111.10000000

network00001010.00000000.01100111.10000000

broadcast00001010.00000000.01100111.11111111

green = network part, grey = host part

hex0x0a006780

decimal167798656

reverse dns128.103.0.10.in-addr.arpa

ipv4-mapped::ffff:a00:6780

/25 split into /32 · 128 subnets

close ×

#	network	host range	broadcast
1	10.0.103.128/32	10.0.103.128 – 10.0.103.128	10.0.103.128
2	10.0.103.129/32	10.0.103.129 – 10.0.103.129	10.0.103.129
3	10.0.103.130/32	10.0.103.130 – 10.0.103.130	10.0.103.130
4	10.0.103.131/32	10.0.103.131 – 10.0.103.131	10.0.103.131
5	10.0.103.132/32	10.0.103.132 – 10.0.103.132	10.0.103.132
6	10.0.103.133/32	10.0.103.133 – 10.0.103.133	10.0.103.133
7	10.0.103.134/32	10.0.103.134 – 10.0.103.134	10.0.103.134
8	10.0.103.135/32	10.0.103.135 – 10.0.103.135	10.0.103.135
9	10.0.103.136/32	10.0.103.136 – 10.0.103.136	10.0.103.136
10	10.0.103.137/32	10.0.103.137 – 10.0.103.137	10.0.103.137
11	10.0.103.138/32	10.0.103.138 – 10.0.103.138	10.0.103.138
12	10.0.103.139/32	10.0.103.139 – 10.0.103.139	10.0.103.139
13	10.0.103.140/32	10.0.103.140 – 10.0.103.140	10.0.103.140
14	10.0.103.141/32	10.0.103.141 – 10.0.103.141	10.0.103.141
15	10.0.103.142/32	10.0.103.142 – 10.0.103.142	10.0.103.142
16	10.0.103.143/32	10.0.103.143 – 10.0.103.143	10.0.103.143
17	10.0.103.144/32	10.0.103.144 – 10.0.103.144	10.0.103.144
18	10.0.103.145/32	10.0.103.145 – 10.0.103.145	10.0.103.145
19	10.0.103.146/32	10.0.103.146 – 10.0.103.146	10.0.103.146
20	10.0.103.147/32	10.0.103.147 – 10.0.103.147	10.0.103.147
21	10.0.103.148/32	10.0.103.148 – 10.0.103.148	10.0.103.148
22	10.0.103.149/32	10.0.103.149 – 10.0.103.149	10.0.103.149
23	10.0.103.150/32	10.0.103.150 – 10.0.103.150	10.0.103.150
24	10.0.103.151/32	10.0.103.151 – 10.0.103.151	10.0.103.151
25	10.0.103.152/32	10.0.103.152 – 10.0.103.152	10.0.103.152
26	10.0.103.153/32	10.0.103.153 – 10.0.103.153	10.0.103.153
27	10.0.103.154/32	10.0.103.154 – 10.0.103.154	10.0.103.154
28	10.0.103.155/32	10.0.103.155 – 10.0.103.155	10.0.103.155
29	10.0.103.156/32	10.0.103.156 – 10.0.103.156	10.0.103.156
30	10.0.103.157/32	10.0.103.157 – 10.0.103.157	10.0.103.157
31	10.0.103.158/32	10.0.103.158 – 10.0.103.158	10.0.103.158
32	10.0.103.159/32	10.0.103.159 – 10.0.103.159	10.0.103.159
33	10.0.103.160/32	10.0.103.160 – 10.0.103.160	10.0.103.160
34	10.0.103.161/32	10.0.103.161 – 10.0.103.161	10.0.103.161
35	10.0.103.162/32	10.0.103.162 – 10.0.103.162	10.0.103.162
36	10.0.103.163/32	10.0.103.163 – 10.0.103.163	10.0.103.163
37	10.0.103.164/32	10.0.103.164 – 10.0.103.164	10.0.103.164
38	10.0.103.165/32	10.0.103.165 – 10.0.103.165	10.0.103.165
39	10.0.103.166/32	10.0.103.166 – 10.0.103.166	10.0.103.166
40	10.0.103.167/32	10.0.103.167 – 10.0.103.167	10.0.103.167
41	10.0.103.168/32	10.0.103.168 – 10.0.103.168	10.0.103.168
42	10.0.103.169/32	10.0.103.169 – 10.0.103.169	10.0.103.169
43	10.0.103.170/32	10.0.103.170 – 10.0.103.170	10.0.103.170
44	10.0.103.171/32	10.0.103.171 – 10.0.103.171	10.0.103.171
45	10.0.103.172/32	10.0.103.172 – 10.0.103.172	10.0.103.172
46	10.0.103.173/32	10.0.103.173 – 10.0.103.173	10.0.103.173
47	10.0.103.174/32	10.0.103.174 – 10.0.103.174	10.0.103.174
48	10.0.103.175/32	10.0.103.175 – 10.0.103.175	10.0.103.175
49	10.0.103.176/32	10.0.103.176 – 10.0.103.176	10.0.103.176
50	10.0.103.177/32	10.0.103.177 – 10.0.103.177	10.0.103.177
51	10.0.103.178/32	10.0.103.178 – 10.0.103.178	10.0.103.178
52	10.0.103.179/32	10.0.103.179 – 10.0.103.179	10.0.103.179
53	10.0.103.180/32	10.0.103.180 – 10.0.103.180	10.0.103.180
54	10.0.103.181/32	10.0.103.181 – 10.0.103.181	10.0.103.181
55	10.0.103.182/32	10.0.103.182 – 10.0.103.182	10.0.103.182
56	10.0.103.183/32	10.0.103.183 – 10.0.103.183	10.0.103.183
57	10.0.103.184/32	10.0.103.184 – 10.0.103.184	10.0.103.184
58	10.0.103.185/32	10.0.103.185 – 10.0.103.185	10.0.103.185
59	10.0.103.186/32	10.0.103.186 – 10.0.103.186	10.0.103.186
60	10.0.103.187/32	10.0.103.187 – 10.0.103.187	10.0.103.187
61	10.0.103.188/32	10.0.103.188 – 10.0.103.188	10.0.103.188
62	10.0.103.189/32	10.0.103.189 – 10.0.103.189	10.0.103.189
63	10.0.103.190/32	10.0.103.190 – 10.0.103.190	10.0.103.190
64	10.0.103.191/32	10.0.103.191 – 10.0.103.191	10.0.103.191
65	10.0.103.192/32	10.0.103.192 – 10.0.103.192	10.0.103.192
66	10.0.103.193/32	10.0.103.193 – 10.0.103.193	10.0.103.193
67	10.0.103.194/32	10.0.103.194 – 10.0.103.194	10.0.103.194
68	10.0.103.195/32	10.0.103.195 – 10.0.103.195	10.0.103.195
69	10.0.103.196/32	10.0.103.196 – 10.0.103.196	10.0.103.196
70	10.0.103.197/32	10.0.103.197 – 10.0.103.197	10.0.103.197
71	10.0.103.198/32	10.0.103.198 – 10.0.103.198	10.0.103.198
72	10.0.103.199/32	10.0.103.199 – 10.0.103.199	10.0.103.199
73	10.0.103.200/32	10.0.103.200 – 10.0.103.200	10.0.103.200
74	10.0.103.201/32	10.0.103.201 – 10.0.103.201	10.0.103.201
75	10.0.103.202/32	10.0.103.202 – 10.0.103.202	10.0.103.202
76	10.0.103.203/32	10.0.103.203 – 10.0.103.203	10.0.103.203
77	10.0.103.204/32	10.0.103.204 – 10.0.103.204	10.0.103.204
78	10.0.103.205/32	10.0.103.205 – 10.0.103.205	10.0.103.205
79	10.0.103.206/32	10.0.103.206 – 10.0.103.206	10.0.103.206
80	10.0.103.207/32	10.0.103.207 – 10.0.103.207	10.0.103.207
81	10.0.103.208/32	10.0.103.208 – 10.0.103.208	10.0.103.208
82	10.0.103.209/32	10.0.103.209 – 10.0.103.209	10.0.103.209
83	10.0.103.210/32	10.0.103.210 – 10.0.103.210	10.0.103.210
84	10.0.103.211/32	10.0.103.211 – 10.0.103.211	10.0.103.211
85	10.0.103.212/32	10.0.103.212 – 10.0.103.212	10.0.103.212
86	10.0.103.213/32	10.0.103.213 – 10.0.103.213	10.0.103.213
87	10.0.103.214/32	10.0.103.214 – 10.0.103.214	10.0.103.214
88	10.0.103.215/32	10.0.103.215 – 10.0.103.215	10.0.103.215
89	10.0.103.216/32	10.0.103.216 – 10.0.103.216	10.0.103.216
90	10.0.103.217/32	10.0.103.217 – 10.0.103.217	10.0.103.217
91	10.0.103.218/32	10.0.103.218 – 10.0.103.218	10.0.103.218
92	10.0.103.219/32	10.0.103.219 – 10.0.103.219	10.0.103.219
93	10.0.103.220/32	10.0.103.220 – 10.0.103.220	10.0.103.220
94	10.0.103.221/32	10.0.103.221 – 10.0.103.221	10.0.103.221
95	10.0.103.222/32	10.0.103.222 – 10.0.103.222	10.0.103.222
96	10.0.103.223/32	10.0.103.223 – 10.0.103.223	10.0.103.223
97	10.0.103.224/32	10.0.103.224 – 10.0.103.224	10.0.103.224
98	10.0.103.225/32	10.0.103.225 – 10.0.103.225	10.0.103.225
99	10.0.103.226/32	10.0.103.226 – 10.0.103.226	10.0.103.226
100	10.0.103.227/32	10.0.103.227 – 10.0.103.227	10.0.103.227
101	10.0.103.228/32	10.0.103.228 – 10.0.103.228	10.0.103.228
102	10.0.103.229/32	10.0.103.229 – 10.0.103.229	10.0.103.229
103	10.0.103.230/32	10.0.103.230 – 10.0.103.230	10.0.103.230
104	10.0.103.231/32	10.0.103.231 – 10.0.103.231	10.0.103.231
105	10.0.103.232/32	10.0.103.232 – 10.0.103.232	10.0.103.232
106	10.0.103.233/32	10.0.103.233 – 10.0.103.233	10.0.103.233
107	10.0.103.234/32	10.0.103.234 – 10.0.103.234	10.0.103.234
108	10.0.103.235/32	10.0.103.235 – 10.0.103.235	10.0.103.235
109	10.0.103.236/32	10.0.103.236 – 10.0.103.236	10.0.103.236
110	10.0.103.237/32	10.0.103.237 – 10.0.103.237	10.0.103.237
111	10.0.103.238/32	10.0.103.238 – 10.0.103.238	10.0.103.238
112	10.0.103.239/32	10.0.103.239 – 10.0.103.239	10.0.103.239
113	10.0.103.240/32	10.0.103.240 – 10.0.103.240	10.0.103.240
114	10.0.103.241/32	10.0.103.241 – 10.0.103.241	10.0.103.241
115	10.0.103.242/32	10.0.103.242 – 10.0.103.242	10.0.103.242
116	10.0.103.243/32	10.0.103.243 – 10.0.103.243	10.0.103.243
117	10.0.103.244/32	10.0.103.244 – 10.0.103.244	10.0.103.244
118	10.0.103.245/32	10.0.103.245 – 10.0.103.245	10.0.103.245
119	10.0.103.246/32	10.0.103.246 – 10.0.103.246	10.0.103.246
120	10.0.103.247/32	10.0.103.247 – 10.0.103.247	10.0.103.247
121	10.0.103.248/32	10.0.103.248 – 10.0.103.248	10.0.103.248
122	10.0.103.249/32	10.0.103.249 – 10.0.103.249	10.0.103.249
123	10.0.103.250/32	10.0.103.250 – 10.0.103.250	10.0.103.250
124	10.0.103.251/32	10.0.103.251 – 10.0.103.251	10.0.103.251
125	10.0.103.252/32	10.0.103.252 – 10.0.103.252	10.0.103.252
126	10.0.103.253/32	10.0.103.253 – 10.0.103.253	10.0.103.253
127	10.0.103.254/32	10.0.103.254 – 10.0.103.254	10.0.103.254
128	10.0.103.255/32	10.0.103.255 – 10.0.103.255	10.0.103.255

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 →