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)10.0.29.128/25

network10.0.29.128/25

broadcast10.0.29.255

first host10.0.29.129

last host10.0.29.254

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.0.29.128/25

address00001010.00000000.00011101.10000000

subnet mask11111111.11111111.11111111.10000000

network00001010.00000000.00011101.10000000

broadcast00001010.00000000.00011101.11111111

green = network part, grey = host part

hex0x0a001d80

decimal167779712

reverse dns128.29.0.10.in-addr.arpa

ipv4-mapped::ffff:a00:1d80

/25 split into /32 · 128 subnets

close ×

#	network	host range	broadcast
1	10.0.29.128/32	10.0.29.128 – 10.0.29.128	10.0.29.128
2	10.0.29.129/32	10.0.29.129 – 10.0.29.129	10.0.29.129
3	10.0.29.130/32	10.0.29.130 – 10.0.29.130	10.0.29.130
4	10.0.29.131/32	10.0.29.131 – 10.0.29.131	10.0.29.131
5	10.0.29.132/32	10.0.29.132 – 10.0.29.132	10.0.29.132
6	10.0.29.133/32	10.0.29.133 – 10.0.29.133	10.0.29.133
7	10.0.29.134/32	10.0.29.134 – 10.0.29.134	10.0.29.134
8	10.0.29.135/32	10.0.29.135 – 10.0.29.135	10.0.29.135
9	10.0.29.136/32	10.0.29.136 – 10.0.29.136	10.0.29.136
10	10.0.29.137/32	10.0.29.137 – 10.0.29.137	10.0.29.137
11	10.0.29.138/32	10.0.29.138 – 10.0.29.138	10.0.29.138
12	10.0.29.139/32	10.0.29.139 – 10.0.29.139	10.0.29.139
13	10.0.29.140/32	10.0.29.140 – 10.0.29.140	10.0.29.140
14	10.0.29.141/32	10.0.29.141 – 10.0.29.141	10.0.29.141
15	10.0.29.142/32	10.0.29.142 – 10.0.29.142	10.0.29.142
16	10.0.29.143/32	10.0.29.143 – 10.0.29.143	10.0.29.143
17	10.0.29.144/32	10.0.29.144 – 10.0.29.144	10.0.29.144
18	10.0.29.145/32	10.0.29.145 – 10.0.29.145	10.0.29.145
19	10.0.29.146/32	10.0.29.146 – 10.0.29.146	10.0.29.146
20	10.0.29.147/32	10.0.29.147 – 10.0.29.147	10.0.29.147
21	10.0.29.148/32	10.0.29.148 – 10.0.29.148	10.0.29.148
22	10.0.29.149/32	10.0.29.149 – 10.0.29.149	10.0.29.149
23	10.0.29.150/32	10.0.29.150 – 10.0.29.150	10.0.29.150
24	10.0.29.151/32	10.0.29.151 – 10.0.29.151	10.0.29.151
25	10.0.29.152/32	10.0.29.152 – 10.0.29.152	10.0.29.152
26	10.0.29.153/32	10.0.29.153 – 10.0.29.153	10.0.29.153
27	10.0.29.154/32	10.0.29.154 – 10.0.29.154	10.0.29.154
28	10.0.29.155/32	10.0.29.155 – 10.0.29.155	10.0.29.155
29	10.0.29.156/32	10.0.29.156 – 10.0.29.156	10.0.29.156
30	10.0.29.157/32	10.0.29.157 – 10.0.29.157	10.0.29.157
31	10.0.29.158/32	10.0.29.158 – 10.0.29.158	10.0.29.158
32	10.0.29.159/32	10.0.29.159 – 10.0.29.159	10.0.29.159
33	10.0.29.160/32	10.0.29.160 – 10.0.29.160	10.0.29.160
34	10.0.29.161/32	10.0.29.161 – 10.0.29.161	10.0.29.161
35	10.0.29.162/32	10.0.29.162 – 10.0.29.162	10.0.29.162
36	10.0.29.163/32	10.0.29.163 – 10.0.29.163	10.0.29.163
37	10.0.29.164/32	10.0.29.164 – 10.0.29.164	10.0.29.164
38	10.0.29.165/32	10.0.29.165 – 10.0.29.165	10.0.29.165
39	10.0.29.166/32	10.0.29.166 – 10.0.29.166	10.0.29.166
40	10.0.29.167/32	10.0.29.167 – 10.0.29.167	10.0.29.167
41	10.0.29.168/32	10.0.29.168 – 10.0.29.168	10.0.29.168
42	10.0.29.169/32	10.0.29.169 – 10.0.29.169	10.0.29.169
43	10.0.29.170/32	10.0.29.170 – 10.0.29.170	10.0.29.170
44	10.0.29.171/32	10.0.29.171 – 10.0.29.171	10.0.29.171
45	10.0.29.172/32	10.0.29.172 – 10.0.29.172	10.0.29.172
46	10.0.29.173/32	10.0.29.173 – 10.0.29.173	10.0.29.173
47	10.0.29.174/32	10.0.29.174 – 10.0.29.174	10.0.29.174
48	10.0.29.175/32	10.0.29.175 – 10.0.29.175	10.0.29.175
49	10.0.29.176/32	10.0.29.176 – 10.0.29.176	10.0.29.176
50	10.0.29.177/32	10.0.29.177 – 10.0.29.177	10.0.29.177
51	10.0.29.178/32	10.0.29.178 – 10.0.29.178	10.0.29.178
52	10.0.29.179/32	10.0.29.179 – 10.0.29.179	10.0.29.179
53	10.0.29.180/32	10.0.29.180 – 10.0.29.180	10.0.29.180
54	10.0.29.181/32	10.0.29.181 – 10.0.29.181	10.0.29.181
55	10.0.29.182/32	10.0.29.182 – 10.0.29.182	10.0.29.182
56	10.0.29.183/32	10.0.29.183 – 10.0.29.183	10.0.29.183
57	10.0.29.184/32	10.0.29.184 – 10.0.29.184	10.0.29.184
58	10.0.29.185/32	10.0.29.185 – 10.0.29.185	10.0.29.185
59	10.0.29.186/32	10.0.29.186 – 10.0.29.186	10.0.29.186
60	10.0.29.187/32	10.0.29.187 – 10.0.29.187	10.0.29.187
61	10.0.29.188/32	10.0.29.188 – 10.0.29.188	10.0.29.188
62	10.0.29.189/32	10.0.29.189 – 10.0.29.189	10.0.29.189
63	10.0.29.190/32	10.0.29.190 – 10.0.29.190	10.0.29.190
64	10.0.29.191/32	10.0.29.191 – 10.0.29.191	10.0.29.191
65	10.0.29.192/32	10.0.29.192 – 10.0.29.192	10.0.29.192
66	10.0.29.193/32	10.0.29.193 – 10.0.29.193	10.0.29.193
67	10.0.29.194/32	10.0.29.194 – 10.0.29.194	10.0.29.194
68	10.0.29.195/32	10.0.29.195 – 10.0.29.195	10.0.29.195
69	10.0.29.196/32	10.0.29.196 – 10.0.29.196	10.0.29.196
70	10.0.29.197/32	10.0.29.197 – 10.0.29.197	10.0.29.197
71	10.0.29.198/32	10.0.29.198 – 10.0.29.198	10.0.29.198
72	10.0.29.199/32	10.0.29.199 – 10.0.29.199	10.0.29.199
73	10.0.29.200/32	10.0.29.200 – 10.0.29.200	10.0.29.200
74	10.0.29.201/32	10.0.29.201 – 10.0.29.201	10.0.29.201
75	10.0.29.202/32	10.0.29.202 – 10.0.29.202	10.0.29.202
76	10.0.29.203/32	10.0.29.203 – 10.0.29.203	10.0.29.203
77	10.0.29.204/32	10.0.29.204 – 10.0.29.204	10.0.29.204
78	10.0.29.205/32	10.0.29.205 – 10.0.29.205	10.0.29.205
79	10.0.29.206/32	10.0.29.206 – 10.0.29.206	10.0.29.206
80	10.0.29.207/32	10.0.29.207 – 10.0.29.207	10.0.29.207
81	10.0.29.208/32	10.0.29.208 – 10.0.29.208	10.0.29.208
82	10.0.29.209/32	10.0.29.209 – 10.0.29.209	10.0.29.209
83	10.0.29.210/32	10.0.29.210 – 10.0.29.210	10.0.29.210
84	10.0.29.211/32	10.0.29.211 – 10.0.29.211	10.0.29.211
85	10.0.29.212/32	10.0.29.212 – 10.0.29.212	10.0.29.212
86	10.0.29.213/32	10.0.29.213 – 10.0.29.213	10.0.29.213
87	10.0.29.214/32	10.0.29.214 – 10.0.29.214	10.0.29.214
88	10.0.29.215/32	10.0.29.215 – 10.0.29.215	10.0.29.215
89	10.0.29.216/32	10.0.29.216 – 10.0.29.216	10.0.29.216
90	10.0.29.217/32	10.0.29.217 – 10.0.29.217	10.0.29.217
91	10.0.29.218/32	10.0.29.218 – 10.0.29.218	10.0.29.218
92	10.0.29.219/32	10.0.29.219 – 10.0.29.219	10.0.29.219
93	10.0.29.220/32	10.0.29.220 – 10.0.29.220	10.0.29.220
94	10.0.29.221/32	10.0.29.221 – 10.0.29.221	10.0.29.221
95	10.0.29.222/32	10.0.29.222 – 10.0.29.222	10.0.29.222
96	10.0.29.223/32	10.0.29.223 – 10.0.29.223	10.0.29.223
97	10.0.29.224/32	10.0.29.224 – 10.0.29.224	10.0.29.224
98	10.0.29.225/32	10.0.29.225 – 10.0.29.225	10.0.29.225
99	10.0.29.226/32	10.0.29.226 – 10.0.29.226	10.0.29.226
100	10.0.29.227/32	10.0.29.227 – 10.0.29.227	10.0.29.227
101	10.0.29.228/32	10.0.29.228 – 10.0.29.228	10.0.29.228
102	10.0.29.229/32	10.0.29.229 – 10.0.29.229	10.0.29.229
103	10.0.29.230/32	10.0.29.230 – 10.0.29.230	10.0.29.230
104	10.0.29.231/32	10.0.29.231 – 10.0.29.231	10.0.29.231
105	10.0.29.232/32	10.0.29.232 – 10.0.29.232	10.0.29.232
106	10.0.29.233/32	10.0.29.233 – 10.0.29.233	10.0.29.233
107	10.0.29.234/32	10.0.29.234 – 10.0.29.234	10.0.29.234
108	10.0.29.235/32	10.0.29.235 – 10.0.29.235	10.0.29.235
109	10.0.29.236/32	10.0.29.236 – 10.0.29.236	10.0.29.236
110	10.0.29.237/32	10.0.29.237 – 10.0.29.237	10.0.29.237
111	10.0.29.238/32	10.0.29.238 – 10.0.29.238	10.0.29.238
112	10.0.29.239/32	10.0.29.239 – 10.0.29.239	10.0.29.239
113	10.0.29.240/32	10.0.29.240 – 10.0.29.240	10.0.29.240
114	10.0.29.241/32	10.0.29.241 – 10.0.29.241	10.0.29.241
115	10.0.29.242/32	10.0.29.242 – 10.0.29.242	10.0.29.242
116	10.0.29.243/32	10.0.29.243 – 10.0.29.243	10.0.29.243
117	10.0.29.244/32	10.0.29.244 – 10.0.29.244	10.0.29.244
118	10.0.29.245/32	10.0.29.245 – 10.0.29.245	10.0.29.245
119	10.0.29.246/32	10.0.29.246 – 10.0.29.246	10.0.29.246
120	10.0.29.247/32	10.0.29.247 – 10.0.29.247	10.0.29.247
121	10.0.29.248/32	10.0.29.248 – 10.0.29.248	10.0.29.248
122	10.0.29.249/32	10.0.29.249 – 10.0.29.249	10.0.29.249
123	10.0.29.250/32	10.0.29.250 – 10.0.29.250	10.0.29.250
124	10.0.29.251/32	10.0.29.251 – 10.0.29.251	10.0.29.251
125	10.0.29.252/32	10.0.29.252 – 10.0.29.252	10.0.29.252
126	10.0.29.253/32	10.0.29.253 – 10.0.29.253	10.0.29.253
127	10.0.29.254/32	10.0.29.254 – 10.0.29.254	10.0.29.254
128	10.0.29.255/32	10.0.29.255 – 10.0.29.255	10.0.29.255

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 →