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)10.2.74.128/25

network10.2.74.128/25

broadcast10.2.74.255

first host10.2.74.129

last host10.2.74.254

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.2.74.128/25

address00001010.00000010.01001010.10000000

subnet mask11111111.11111111.11111111.10000000

network00001010.00000010.01001010.10000000

broadcast00001010.00000010.01001010.11111111

green = network part, grey = host part

hex0x0a024a80

decimal167922304

reverse dns128.74.2.10.in-addr.arpa

ipv4-mapped::ffff:a02:4a80

/25 split into /32 · 128 subnets

close ×

#	network	host range	broadcast
1	10.2.74.128/32	10.2.74.128 – 10.2.74.128	10.2.74.128
2	10.2.74.129/32	10.2.74.129 – 10.2.74.129	10.2.74.129
3	10.2.74.130/32	10.2.74.130 – 10.2.74.130	10.2.74.130
4	10.2.74.131/32	10.2.74.131 – 10.2.74.131	10.2.74.131
5	10.2.74.132/32	10.2.74.132 – 10.2.74.132	10.2.74.132
6	10.2.74.133/32	10.2.74.133 – 10.2.74.133	10.2.74.133
7	10.2.74.134/32	10.2.74.134 – 10.2.74.134	10.2.74.134
8	10.2.74.135/32	10.2.74.135 – 10.2.74.135	10.2.74.135
9	10.2.74.136/32	10.2.74.136 – 10.2.74.136	10.2.74.136
10	10.2.74.137/32	10.2.74.137 – 10.2.74.137	10.2.74.137
11	10.2.74.138/32	10.2.74.138 – 10.2.74.138	10.2.74.138
12	10.2.74.139/32	10.2.74.139 – 10.2.74.139	10.2.74.139
13	10.2.74.140/32	10.2.74.140 – 10.2.74.140	10.2.74.140
14	10.2.74.141/32	10.2.74.141 – 10.2.74.141	10.2.74.141
15	10.2.74.142/32	10.2.74.142 – 10.2.74.142	10.2.74.142
16	10.2.74.143/32	10.2.74.143 – 10.2.74.143	10.2.74.143
17	10.2.74.144/32	10.2.74.144 – 10.2.74.144	10.2.74.144
18	10.2.74.145/32	10.2.74.145 – 10.2.74.145	10.2.74.145
19	10.2.74.146/32	10.2.74.146 – 10.2.74.146	10.2.74.146
20	10.2.74.147/32	10.2.74.147 – 10.2.74.147	10.2.74.147
21	10.2.74.148/32	10.2.74.148 – 10.2.74.148	10.2.74.148
22	10.2.74.149/32	10.2.74.149 – 10.2.74.149	10.2.74.149
23	10.2.74.150/32	10.2.74.150 – 10.2.74.150	10.2.74.150
24	10.2.74.151/32	10.2.74.151 – 10.2.74.151	10.2.74.151
25	10.2.74.152/32	10.2.74.152 – 10.2.74.152	10.2.74.152
26	10.2.74.153/32	10.2.74.153 – 10.2.74.153	10.2.74.153
27	10.2.74.154/32	10.2.74.154 – 10.2.74.154	10.2.74.154
28	10.2.74.155/32	10.2.74.155 – 10.2.74.155	10.2.74.155
29	10.2.74.156/32	10.2.74.156 – 10.2.74.156	10.2.74.156
30	10.2.74.157/32	10.2.74.157 – 10.2.74.157	10.2.74.157
31	10.2.74.158/32	10.2.74.158 – 10.2.74.158	10.2.74.158
32	10.2.74.159/32	10.2.74.159 – 10.2.74.159	10.2.74.159
33	10.2.74.160/32	10.2.74.160 – 10.2.74.160	10.2.74.160
34	10.2.74.161/32	10.2.74.161 – 10.2.74.161	10.2.74.161
35	10.2.74.162/32	10.2.74.162 – 10.2.74.162	10.2.74.162
36	10.2.74.163/32	10.2.74.163 – 10.2.74.163	10.2.74.163
37	10.2.74.164/32	10.2.74.164 – 10.2.74.164	10.2.74.164
38	10.2.74.165/32	10.2.74.165 – 10.2.74.165	10.2.74.165
39	10.2.74.166/32	10.2.74.166 – 10.2.74.166	10.2.74.166
40	10.2.74.167/32	10.2.74.167 – 10.2.74.167	10.2.74.167
41	10.2.74.168/32	10.2.74.168 – 10.2.74.168	10.2.74.168
42	10.2.74.169/32	10.2.74.169 – 10.2.74.169	10.2.74.169
43	10.2.74.170/32	10.2.74.170 – 10.2.74.170	10.2.74.170
44	10.2.74.171/32	10.2.74.171 – 10.2.74.171	10.2.74.171
45	10.2.74.172/32	10.2.74.172 – 10.2.74.172	10.2.74.172
46	10.2.74.173/32	10.2.74.173 – 10.2.74.173	10.2.74.173
47	10.2.74.174/32	10.2.74.174 – 10.2.74.174	10.2.74.174
48	10.2.74.175/32	10.2.74.175 – 10.2.74.175	10.2.74.175
49	10.2.74.176/32	10.2.74.176 – 10.2.74.176	10.2.74.176
50	10.2.74.177/32	10.2.74.177 – 10.2.74.177	10.2.74.177
51	10.2.74.178/32	10.2.74.178 – 10.2.74.178	10.2.74.178
52	10.2.74.179/32	10.2.74.179 – 10.2.74.179	10.2.74.179
53	10.2.74.180/32	10.2.74.180 – 10.2.74.180	10.2.74.180
54	10.2.74.181/32	10.2.74.181 – 10.2.74.181	10.2.74.181
55	10.2.74.182/32	10.2.74.182 – 10.2.74.182	10.2.74.182
56	10.2.74.183/32	10.2.74.183 – 10.2.74.183	10.2.74.183
57	10.2.74.184/32	10.2.74.184 – 10.2.74.184	10.2.74.184
58	10.2.74.185/32	10.2.74.185 – 10.2.74.185	10.2.74.185
59	10.2.74.186/32	10.2.74.186 – 10.2.74.186	10.2.74.186
60	10.2.74.187/32	10.2.74.187 – 10.2.74.187	10.2.74.187
61	10.2.74.188/32	10.2.74.188 – 10.2.74.188	10.2.74.188
62	10.2.74.189/32	10.2.74.189 – 10.2.74.189	10.2.74.189
63	10.2.74.190/32	10.2.74.190 – 10.2.74.190	10.2.74.190
64	10.2.74.191/32	10.2.74.191 – 10.2.74.191	10.2.74.191
65	10.2.74.192/32	10.2.74.192 – 10.2.74.192	10.2.74.192
66	10.2.74.193/32	10.2.74.193 – 10.2.74.193	10.2.74.193
67	10.2.74.194/32	10.2.74.194 – 10.2.74.194	10.2.74.194
68	10.2.74.195/32	10.2.74.195 – 10.2.74.195	10.2.74.195
69	10.2.74.196/32	10.2.74.196 – 10.2.74.196	10.2.74.196
70	10.2.74.197/32	10.2.74.197 – 10.2.74.197	10.2.74.197
71	10.2.74.198/32	10.2.74.198 – 10.2.74.198	10.2.74.198
72	10.2.74.199/32	10.2.74.199 – 10.2.74.199	10.2.74.199
73	10.2.74.200/32	10.2.74.200 – 10.2.74.200	10.2.74.200
74	10.2.74.201/32	10.2.74.201 – 10.2.74.201	10.2.74.201
75	10.2.74.202/32	10.2.74.202 – 10.2.74.202	10.2.74.202
76	10.2.74.203/32	10.2.74.203 – 10.2.74.203	10.2.74.203
77	10.2.74.204/32	10.2.74.204 – 10.2.74.204	10.2.74.204
78	10.2.74.205/32	10.2.74.205 – 10.2.74.205	10.2.74.205
79	10.2.74.206/32	10.2.74.206 – 10.2.74.206	10.2.74.206
80	10.2.74.207/32	10.2.74.207 – 10.2.74.207	10.2.74.207
81	10.2.74.208/32	10.2.74.208 – 10.2.74.208	10.2.74.208
82	10.2.74.209/32	10.2.74.209 – 10.2.74.209	10.2.74.209
83	10.2.74.210/32	10.2.74.210 – 10.2.74.210	10.2.74.210
84	10.2.74.211/32	10.2.74.211 – 10.2.74.211	10.2.74.211
85	10.2.74.212/32	10.2.74.212 – 10.2.74.212	10.2.74.212
86	10.2.74.213/32	10.2.74.213 – 10.2.74.213	10.2.74.213
87	10.2.74.214/32	10.2.74.214 – 10.2.74.214	10.2.74.214
88	10.2.74.215/32	10.2.74.215 – 10.2.74.215	10.2.74.215
89	10.2.74.216/32	10.2.74.216 – 10.2.74.216	10.2.74.216
90	10.2.74.217/32	10.2.74.217 – 10.2.74.217	10.2.74.217
91	10.2.74.218/32	10.2.74.218 – 10.2.74.218	10.2.74.218
92	10.2.74.219/32	10.2.74.219 – 10.2.74.219	10.2.74.219
93	10.2.74.220/32	10.2.74.220 – 10.2.74.220	10.2.74.220
94	10.2.74.221/32	10.2.74.221 – 10.2.74.221	10.2.74.221
95	10.2.74.222/32	10.2.74.222 – 10.2.74.222	10.2.74.222
96	10.2.74.223/32	10.2.74.223 – 10.2.74.223	10.2.74.223
97	10.2.74.224/32	10.2.74.224 – 10.2.74.224	10.2.74.224
98	10.2.74.225/32	10.2.74.225 – 10.2.74.225	10.2.74.225
99	10.2.74.226/32	10.2.74.226 – 10.2.74.226	10.2.74.226
100	10.2.74.227/32	10.2.74.227 – 10.2.74.227	10.2.74.227
101	10.2.74.228/32	10.2.74.228 – 10.2.74.228	10.2.74.228
102	10.2.74.229/32	10.2.74.229 – 10.2.74.229	10.2.74.229
103	10.2.74.230/32	10.2.74.230 – 10.2.74.230	10.2.74.230
104	10.2.74.231/32	10.2.74.231 – 10.2.74.231	10.2.74.231
105	10.2.74.232/32	10.2.74.232 – 10.2.74.232	10.2.74.232
106	10.2.74.233/32	10.2.74.233 – 10.2.74.233	10.2.74.233
107	10.2.74.234/32	10.2.74.234 – 10.2.74.234	10.2.74.234
108	10.2.74.235/32	10.2.74.235 – 10.2.74.235	10.2.74.235
109	10.2.74.236/32	10.2.74.236 – 10.2.74.236	10.2.74.236
110	10.2.74.237/32	10.2.74.237 – 10.2.74.237	10.2.74.237
111	10.2.74.238/32	10.2.74.238 – 10.2.74.238	10.2.74.238
112	10.2.74.239/32	10.2.74.239 – 10.2.74.239	10.2.74.239
113	10.2.74.240/32	10.2.74.240 – 10.2.74.240	10.2.74.240
114	10.2.74.241/32	10.2.74.241 – 10.2.74.241	10.2.74.241
115	10.2.74.242/32	10.2.74.242 – 10.2.74.242	10.2.74.242
116	10.2.74.243/32	10.2.74.243 – 10.2.74.243	10.2.74.243
117	10.2.74.244/32	10.2.74.244 – 10.2.74.244	10.2.74.244
118	10.2.74.245/32	10.2.74.245 – 10.2.74.245	10.2.74.245
119	10.2.74.246/32	10.2.74.246 – 10.2.74.246	10.2.74.246
120	10.2.74.247/32	10.2.74.247 – 10.2.74.247	10.2.74.247
121	10.2.74.248/32	10.2.74.248 – 10.2.74.248	10.2.74.248
122	10.2.74.249/32	10.2.74.249 – 10.2.74.249	10.2.74.249
123	10.2.74.250/32	10.2.74.250 – 10.2.74.250	10.2.74.250
124	10.2.74.251/32	10.2.74.251 – 10.2.74.251	10.2.74.251
125	10.2.74.252/32	10.2.74.252 – 10.2.74.252	10.2.74.252
126	10.2.74.253/32	10.2.74.253 – 10.2.74.253	10.2.74.253
127	10.2.74.254/32	10.2.74.254 – 10.2.74.254	10.2.74.254
128	10.2.74.255/32	10.2.74.255 – 10.2.74.255	10.2.74.255

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 →