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)10.2.124.0/24

network10.2.124.0/24

broadcast10.2.124.255

first host10.2.124.1

last host10.2.124.254

subnet mask255.255.255.0

wildcard0.0.0.255

addresses256

usable hosts254

classA

ipcalc 10.2.124.0/24

address00001010.00000010.01111100.00000000

subnet mask11111111.11111111.11111111.00000000

network00001010.00000010.01111100.00000000

broadcast00001010.00000010.01111100.11111111

green = network part, grey = host part

hex0x0a027c00

decimal167934976

reverse dns0.124.2.10.in-addr.arpa

ipv4-mapped::ffff:a02:7c00

/24 split into /31 · 128 subnets

close ×

#	network	host range	broadcast
1	10.2.124.0/31	10.2.124.0 – 10.2.124.1	10.2.124.1
2	10.2.124.2/31	10.2.124.2 – 10.2.124.3	10.2.124.3
3	10.2.124.4/31	10.2.124.4 – 10.2.124.5	10.2.124.5
4	10.2.124.6/31	10.2.124.6 – 10.2.124.7	10.2.124.7
5	10.2.124.8/31	10.2.124.8 – 10.2.124.9	10.2.124.9
6	10.2.124.10/31	10.2.124.10 – 10.2.124.11	10.2.124.11
7	10.2.124.12/31	10.2.124.12 – 10.2.124.13	10.2.124.13
8	10.2.124.14/31	10.2.124.14 – 10.2.124.15	10.2.124.15
9	10.2.124.16/31	10.2.124.16 – 10.2.124.17	10.2.124.17
10	10.2.124.18/31	10.2.124.18 – 10.2.124.19	10.2.124.19
11	10.2.124.20/31	10.2.124.20 – 10.2.124.21	10.2.124.21
12	10.2.124.22/31	10.2.124.22 – 10.2.124.23	10.2.124.23
13	10.2.124.24/31	10.2.124.24 – 10.2.124.25	10.2.124.25
14	10.2.124.26/31	10.2.124.26 – 10.2.124.27	10.2.124.27
15	10.2.124.28/31	10.2.124.28 – 10.2.124.29	10.2.124.29
16	10.2.124.30/31	10.2.124.30 – 10.2.124.31	10.2.124.31
17	10.2.124.32/31	10.2.124.32 – 10.2.124.33	10.2.124.33
18	10.2.124.34/31	10.2.124.34 – 10.2.124.35	10.2.124.35
19	10.2.124.36/31	10.2.124.36 – 10.2.124.37	10.2.124.37
20	10.2.124.38/31	10.2.124.38 – 10.2.124.39	10.2.124.39
21	10.2.124.40/31	10.2.124.40 – 10.2.124.41	10.2.124.41
22	10.2.124.42/31	10.2.124.42 – 10.2.124.43	10.2.124.43
23	10.2.124.44/31	10.2.124.44 – 10.2.124.45	10.2.124.45
24	10.2.124.46/31	10.2.124.46 – 10.2.124.47	10.2.124.47
25	10.2.124.48/31	10.2.124.48 – 10.2.124.49	10.2.124.49
26	10.2.124.50/31	10.2.124.50 – 10.2.124.51	10.2.124.51
27	10.2.124.52/31	10.2.124.52 – 10.2.124.53	10.2.124.53
28	10.2.124.54/31	10.2.124.54 – 10.2.124.55	10.2.124.55
29	10.2.124.56/31	10.2.124.56 – 10.2.124.57	10.2.124.57
30	10.2.124.58/31	10.2.124.58 – 10.2.124.59	10.2.124.59
31	10.2.124.60/31	10.2.124.60 – 10.2.124.61	10.2.124.61
32	10.2.124.62/31	10.2.124.62 – 10.2.124.63	10.2.124.63
33	10.2.124.64/31	10.2.124.64 – 10.2.124.65	10.2.124.65
34	10.2.124.66/31	10.2.124.66 – 10.2.124.67	10.2.124.67
35	10.2.124.68/31	10.2.124.68 – 10.2.124.69	10.2.124.69
36	10.2.124.70/31	10.2.124.70 – 10.2.124.71	10.2.124.71
37	10.2.124.72/31	10.2.124.72 – 10.2.124.73	10.2.124.73
38	10.2.124.74/31	10.2.124.74 – 10.2.124.75	10.2.124.75
39	10.2.124.76/31	10.2.124.76 – 10.2.124.77	10.2.124.77
40	10.2.124.78/31	10.2.124.78 – 10.2.124.79	10.2.124.79
41	10.2.124.80/31	10.2.124.80 – 10.2.124.81	10.2.124.81
42	10.2.124.82/31	10.2.124.82 – 10.2.124.83	10.2.124.83
43	10.2.124.84/31	10.2.124.84 – 10.2.124.85	10.2.124.85
44	10.2.124.86/31	10.2.124.86 – 10.2.124.87	10.2.124.87
45	10.2.124.88/31	10.2.124.88 – 10.2.124.89	10.2.124.89
46	10.2.124.90/31	10.2.124.90 – 10.2.124.91	10.2.124.91
47	10.2.124.92/31	10.2.124.92 – 10.2.124.93	10.2.124.93
48	10.2.124.94/31	10.2.124.94 – 10.2.124.95	10.2.124.95
49	10.2.124.96/31	10.2.124.96 – 10.2.124.97	10.2.124.97
50	10.2.124.98/31	10.2.124.98 – 10.2.124.99	10.2.124.99
51	10.2.124.100/31	10.2.124.100 – 10.2.124.101	10.2.124.101
52	10.2.124.102/31	10.2.124.102 – 10.2.124.103	10.2.124.103
53	10.2.124.104/31	10.2.124.104 – 10.2.124.105	10.2.124.105
54	10.2.124.106/31	10.2.124.106 – 10.2.124.107	10.2.124.107
55	10.2.124.108/31	10.2.124.108 – 10.2.124.109	10.2.124.109
56	10.2.124.110/31	10.2.124.110 – 10.2.124.111	10.2.124.111
57	10.2.124.112/31	10.2.124.112 – 10.2.124.113	10.2.124.113
58	10.2.124.114/31	10.2.124.114 – 10.2.124.115	10.2.124.115
59	10.2.124.116/31	10.2.124.116 – 10.2.124.117	10.2.124.117
60	10.2.124.118/31	10.2.124.118 – 10.2.124.119	10.2.124.119
61	10.2.124.120/31	10.2.124.120 – 10.2.124.121	10.2.124.121
62	10.2.124.122/31	10.2.124.122 – 10.2.124.123	10.2.124.123
63	10.2.124.124/31	10.2.124.124 – 10.2.124.125	10.2.124.125
64	10.2.124.126/31	10.2.124.126 – 10.2.124.127	10.2.124.127
65	10.2.124.128/31	10.2.124.128 – 10.2.124.129	10.2.124.129
66	10.2.124.130/31	10.2.124.130 – 10.2.124.131	10.2.124.131
67	10.2.124.132/31	10.2.124.132 – 10.2.124.133	10.2.124.133
68	10.2.124.134/31	10.2.124.134 – 10.2.124.135	10.2.124.135
69	10.2.124.136/31	10.2.124.136 – 10.2.124.137	10.2.124.137
70	10.2.124.138/31	10.2.124.138 – 10.2.124.139	10.2.124.139
71	10.2.124.140/31	10.2.124.140 – 10.2.124.141	10.2.124.141
72	10.2.124.142/31	10.2.124.142 – 10.2.124.143	10.2.124.143
73	10.2.124.144/31	10.2.124.144 – 10.2.124.145	10.2.124.145
74	10.2.124.146/31	10.2.124.146 – 10.2.124.147	10.2.124.147
75	10.2.124.148/31	10.2.124.148 – 10.2.124.149	10.2.124.149
76	10.2.124.150/31	10.2.124.150 – 10.2.124.151	10.2.124.151
77	10.2.124.152/31	10.2.124.152 – 10.2.124.153	10.2.124.153
78	10.2.124.154/31	10.2.124.154 – 10.2.124.155	10.2.124.155
79	10.2.124.156/31	10.2.124.156 – 10.2.124.157	10.2.124.157
80	10.2.124.158/31	10.2.124.158 – 10.2.124.159	10.2.124.159
81	10.2.124.160/31	10.2.124.160 – 10.2.124.161	10.2.124.161
82	10.2.124.162/31	10.2.124.162 – 10.2.124.163	10.2.124.163
83	10.2.124.164/31	10.2.124.164 – 10.2.124.165	10.2.124.165
84	10.2.124.166/31	10.2.124.166 – 10.2.124.167	10.2.124.167
85	10.2.124.168/31	10.2.124.168 – 10.2.124.169	10.2.124.169
86	10.2.124.170/31	10.2.124.170 – 10.2.124.171	10.2.124.171
87	10.2.124.172/31	10.2.124.172 – 10.2.124.173	10.2.124.173
88	10.2.124.174/31	10.2.124.174 – 10.2.124.175	10.2.124.175
89	10.2.124.176/31	10.2.124.176 – 10.2.124.177	10.2.124.177
90	10.2.124.178/31	10.2.124.178 – 10.2.124.179	10.2.124.179
91	10.2.124.180/31	10.2.124.180 – 10.2.124.181	10.2.124.181
92	10.2.124.182/31	10.2.124.182 – 10.2.124.183	10.2.124.183
93	10.2.124.184/31	10.2.124.184 – 10.2.124.185	10.2.124.185
94	10.2.124.186/31	10.2.124.186 – 10.2.124.187	10.2.124.187
95	10.2.124.188/31	10.2.124.188 – 10.2.124.189	10.2.124.189
96	10.2.124.190/31	10.2.124.190 – 10.2.124.191	10.2.124.191
97	10.2.124.192/31	10.2.124.192 – 10.2.124.193	10.2.124.193
98	10.2.124.194/31	10.2.124.194 – 10.2.124.195	10.2.124.195
99	10.2.124.196/31	10.2.124.196 – 10.2.124.197	10.2.124.197
100	10.2.124.198/31	10.2.124.198 – 10.2.124.199	10.2.124.199
101	10.2.124.200/31	10.2.124.200 – 10.2.124.201	10.2.124.201
102	10.2.124.202/31	10.2.124.202 – 10.2.124.203	10.2.124.203
103	10.2.124.204/31	10.2.124.204 – 10.2.124.205	10.2.124.205
104	10.2.124.206/31	10.2.124.206 – 10.2.124.207	10.2.124.207
105	10.2.124.208/31	10.2.124.208 – 10.2.124.209	10.2.124.209
106	10.2.124.210/31	10.2.124.210 – 10.2.124.211	10.2.124.211
107	10.2.124.212/31	10.2.124.212 – 10.2.124.213	10.2.124.213
108	10.2.124.214/31	10.2.124.214 – 10.2.124.215	10.2.124.215
109	10.2.124.216/31	10.2.124.216 – 10.2.124.217	10.2.124.217
110	10.2.124.218/31	10.2.124.218 – 10.2.124.219	10.2.124.219
111	10.2.124.220/31	10.2.124.220 – 10.2.124.221	10.2.124.221
112	10.2.124.222/31	10.2.124.222 – 10.2.124.223	10.2.124.223
113	10.2.124.224/31	10.2.124.224 – 10.2.124.225	10.2.124.225
114	10.2.124.226/31	10.2.124.226 – 10.2.124.227	10.2.124.227
115	10.2.124.228/31	10.2.124.228 – 10.2.124.229	10.2.124.229
116	10.2.124.230/31	10.2.124.230 – 10.2.124.231	10.2.124.231
117	10.2.124.232/31	10.2.124.232 – 10.2.124.233	10.2.124.233
118	10.2.124.234/31	10.2.124.234 – 10.2.124.235	10.2.124.235
119	10.2.124.236/31	10.2.124.236 – 10.2.124.237	10.2.124.237
120	10.2.124.238/31	10.2.124.238 – 10.2.124.239	10.2.124.239
121	10.2.124.240/31	10.2.124.240 – 10.2.124.241	10.2.124.241
122	10.2.124.242/31	10.2.124.242 – 10.2.124.243	10.2.124.243
123	10.2.124.244/31	10.2.124.244 – 10.2.124.245	10.2.124.245
124	10.2.124.246/31	10.2.124.246 – 10.2.124.247	10.2.124.247
125	10.2.124.248/31	10.2.124.248 – 10.2.124.249	10.2.124.249
126	10.2.124.250/31	10.2.124.250 – 10.2.124.251	10.2.124.251
127	10.2.124.252/31	10.2.124.252 – 10.2.124.253	10.2.124.253
128	10.2.124.254/31	10.2.124.254 – 10.2.124.255	10.2.124.255

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 /24
/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	1
/25	255.255.255.128	128	126	2 split →
/26	255.255.255.192	64	62	4 split →
/27	255.255.255.224	32	30	8 split →
/28	255.255.255.240	16	14	16 split →
/29	255.255.255.248	8	6	32 split →
/30	255.255.255.252	4	2	64 split →
/31	255.255.255.254	2	2	128 split →
/32	255.255.255.255	1	1	256 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 →