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)10.71.84.0/24

network10.71.84.0/24

broadcast10.71.84.255

first host10.71.84.1

last host10.71.84.254

subnet mask255.255.255.0

wildcard0.0.0.255

addresses256

usable hosts254

classA

ipcalc 10.71.84.0/24

address00001010.01000111.01010100.00000000

subnet mask11111111.11111111.11111111.00000000

network00001010.01000111.01010100.00000000

broadcast00001010.01000111.01010100.11111111

green = network part, grey = host part

hex0x0a475400

decimal172446720

reverse dns0.84.71.10.in-addr.arpa

ipv4-mapped::ffff:a47:5400

/24 split into /31 · 128 subnets

close ×

#	network	host range	broadcast
1	10.71.84.0/31	10.71.84.0 – 10.71.84.1	10.71.84.1
2	10.71.84.2/31	10.71.84.2 – 10.71.84.3	10.71.84.3
3	10.71.84.4/31	10.71.84.4 – 10.71.84.5	10.71.84.5
4	10.71.84.6/31	10.71.84.6 – 10.71.84.7	10.71.84.7
5	10.71.84.8/31	10.71.84.8 – 10.71.84.9	10.71.84.9
6	10.71.84.10/31	10.71.84.10 – 10.71.84.11	10.71.84.11
7	10.71.84.12/31	10.71.84.12 – 10.71.84.13	10.71.84.13
8	10.71.84.14/31	10.71.84.14 – 10.71.84.15	10.71.84.15
9	10.71.84.16/31	10.71.84.16 – 10.71.84.17	10.71.84.17
10	10.71.84.18/31	10.71.84.18 – 10.71.84.19	10.71.84.19
11	10.71.84.20/31	10.71.84.20 – 10.71.84.21	10.71.84.21
12	10.71.84.22/31	10.71.84.22 – 10.71.84.23	10.71.84.23
13	10.71.84.24/31	10.71.84.24 – 10.71.84.25	10.71.84.25
14	10.71.84.26/31	10.71.84.26 – 10.71.84.27	10.71.84.27
15	10.71.84.28/31	10.71.84.28 – 10.71.84.29	10.71.84.29
16	10.71.84.30/31	10.71.84.30 – 10.71.84.31	10.71.84.31
17	10.71.84.32/31	10.71.84.32 – 10.71.84.33	10.71.84.33
18	10.71.84.34/31	10.71.84.34 – 10.71.84.35	10.71.84.35
19	10.71.84.36/31	10.71.84.36 – 10.71.84.37	10.71.84.37
20	10.71.84.38/31	10.71.84.38 – 10.71.84.39	10.71.84.39
21	10.71.84.40/31	10.71.84.40 – 10.71.84.41	10.71.84.41
22	10.71.84.42/31	10.71.84.42 – 10.71.84.43	10.71.84.43
23	10.71.84.44/31	10.71.84.44 – 10.71.84.45	10.71.84.45
24	10.71.84.46/31	10.71.84.46 – 10.71.84.47	10.71.84.47
25	10.71.84.48/31	10.71.84.48 – 10.71.84.49	10.71.84.49
26	10.71.84.50/31	10.71.84.50 – 10.71.84.51	10.71.84.51
27	10.71.84.52/31	10.71.84.52 – 10.71.84.53	10.71.84.53
28	10.71.84.54/31	10.71.84.54 – 10.71.84.55	10.71.84.55
29	10.71.84.56/31	10.71.84.56 – 10.71.84.57	10.71.84.57
30	10.71.84.58/31	10.71.84.58 – 10.71.84.59	10.71.84.59
31	10.71.84.60/31	10.71.84.60 – 10.71.84.61	10.71.84.61
32	10.71.84.62/31	10.71.84.62 – 10.71.84.63	10.71.84.63
33	10.71.84.64/31	10.71.84.64 – 10.71.84.65	10.71.84.65
34	10.71.84.66/31	10.71.84.66 – 10.71.84.67	10.71.84.67
35	10.71.84.68/31	10.71.84.68 – 10.71.84.69	10.71.84.69
36	10.71.84.70/31	10.71.84.70 – 10.71.84.71	10.71.84.71
37	10.71.84.72/31	10.71.84.72 – 10.71.84.73	10.71.84.73
38	10.71.84.74/31	10.71.84.74 – 10.71.84.75	10.71.84.75
39	10.71.84.76/31	10.71.84.76 – 10.71.84.77	10.71.84.77
40	10.71.84.78/31	10.71.84.78 – 10.71.84.79	10.71.84.79
41	10.71.84.80/31	10.71.84.80 – 10.71.84.81	10.71.84.81
42	10.71.84.82/31	10.71.84.82 – 10.71.84.83	10.71.84.83
43	10.71.84.84/31	10.71.84.84 – 10.71.84.85	10.71.84.85
44	10.71.84.86/31	10.71.84.86 – 10.71.84.87	10.71.84.87
45	10.71.84.88/31	10.71.84.88 – 10.71.84.89	10.71.84.89
46	10.71.84.90/31	10.71.84.90 – 10.71.84.91	10.71.84.91
47	10.71.84.92/31	10.71.84.92 – 10.71.84.93	10.71.84.93
48	10.71.84.94/31	10.71.84.94 – 10.71.84.95	10.71.84.95
49	10.71.84.96/31	10.71.84.96 – 10.71.84.97	10.71.84.97
50	10.71.84.98/31	10.71.84.98 – 10.71.84.99	10.71.84.99
51	10.71.84.100/31	10.71.84.100 – 10.71.84.101	10.71.84.101
52	10.71.84.102/31	10.71.84.102 – 10.71.84.103	10.71.84.103
53	10.71.84.104/31	10.71.84.104 – 10.71.84.105	10.71.84.105
54	10.71.84.106/31	10.71.84.106 – 10.71.84.107	10.71.84.107
55	10.71.84.108/31	10.71.84.108 – 10.71.84.109	10.71.84.109
56	10.71.84.110/31	10.71.84.110 – 10.71.84.111	10.71.84.111
57	10.71.84.112/31	10.71.84.112 – 10.71.84.113	10.71.84.113
58	10.71.84.114/31	10.71.84.114 – 10.71.84.115	10.71.84.115
59	10.71.84.116/31	10.71.84.116 – 10.71.84.117	10.71.84.117
60	10.71.84.118/31	10.71.84.118 – 10.71.84.119	10.71.84.119
61	10.71.84.120/31	10.71.84.120 – 10.71.84.121	10.71.84.121
62	10.71.84.122/31	10.71.84.122 – 10.71.84.123	10.71.84.123
63	10.71.84.124/31	10.71.84.124 – 10.71.84.125	10.71.84.125
64	10.71.84.126/31	10.71.84.126 – 10.71.84.127	10.71.84.127
65	10.71.84.128/31	10.71.84.128 – 10.71.84.129	10.71.84.129
66	10.71.84.130/31	10.71.84.130 – 10.71.84.131	10.71.84.131
67	10.71.84.132/31	10.71.84.132 – 10.71.84.133	10.71.84.133
68	10.71.84.134/31	10.71.84.134 – 10.71.84.135	10.71.84.135
69	10.71.84.136/31	10.71.84.136 – 10.71.84.137	10.71.84.137
70	10.71.84.138/31	10.71.84.138 – 10.71.84.139	10.71.84.139
71	10.71.84.140/31	10.71.84.140 – 10.71.84.141	10.71.84.141
72	10.71.84.142/31	10.71.84.142 – 10.71.84.143	10.71.84.143
73	10.71.84.144/31	10.71.84.144 – 10.71.84.145	10.71.84.145
74	10.71.84.146/31	10.71.84.146 – 10.71.84.147	10.71.84.147
75	10.71.84.148/31	10.71.84.148 – 10.71.84.149	10.71.84.149
76	10.71.84.150/31	10.71.84.150 – 10.71.84.151	10.71.84.151
77	10.71.84.152/31	10.71.84.152 – 10.71.84.153	10.71.84.153
78	10.71.84.154/31	10.71.84.154 – 10.71.84.155	10.71.84.155
79	10.71.84.156/31	10.71.84.156 – 10.71.84.157	10.71.84.157
80	10.71.84.158/31	10.71.84.158 – 10.71.84.159	10.71.84.159
81	10.71.84.160/31	10.71.84.160 – 10.71.84.161	10.71.84.161
82	10.71.84.162/31	10.71.84.162 – 10.71.84.163	10.71.84.163
83	10.71.84.164/31	10.71.84.164 – 10.71.84.165	10.71.84.165
84	10.71.84.166/31	10.71.84.166 – 10.71.84.167	10.71.84.167
85	10.71.84.168/31	10.71.84.168 – 10.71.84.169	10.71.84.169
86	10.71.84.170/31	10.71.84.170 – 10.71.84.171	10.71.84.171
87	10.71.84.172/31	10.71.84.172 – 10.71.84.173	10.71.84.173
88	10.71.84.174/31	10.71.84.174 – 10.71.84.175	10.71.84.175
89	10.71.84.176/31	10.71.84.176 – 10.71.84.177	10.71.84.177
90	10.71.84.178/31	10.71.84.178 – 10.71.84.179	10.71.84.179
91	10.71.84.180/31	10.71.84.180 – 10.71.84.181	10.71.84.181
92	10.71.84.182/31	10.71.84.182 – 10.71.84.183	10.71.84.183
93	10.71.84.184/31	10.71.84.184 – 10.71.84.185	10.71.84.185
94	10.71.84.186/31	10.71.84.186 – 10.71.84.187	10.71.84.187
95	10.71.84.188/31	10.71.84.188 – 10.71.84.189	10.71.84.189
96	10.71.84.190/31	10.71.84.190 – 10.71.84.191	10.71.84.191
97	10.71.84.192/31	10.71.84.192 – 10.71.84.193	10.71.84.193
98	10.71.84.194/31	10.71.84.194 – 10.71.84.195	10.71.84.195
99	10.71.84.196/31	10.71.84.196 – 10.71.84.197	10.71.84.197
100	10.71.84.198/31	10.71.84.198 – 10.71.84.199	10.71.84.199
101	10.71.84.200/31	10.71.84.200 – 10.71.84.201	10.71.84.201
102	10.71.84.202/31	10.71.84.202 – 10.71.84.203	10.71.84.203
103	10.71.84.204/31	10.71.84.204 – 10.71.84.205	10.71.84.205
104	10.71.84.206/31	10.71.84.206 – 10.71.84.207	10.71.84.207
105	10.71.84.208/31	10.71.84.208 – 10.71.84.209	10.71.84.209
106	10.71.84.210/31	10.71.84.210 – 10.71.84.211	10.71.84.211
107	10.71.84.212/31	10.71.84.212 – 10.71.84.213	10.71.84.213
108	10.71.84.214/31	10.71.84.214 – 10.71.84.215	10.71.84.215
109	10.71.84.216/31	10.71.84.216 – 10.71.84.217	10.71.84.217
110	10.71.84.218/31	10.71.84.218 – 10.71.84.219	10.71.84.219
111	10.71.84.220/31	10.71.84.220 – 10.71.84.221	10.71.84.221
112	10.71.84.222/31	10.71.84.222 – 10.71.84.223	10.71.84.223
113	10.71.84.224/31	10.71.84.224 – 10.71.84.225	10.71.84.225
114	10.71.84.226/31	10.71.84.226 – 10.71.84.227	10.71.84.227
115	10.71.84.228/31	10.71.84.228 – 10.71.84.229	10.71.84.229
116	10.71.84.230/31	10.71.84.230 – 10.71.84.231	10.71.84.231
117	10.71.84.232/31	10.71.84.232 – 10.71.84.233	10.71.84.233
118	10.71.84.234/31	10.71.84.234 – 10.71.84.235	10.71.84.235
119	10.71.84.236/31	10.71.84.236 – 10.71.84.237	10.71.84.237
120	10.71.84.238/31	10.71.84.238 – 10.71.84.239	10.71.84.239
121	10.71.84.240/31	10.71.84.240 – 10.71.84.241	10.71.84.241
122	10.71.84.242/31	10.71.84.242 – 10.71.84.243	10.71.84.243
123	10.71.84.244/31	10.71.84.244 – 10.71.84.245	10.71.84.245
124	10.71.84.246/31	10.71.84.246 – 10.71.84.247	10.71.84.247
125	10.71.84.248/31	10.71.84.248 – 10.71.84.249	10.71.84.249
126	10.71.84.250/31	10.71.84.250 – 10.71.84.251	10.71.84.251
127	10.71.84.252/31	10.71.84.252 – 10.71.84.253	10.71.84.253
128	10.71.84.254/31	10.71.84.254 – 10.71.84.255	10.71.84.255

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 →