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)10.0.143.0/24

network10.0.143.0/24

broadcast10.0.143.255

first host10.0.143.1

last host10.0.143.254

subnet mask255.255.255.0

wildcard0.0.0.255

addresses256

usable hosts254

classA

ipcalc 10.0.143.0/24

address00001010.00000000.10001111.00000000

subnet mask11111111.11111111.11111111.00000000

network00001010.00000000.10001111.00000000

broadcast00001010.00000000.10001111.11111111

green = network part, grey = host part

hex0x0a008f00

decimal167808768

reverse dns0.143.0.10.in-addr.arpa

ipv4-mapped::ffff:a00:8f00

/24 split into /31 · 128 subnets

close ×

#	network	host range	broadcast
1	10.0.143.0/31	10.0.143.0 – 10.0.143.1	10.0.143.1
2	10.0.143.2/31	10.0.143.2 – 10.0.143.3	10.0.143.3
3	10.0.143.4/31	10.0.143.4 – 10.0.143.5	10.0.143.5
4	10.0.143.6/31	10.0.143.6 – 10.0.143.7	10.0.143.7
5	10.0.143.8/31	10.0.143.8 – 10.0.143.9	10.0.143.9
6	10.0.143.10/31	10.0.143.10 – 10.0.143.11	10.0.143.11
7	10.0.143.12/31	10.0.143.12 – 10.0.143.13	10.0.143.13
8	10.0.143.14/31	10.0.143.14 – 10.0.143.15	10.0.143.15
9	10.0.143.16/31	10.0.143.16 – 10.0.143.17	10.0.143.17
10	10.0.143.18/31	10.0.143.18 – 10.0.143.19	10.0.143.19
11	10.0.143.20/31	10.0.143.20 – 10.0.143.21	10.0.143.21
12	10.0.143.22/31	10.0.143.22 – 10.0.143.23	10.0.143.23
13	10.0.143.24/31	10.0.143.24 – 10.0.143.25	10.0.143.25
14	10.0.143.26/31	10.0.143.26 – 10.0.143.27	10.0.143.27
15	10.0.143.28/31	10.0.143.28 – 10.0.143.29	10.0.143.29
16	10.0.143.30/31	10.0.143.30 – 10.0.143.31	10.0.143.31
17	10.0.143.32/31	10.0.143.32 – 10.0.143.33	10.0.143.33
18	10.0.143.34/31	10.0.143.34 – 10.0.143.35	10.0.143.35
19	10.0.143.36/31	10.0.143.36 – 10.0.143.37	10.0.143.37
20	10.0.143.38/31	10.0.143.38 – 10.0.143.39	10.0.143.39
21	10.0.143.40/31	10.0.143.40 – 10.0.143.41	10.0.143.41
22	10.0.143.42/31	10.0.143.42 – 10.0.143.43	10.0.143.43
23	10.0.143.44/31	10.0.143.44 – 10.0.143.45	10.0.143.45
24	10.0.143.46/31	10.0.143.46 – 10.0.143.47	10.0.143.47
25	10.0.143.48/31	10.0.143.48 – 10.0.143.49	10.0.143.49
26	10.0.143.50/31	10.0.143.50 – 10.0.143.51	10.0.143.51
27	10.0.143.52/31	10.0.143.52 – 10.0.143.53	10.0.143.53
28	10.0.143.54/31	10.0.143.54 – 10.0.143.55	10.0.143.55
29	10.0.143.56/31	10.0.143.56 – 10.0.143.57	10.0.143.57
30	10.0.143.58/31	10.0.143.58 – 10.0.143.59	10.0.143.59
31	10.0.143.60/31	10.0.143.60 – 10.0.143.61	10.0.143.61
32	10.0.143.62/31	10.0.143.62 – 10.0.143.63	10.0.143.63
33	10.0.143.64/31	10.0.143.64 – 10.0.143.65	10.0.143.65
34	10.0.143.66/31	10.0.143.66 – 10.0.143.67	10.0.143.67
35	10.0.143.68/31	10.0.143.68 – 10.0.143.69	10.0.143.69
36	10.0.143.70/31	10.0.143.70 – 10.0.143.71	10.0.143.71
37	10.0.143.72/31	10.0.143.72 – 10.0.143.73	10.0.143.73
38	10.0.143.74/31	10.0.143.74 – 10.0.143.75	10.0.143.75
39	10.0.143.76/31	10.0.143.76 – 10.0.143.77	10.0.143.77
40	10.0.143.78/31	10.0.143.78 – 10.0.143.79	10.0.143.79
41	10.0.143.80/31	10.0.143.80 – 10.0.143.81	10.0.143.81
42	10.0.143.82/31	10.0.143.82 – 10.0.143.83	10.0.143.83
43	10.0.143.84/31	10.0.143.84 – 10.0.143.85	10.0.143.85
44	10.0.143.86/31	10.0.143.86 – 10.0.143.87	10.0.143.87
45	10.0.143.88/31	10.0.143.88 – 10.0.143.89	10.0.143.89
46	10.0.143.90/31	10.0.143.90 – 10.0.143.91	10.0.143.91
47	10.0.143.92/31	10.0.143.92 – 10.0.143.93	10.0.143.93
48	10.0.143.94/31	10.0.143.94 – 10.0.143.95	10.0.143.95
49	10.0.143.96/31	10.0.143.96 – 10.0.143.97	10.0.143.97
50	10.0.143.98/31	10.0.143.98 – 10.0.143.99	10.0.143.99
51	10.0.143.100/31	10.0.143.100 – 10.0.143.101	10.0.143.101
52	10.0.143.102/31	10.0.143.102 – 10.0.143.103	10.0.143.103
53	10.0.143.104/31	10.0.143.104 – 10.0.143.105	10.0.143.105
54	10.0.143.106/31	10.0.143.106 – 10.0.143.107	10.0.143.107
55	10.0.143.108/31	10.0.143.108 – 10.0.143.109	10.0.143.109
56	10.0.143.110/31	10.0.143.110 – 10.0.143.111	10.0.143.111
57	10.0.143.112/31	10.0.143.112 – 10.0.143.113	10.0.143.113
58	10.0.143.114/31	10.0.143.114 – 10.0.143.115	10.0.143.115
59	10.0.143.116/31	10.0.143.116 – 10.0.143.117	10.0.143.117
60	10.0.143.118/31	10.0.143.118 – 10.0.143.119	10.0.143.119
61	10.0.143.120/31	10.0.143.120 – 10.0.143.121	10.0.143.121
62	10.0.143.122/31	10.0.143.122 – 10.0.143.123	10.0.143.123
63	10.0.143.124/31	10.0.143.124 – 10.0.143.125	10.0.143.125
64	10.0.143.126/31	10.0.143.126 – 10.0.143.127	10.0.143.127
65	10.0.143.128/31	10.0.143.128 – 10.0.143.129	10.0.143.129
66	10.0.143.130/31	10.0.143.130 – 10.0.143.131	10.0.143.131
67	10.0.143.132/31	10.0.143.132 – 10.0.143.133	10.0.143.133
68	10.0.143.134/31	10.0.143.134 – 10.0.143.135	10.0.143.135
69	10.0.143.136/31	10.0.143.136 – 10.0.143.137	10.0.143.137
70	10.0.143.138/31	10.0.143.138 – 10.0.143.139	10.0.143.139
71	10.0.143.140/31	10.0.143.140 – 10.0.143.141	10.0.143.141
72	10.0.143.142/31	10.0.143.142 – 10.0.143.143	10.0.143.143
73	10.0.143.144/31	10.0.143.144 – 10.0.143.145	10.0.143.145
74	10.0.143.146/31	10.0.143.146 – 10.0.143.147	10.0.143.147
75	10.0.143.148/31	10.0.143.148 – 10.0.143.149	10.0.143.149
76	10.0.143.150/31	10.0.143.150 – 10.0.143.151	10.0.143.151
77	10.0.143.152/31	10.0.143.152 – 10.0.143.153	10.0.143.153
78	10.0.143.154/31	10.0.143.154 – 10.0.143.155	10.0.143.155
79	10.0.143.156/31	10.0.143.156 – 10.0.143.157	10.0.143.157
80	10.0.143.158/31	10.0.143.158 – 10.0.143.159	10.0.143.159
81	10.0.143.160/31	10.0.143.160 – 10.0.143.161	10.0.143.161
82	10.0.143.162/31	10.0.143.162 – 10.0.143.163	10.0.143.163
83	10.0.143.164/31	10.0.143.164 – 10.0.143.165	10.0.143.165
84	10.0.143.166/31	10.0.143.166 – 10.0.143.167	10.0.143.167
85	10.0.143.168/31	10.0.143.168 – 10.0.143.169	10.0.143.169
86	10.0.143.170/31	10.0.143.170 – 10.0.143.171	10.0.143.171
87	10.0.143.172/31	10.0.143.172 – 10.0.143.173	10.0.143.173
88	10.0.143.174/31	10.0.143.174 – 10.0.143.175	10.0.143.175
89	10.0.143.176/31	10.0.143.176 – 10.0.143.177	10.0.143.177
90	10.0.143.178/31	10.0.143.178 – 10.0.143.179	10.0.143.179
91	10.0.143.180/31	10.0.143.180 – 10.0.143.181	10.0.143.181
92	10.0.143.182/31	10.0.143.182 – 10.0.143.183	10.0.143.183
93	10.0.143.184/31	10.0.143.184 – 10.0.143.185	10.0.143.185
94	10.0.143.186/31	10.0.143.186 – 10.0.143.187	10.0.143.187
95	10.0.143.188/31	10.0.143.188 – 10.0.143.189	10.0.143.189
96	10.0.143.190/31	10.0.143.190 – 10.0.143.191	10.0.143.191
97	10.0.143.192/31	10.0.143.192 – 10.0.143.193	10.0.143.193
98	10.0.143.194/31	10.0.143.194 – 10.0.143.195	10.0.143.195
99	10.0.143.196/31	10.0.143.196 – 10.0.143.197	10.0.143.197
100	10.0.143.198/31	10.0.143.198 – 10.0.143.199	10.0.143.199
101	10.0.143.200/31	10.0.143.200 – 10.0.143.201	10.0.143.201
102	10.0.143.202/31	10.0.143.202 – 10.0.143.203	10.0.143.203
103	10.0.143.204/31	10.0.143.204 – 10.0.143.205	10.0.143.205
104	10.0.143.206/31	10.0.143.206 – 10.0.143.207	10.0.143.207
105	10.0.143.208/31	10.0.143.208 – 10.0.143.209	10.0.143.209
106	10.0.143.210/31	10.0.143.210 – 10.0.143.211	10.0.143.211
107	10.0.143.212/31	10.0.143.212 – 10.0.143.213	10.0.143.213
108	10.0.143.214/31	10.0.143.214 – 10.0.143.215	10.0.143.215
109	10.0.143.216/31	10.0.143.216 – 10.0.143.217	10.0.143.217
110	10.0.143.218/31	10.0.143.218 – 10.0.143.219	10.0.143.219
111	10.0.143.220/31	10.0.143.220 – 10.0.143.221	10.0.143.221
112	10.0.143.222/31	10.0.143.222 – 10.0.143.223	10.0.143.223
113	10.0.143.224/31	10.0.143.224 – 10.0.143.225	10.0.143.225
114	10.0.143.226/31	10.0.143.226 – 10.0.143.227	10.0.143.227
115	10.0.143.228/31	10.0.143.228 – 10.0.143.229	10.0.143.229
116	10.0.143.230/31	10.0.143.230 – 10.0.143.231	10.0.143.231
117	10.0.143.232/31	10.0.143.232 – 10.0.143.233	10.0.143.233
118	10.0.143.234/31	10.0.143.234 – 10.0.143.235	10.0.143.235
119	10.0.143.236/31	10.0.143.236 – 10.0.143.237	10.0.143.237
120	10.0.143.238/31	10.0.143.238 – 10.0.143.239	10.0.143.239
121	10.0.143.240/31	10.0.143.240 – 10.0.143.241	10.0.143.241
122	10.0.143.242/31	10.0.143.242 – 10.0.143.243	10.0.143.243
123	10.0.143.244/31	10.0.143.244 – 10.0.143.245	10.0.143.245
124	10.0.143.246/31	10.0.143.246 – 10.0.143.247	10.0.143.247
125	10.0.143.248/31	10.0.143.248 – 10.0.143.249	10.0.143.249
126	10.0.143.250/31	10.0.143.250 – 10.0.143.251	10.0.143.251
127	10.0.143.252/31	10.0.143.252 – 10.0.143.253	10.0.143.253
128	10.0.143.254/31	10.0.143.254 – 10.0.143.255	10.0.143.255

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 →