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)10.63.9.0/24

network10.63.9.0/24

broadcast10.63.9.255

first host10.63.9.1

last host10.63.9.254

subnet mask255.255.255.0

wildcard0.0.0.255

addresses256

usable hosts254

classA

ipcalc 10.63.9.0/24

address00001010.00111111.00001001.00000000

subnet mask11111111.11111111.11111111.00000000

network00001010.00111111.00001001.00000000

broadcast00001010.00111111.00001001.11111111

green = network part, grey = host part

hex0x0a3f0900

decimal171903232

reverse dns0.9.63.10.in-addr.arpa

ipv4-mapped::ffff:a3f:900

/24 split into /31 · 128 subnets

close ×

#	network	host range	broadcast
1	10.63.9.0/31	10.63.9.0 – 10.63.9.1	10.63.9.1
2	10.63.9.2/31	10.63.9.2 – 10.63.9.3	10.63.9.3
3	10.63.9.4/31	10.63.9.4 – 10.63.9.5	10.63.9.5
4	10.63.9.6/31	10.63.9.6 – 10.63.9.7	10.63.9.7
5	10.63.9.8/31	10.63.9.8 – 10.63.9.9	10.63.9.9
6	10.63.9.10/31	10.63.9.10 – 10.63.9.11	10.63.9.11
7	10.63.9.12/31	10.63.9.12 – 10.63.9.13	10.63.9.13
8	10.63.9.14/31	10.63.9.14 – 10.63.9.15	10.63.9.15
9	10.63.9.16/31	10.63.9.16 – 10.63.9.17	10.63.9.17
10	10.63.9.18/31	10.63.9.18 – 10.63.9.19	10.63.9.19
11	10.63.9.20/31	10.63.9.20 – 10.63.9.21	10.63.9.21
12	10.63.9.22/31	10.63.9.22 – 10.63.9.23	10.63.9.23
13	10.63.9.24/31	10.63.9.24 – 10.63.9.25	10.63.9.25
14	10.63.9.26/31	10.63.9.26 – 10.63.9.27	10.63.9.27
15	10.63.9.28/31	10.63.9.28 – 10.63.9.29	10.63.9.29
16	10.63.9.30/31	10.63.9.30 – 10.63.9.31	10.63.9.31
17	10.63.9.32/31	10.63.9.32 – 10.63.9.33	10.63.9.33
18	10.63.9.34/31	10.63.9.34 – 10.63.9.35	10.63.9.35
19	10.63.9.36/31	10.63.9.36 – 10.63.9.37	10.63.9.37
20	10.63.9.38/31	10.63.9.38 – 10.63.9.39	10.63.9.39
21	10.63.9.40/31	10.63.9.40 – 10.63.9.41	10.63.9.41
22	10.63.9.42/31	10.63.9.42 – 10.63.9.43	10.63.9.43
23	10.63.9.44/31	10.63.9.44 – 10.63.9.45	10.63.9.45
24	10.63.9.46/31	10.63.9.46 – 10.63.9.47	10.63.9.47
25	10.63.9.48/31	10.63.9.48 – 10.63.9.49	10.63.9.49
26	10.63.9.50/31	10.63.9.50 – 10.63.9.51	10.63.9.51
27	10.63.9.52/31	10.63.9.52 – 10.63.9.53	10.63.9.53
28	10.63.9.54/31	10.63.9.54 – 10.63.9.55	10.63.9.55
29	10.63.9.56/31	10.63.9.56 – 10.63.9.57	10.63.9.57
30	10.63.9.58/31	10.63.9.58 – 10.63.9.59	10.63.9.59
31	10.63.9.60/31	10.63.9.60 – 10.63.9.61	10.63.9.61
32	10.63.9.62/31	10.63.9.62 – 10.63.9.63	10.63.9.63
33	10.63.9.64/31	10.63.9.64 – 10.63.9.65	10.63.9.65
34	10.63.9.66/31	10.63.9.66 – 10.63.9.67	10.63.9.67
35	10.63.9.68/31	10.63.9.68 – 10.63.9.69	10.63.9.69
36	10.63.9.70/31	10.63.9.70 – 10.63.9.71	10.63.9.71
37	10.63.9.72/31	10.63.9.72 – 10.63.9.73	10.63.9.73
38	10.63.9.74/31	10.63.9.74 – 10.63.9.75	10.63.9.75
39	10.63.9.76/31	10.63.9.76 – 10.63.9.77	10.63.9.77
40	10.63.9.78/31	10.63.9.78 – 10.63.9.79	10.63.9.79
41	10.63.9.80/31	10.63.9.80 – 10.63.9.81	10.63.9.81
42	10.63.9.82/31	10.63.9.82 – 10.63.9.83	10.63.9.83
43	10.63.9.84/31	10.63.9.84 – 10.63.9.85	10.63.9.85
44	10.63.9.86/31	10.63.9.86 – 10.63.9.87	10.63.9.87
45	10.63.9.88/31	10.63.9.88 – 10.63.9.89	10.63.9.89
46	10.63.9.90/31	10.63.9.90 – 10.63.9.91	10.63.9.91
47	10.63.9.92/31	10.63.9.92 – 10.63.9.93	10.63.9.93
48	10.63.9.94/31	10.63.9.94 – 10.63.9.95	10.63.9.95
49	10.63.9.96/31	10.63.9.96 – 10.63.9.97	10.63.9.97
50	10.63.9.98/31	10.63.9.98 – 10.63.9.99	10.63.9.99
51	10.63.9.100/31	10.63.9.100 – 10.63.9.101	10.63.9.101
52	10.63.9.102/31	10.63.9.102 – 10.63.9.103	10.63.9.103
53	10.63.9.104/31	10.63.9.104 – 10.63.9.105	10.63.9.105
54	10.63.9.106/31	10.63.9.106 – 10.63.9.107	10.63.9.107
55	10.63.9.108/31	10.63.9.108 – 10.63.9.109	10.63.9.109
56	10.63.9.110/31	10.63.9.110 – 10.63.9.111	10.63.9.111
57	10.63.9.112/31	10.63.9.112 – 10.63.9.113	10.63.9.113
58	10.63.9.114/31	10.63.9.114 – 10.63.9.115	10.63.9.115
59	10.63.9.116/31	10.63.9.116 – 10.63.9.117	10.63.9.117
60	10.63.9.118/31	10.63.9.118 – 10.63.9.119	10.63.9.119
61	10.63.9.120/31	10.63.9.120 – 10.63.9.121	10.63.9.121
62	10.63.9.122/31	10.63.9.122 – 10.63.9.123	10.63.9.123
63	10.63.9.124/31	10.63.9.124 – 10.63.9.125	10.63.9.125
64	10.63.9.126/31	10.63.9.126 – 10.63.9.127	10.63.9.127
65	10.63.9.128/31	10.63.9.128 – 10.63.9.129	10.63.9.129
66	10.63.9.130/31	10.63.9.130 – 10.63.9.131	10.63.9.131
67	10.63.9.132/31	10.63.9.132 – 10.63.9.133	10.63.9.133
68	10.63.9.134/31	10.63.9.134 – 10.63.9.135	10.63.9.135
69	10.63.9.136/31	10.63.9.136 – 10.63.9.137	10.63.9.137
70	10.63.9.138/31	10.63.9.138 – 10.63.9.139	10.63.9.139
71	10.63.9.140/31	10.63.9.140 – 10.63.9.141	10.63.9.141
72	10.63.9.142/31	10.63.9.142 – 10.63.9.143	10.63.9.143
73	10.63.9.144/31	10.63.9.144 – 10.63.9.145	10.63.9.145
74	10.63.9.146/31	10.63.9.146 – 10.63.9.147	10.63.9.147
75	10.63.9.148/31	10.63.9.148 – 10.63.9.149	10.63.9.149
76	10.63.9.150/31	10.63.9.150 – 10.63.9.151	10.63.9.151
77	10.63.9.152/31	10.63.9.152 – 10.63.9.153	10.63.9.153
78	10.63.9.154/31	10.63.9.154 – 10.63.9.155	10.63.9.155
79	10.63.9.156/31	10.63.9.156 – 10.63.9.157	10.63.9.157
80	10.63.9.158/31	10.63.9.158 – 10.63.9.159	10.63.9.159
81	10.63.9.160/31	10.63.9.160 – 10.63.9.161	10.63.9.161
82	10.63.9.162/31	10.63.9.162 – 10.63.9.163	10.63.9.163
83	10.63.9.164/31	10.63.9.164 – 10.63.9.165	10.63.9.165
84	10.63.9.166/31	10.63.9.166 – 10.63.9.167	10.63.9.167
85	10.63.9.168/31	10.63.9.168 – 10.63.9.169	10.63.9.169
86	10.63.9.170/31	10.63.9.170 – 10.63.9.171	10.63.9.171
87	10.63.9.172/31	10.63.9.172 – 10.63.9.173	10.63.9.173
88	10.63.9.174/31	10.63.9.174 – 10.63.9.175	10.63.9.175
89	10.63.9.176/31	10.63.9.176 – 10.63.9.177	10.63.9.177
90	10.63.9.178/31	10.63.9.178 – 10.63.9.179	10.63.9.179
91	10.63.9.180/31	10.63.9.180 – 10.63.9.181	10.63.9.181
92	10.63.9.182/31	10.63.9.182 – 10.63.9.183	10.63.9.183
93	10.63.9.184/31	10.63.9.184 – 10.63.9.185	10.63.9.185
94	10.63.9.186/31	10.63.9.186 – 10.63.9.187	10.63.9.187
95	10.63.9.188/31	10.63.9.188 – 10.63.9.189	10.63.9.189
96	10.63.9.190/31	10.63.9.190 – 10.63.9.191	10.63.9.191
97	10.63.9.192/31	10.63.9.192 – 10.63.9.193	10.63.9.193
98	10.63.9.194/31	10.63.9.194 – 10.63.9.195	10.63.9.195
99	10.63.9.196/31	10.63.9.196 – 10.63.9.197	10.63.9.197
100	10.63.9.198/31	10.63.9.198 – 10.63.9.199	10.63.9.199
101	10.63.9.200/31	10.63.9.200 – 10.63.9.201	10.63.9.201
102	10.63.9.202/31	10.63.9.202 – 10.63.9.203	10.63.9.203
103	10.63.9.204/31	10.63.9.204 – 10.63.9.205	10.63.9.205
104	10.63.9.206/31	10.63.9.206 – 10.63.9.207	10.63.9.207
105	10.63.9.208/31	10.63.9.208 – 10.63.9.209	10.63.9.209
106	10.63.9.210/31	10.63.9.210 – 10.63.9.211	10.63.9.211
107	10.63.9.212/31	10.63.9.212 – 10.63.9.213	10.63.9.213
108	10.63.9.214/31	10.63.9.214 – 10.63.9.215	10.63.9.215
109	10.63.9.216/31	10.63.9.216 – 10.63.9.217	10.63.9.217
110	10.63.9.218/31	10.63.9.218 – 10.63.9.219	10.63.9.219
111	10.63.9.220/31	10.63.9.220 – 10.63.9.221	10.63.9.221
112	10.63.9.222/31	10.63.9.222 – 10.63.9.223	10.63.9.223
113	10.63.9.224/31	10.63.9.224 – 10.63.9.225	10.63.9.225
114	10.63.9.226/31	10.63.9.226 – 10.63.9.227	10.63.9.227
115	10.63.9.228/31	10.63.9.228 – 10.63.9.229	10.63.9.229
116	10.63.9.230/31	10.63.9.230 – 10.63.9.231	10.63.9.231
117	10.63.9.232/31	10.63.9.232 – 10.63.9.233	10.63.9.233
118	10.63.9.234/31	10.63.9.234 – 10.63.9.235	10.63.9.235
119	10.63.9.236/31	10.63.9.236 – 10.63.9.237	10.63.9.237
120	10.63.9.238/31	10.63.9.238 – 10.63.9.239	10.63.9.239
121	10.63.9.240/31	10.63.9.240 – 10.63.9.241	10.63.9.241
122	10.63.9.242/31	10.63.9.242 – 10.63.9.243	10.63.9.243
123	10.63.9.244/31	10.63.9.244 – 10.63.9.245	10.63.9.245
124	10.63.9.246/31	10.63.9.246 – 10.63.9.247	10.63.9.247
125	10.63.9.248/31	10.63.9.248 – 10.63.9.249	10.63.9.249
126	10.63.9.250/31	10.63.9.250 – 10.63.9.251	10.63.9.251
127	10.63.9.252/31	10.63.9.252 – 10.63.9.253	10.63.9.253
128	10.63.9.254/31	10.63.9.254 – 10.63.9.255	10.63.9.255

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 →