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)10.0.101.0/24

network10.0.101.0/24

broadcast10.0.101.255

first host10.0.101.1

last host10.0.101.254

subnet mask255.255.255.0

wildcard0.0.0.255

addresses256

usable hosts254

classA

ipcalc 10.0.101.0/24

address00001010.00000000.01100101.00000000

subnet mask11111111.11111111.11111111.00000000

network00001010.00000000.01100101.00000000

broadcast00001010.00000000.01100101.11111111

green = network part, grey = host part

hex0x0a006500

decimal167798016

reverse dns0.101.0.10.in-addr.arpa

ipv4-mapped::ffff:a00:6500

/24 split into /31 · 128 subnets

close ×

#	network	host range	broadcast
1	10.0.101.0/31	10.0.101.0 – 10.0.101.1	10.0.101.1
2	10.0.101.2/31	10.0.101.2 – 10.0.101.3	10.0.101.3
3	10.0.101.4/31	10.0.101.4 – 10.0.101.5	10.0.101.5
4	10.0.101.6/31	10.0.101.6 – 10.0.101.7	10.0.101.7
5	10.0.101.8/31	10.0.101.8 – 10.0.101.9	10.0.101.9
6	10.0.101.10/31	10.0.101.10 – 10.0.101.11	10.0.101.11
7	10.0.101.12/31	10.0.101.12 – 10.0.101.13	10.0.101.13
8	10.0.101.14/31	10.0.101.14 – 10.0.101.15	10.0.101.15
9	10.0.101.16/31	10.0.101.16 – 10.0.101.17	10.0.101.17
10	10.0.101.18/31	10.0.101.18 – 10.0.101.19	10.0.101.19
11	10.0.101.20/31	10.0.101.20 – 10.0.101.21	10.0.101.21
12	10.0.101.22/31	10.0.101.22 – 10.0.101.23	10.0.101.23
13	10.0.101.24/31	10.0.101.24 – 10.0.101.25	10.0.101.25
14	10.0.101.26/31	10.0.101.26 – 10.0.101.27	10.0.101.27
15	10.0.101.28/31	10.0.101.28 – 10.0.101.29	10.0.101.29
16	10.0.101.30/31	10.0.101.30 – 10.0.101.31	10.0.101.31
17	10.0.101.32/31	10.0.101.32 – 10.0.101.33	10.0.101.33
18	10.0.101.34/31	10.0.101.34 – 10.0.101.35	10.0.101.35
19	10.0.101.36/31	10.0.101.36 – 10.0.101.37	10.0.101.37
20	10.0.101.38/31	10.0.101.38 – 10.0.101.39	10.0.101.39
21	10.0.101.40/31	10.0.101.40 – 10.0.101.41	10.0.101.41
22	10.0.101.42/31	10.0.101.42 – 10.0.101.43	10.0.101.43
23	10.0.101.44/31	10.0.101.44 – 10.0.101.45	10.0.101.45
24	10.0.101.46/31	10.0.101.46 – 10.0.101.47	10.0.101.47
25	10.0.101.48/31	10.0.101.48 – 10.0.101.49	10.0.101.49
26	10.0.101.50/31	10.0.101.50 – 10.0.101.51	10.0.101.51
27	10.0.101.52/31	10.0.101.52 – 10.0.101.53	10.0.101.53
28	10.0.101.54/31	10.0.101.54 – 10.0.101.55	10.0.101.55
29	10.0.101.56/31	10.0.101.56 – 10.0.101.57	10.0.101.57
30	10.0.101.58/31	10.0.101.58 – 10.0.101.59	10.0.101.59
31	10.0.101.60/31	10.0.101.60 – 10.0.101.61	10.0.101.61
32	10.0.101.62/31	10.0.101.62 – 10.0.101.63	10.0.101.63
33	10.0.101.64/31	10.0.101.64 – 10.0.101.65	10.0.101.65
34	10.0.101.66/31	10.0.101.66 – 10.0.101.67	10.0.101.67
35	10.0.101.68/31	10.0.101.68 – 10.0.101.69	10.0.101.69
36	10.0.101.70/31	10.0.101.70 – 10.0.101.71	10.0.101.71
37	10.0.101.72/31	10.0.101.72 – 10.0.101.73	10.0.101.73
38	10.0.101.74/31	10.0.101.74 – 10.0.101.75	10.0.101.75
39	10.0.101.76/31	10.0.101.76 – 10.0.101.77	10.0.101.77
40	10.0.101.78/31	10.0.101.78 – 10.0.101.79	10.0.101.79
41	10.0.101.80/31	10.0.101.80 – 10.0.101.81	10.0.101.81
42	10.0.101.82/31	10.0.101.82 – 10.0.101.83	10.0.101.83
43	10.0.101.84/31	10.0.101.84 – 10.0.101.85	10.0.101.85
44	10.0.101.86/31	10.0.101.86 – 10.0.101.87	10.0.101.87
45	10.0.101.88/31	10.0.101.88 – 10.0.101.89	10.0.101.89
46	10.0.101.90/31	10.0.101.90 – 10.0.101.91	10.0.101.91
47	10.0.101.92/31	10.0.101.92 – 10.0.101.93	10.0.101.93
48	10.0.101.94/31	10.0.101.94 – 10.0.101.95	10.0.101.95
49	10.0.101.96/31	10.0.101.96 – 10.0.101.97	10.0.101.97
50	10.0.101.98/31	10.0.101.98 – 10.0.101.99	10.0.101.99
51	10.0.101.100/31	10.0.101.100 – 10.0.101.101	10.0.101.101
52	10.0.101.102/31	10.0.101.102 – 10.0.101.103	10.0.101.103
53	10.0.101.104/31	10.0.101.104 – 10.0.101.105	10.0.101.105
54	10.0.101.106/31	10.0.101.106 – 10.0.101.107	10.0.101.107
55	10.0.101.108/31	10.0.101.108 – 10.0.101.109	10.0.101.109
56	10.0.101.110/31	10.0.101.110 – 10.0.101.111	10.0.101.111
57	10.0.101.112/31	10.0.101.112 – 10.0.101.113	10.0.101.113
58	10.0.101.114/31	10.0.101.114 – 10.0.101.115	10.0.101.115
59	10.0.101.116/31	10.0.101.116 – 10.0.101.117	10.0.101.117
60	10.0.101.118/31	10.0.101.118 – 10.0.101.119	10.0.101.119
61	10.0.101.120/31	10.0.101.120 – 10.0.101.121	10.0.101.121
62	10.0.101.122/31	10.0.101.122 – 10.0.101.123	10.0.101.123
63	10.0.101.124/31	10.0.101.124 – 10.0.101.125	10.0.101.125
64	10.0.101.126/31	10.0.101.126 – 10.0.101.127	10.0.101.127
65	10.0.101.128/31	10.0.101.128 – 10.0.101.129	10.0.101.129
66	10.0.101.130/31	10.0.101.130 – 10.0.101.131	10.0.101.131
67	10.0.101.132/31	10.0.101.132 – 10.0.101.133	10.0.101.133
68	10.0.101.134/31	10.0.101.134 – 10.0.101.135	10.0.101.135
69	10.0.101.136/31	10.0.101.136 – 10.0.101.137	10.0.101.137
70	10.0.101.138/31	10.0.101.138 – 10.0.101.139	10.0.101.139
71	10.0.101.140/31	10.0.101.140 – 10.0.101.141	10.0.101.141
72	10.0.101.142/31	10.0.101.142 – 10.0.101.143	10.0.101.143
73	10.0.101.144/31	10.0.101.144 – 10.0.101.145	10.0.101.145
74	10.0.101.146/31	10.0.101.146 – 10.0.101.147	10.0.101.147
75	10.0.101.148/31	10.0.101.148 – 10.0.101.149	10.0.101.149
76	10.0.101.150/31	10.0.101.150 – 10.0.101.151	10.0.101.151
77	10.0.101.152/31	10.0.101.152 – 10.0.101.153	10.0.101.153
78	10.0.101.154/31	10.0.101.154 – 10.0.101.155	10.0.101.155
79	10.0.101.156/31	10.0.101.156 – 10.0.101.157	10.0.101.157
80	10.0.101.158/31	10.0.101.158 – 10.0.101.159	10.0.101.159
81	10.0.101.160/31	10.0.101.160 – 10.0.101.161	10.0.101.161
82	10.0.101.162/31	10.0.101.162 – 10.0.101.163	10.0.101.163
83	10.0.101.164/31	10.0.101.164 – 10.0.101.165	10.0.101.165
84	10.0.101.166/31	10.0.101.166 – 10.0.101.167	10.0.101.167
85	10.0.101.168/31	10.0.101.168 – 10.0.101.169	10.0.101.169
86	10.0.101.170/31	10.0.101.170 – 10.0.101.171	10.0.101.171
87	10.0.101.172/31	10.0.101.172 – 10.0.101.173	10.0.101.173
88	10.0.101.174/31	10.0.101.174 – 10.0.101.175	10.0.101.175
89	10.0.101.176/31	10.0.101.176 – 10.0.101.177	10.0.101.177
90	10.0.101.178/31	10.0.101.178 – 10.0.101.179	10.0.101.179
91	10.0.101.180/31	10.0.101.180 – 10.0.101.181	10.0.101.181
92	10.0.101.182/31	10.0.101.182 – 10.0.101.183	10.0.101.183
93	10.0.101.184/31	10.0.101.184 – 10.0.101.185	10.0.101.185
94	10.0.101.186/31	10.0.101.186 – 10.0.101.187	10.0.101.187
95	10.0.101.188/31	10.0.101.188 – 10.0.101.189	10.0.101.189
96	10.0.101.190/31	10.0.101.190 – 10.0.101.191	10.0.101.191
97	10.0.101.192/31	10.0.101.192 – 10.0.101.193	10.0.101.193
98	10.0.101.194/31	10.0.101.194 – 10.0.101.195	10.0.101.195
99	10.0.101.196/31	10.0.101.196 – 10.0.101.197	10.0.101.197
100	10.0.101.198/31	10.0.101.198 – 10.0.101.199	10.0.101.199
101	10.0.101.200/31	10.0.101.200 – 10.0.101.201	10.0.101.201
102	10.0.101.202/31	10.0.101.202 – 10.0.101.203	10.0.101.203
103	10.0.101.204/31	10.0.101.204 – 10.0.101.205	10.0.101.205
104	10.0.101.206/31	10.0.101.206 – 10.0.101.207	10.0.101.207
105	10.0.101.208/31	10.0.101.208 – 10.0.101.209	10.0.101.209
106	10.0.101.210/31	10.0.101.210 – 10.0.101.211	10.0.101.211
107	10.0.101.212/31	10.0.101.212 – 10.0.101.213	10.0.101.213
108	10.0.101.214/31	10.0.101.214 – 10.0.101.215	10.0.101.215
109	10.0.101.216/31	10.0.101.216 – 10.0.101.217	10.0.101.217
110	10.0.101.218/31	10.0.101.218 – 10.0.101.219	10.0.101.219
111	10.0.101.220/31	10.0.101.220 – 10.0.101.221	10.0.101.221
112	10.0.101.222/31	10.0.101.222 – 10.0.101.223	10.0.101.223
113	10.0.101.224/31	10.0.101.224 – 10.0.101.225	10.0.101.225
114	10.0.101.226/31	10.0.101.226 – 10.0.101.227	10.0.101.227
115	10.0.101.228/31	10.0.101.228 – 10.0.101.229	10.0.101.229
116	10.0.101.230/31	10.0.101.230 – 10.0.101.231	10.0.101.231
117	10.0.101.232/31	10.0.101.232 – 10.0.101.233	10.0.101.233
118	10.0.101.234/31	10.0.101.234 – 10.0.101.235	10.0.101.235
119	10.0.101.236/31	10.0.101.236 – 10.0.101.237	10.0.101.237
120	10.0.101.238/31	10.0.101.238 – 10.0.101.239	10.0.101.239
121	10.0.101.240/31	10.0.101.240 – 10.0.101.241	10.0.101.241
122	10.0.101.242/31	10.0.101.242 – 10.0.101.243	10.0.101.243
123	10.0.101.244/31	10.0.101.244 – 10.0.101.245	10.0.101.245
124	10.0.101.246/31	10.0.101.246 – 10.0.101.247	10.0.101.247
125	10.0.101.248/31	10.0.101.248 – 10.0.101.249	10.0.101.249
126	10.0.101.250/31	10.0.101.250 – 10.0.101.251	10.0.101.251
127	10.0.101.252/31	10.0.101.252 – 10.0.101.253	10.0.101.253
128	10.0.101.254/31	10.0.101.254 – 10.0.101.255	10.0.101.255

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 →