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)10.76.255.0/24

network10.76.255.0/24

broadcast10.76.255.255

first host10.76.255.1

last host10.76.255.254

subnet mask255.255.255.0

wildcard0.0.0.255

addresses256

usable hosts254

classA

ipcalc 10.76.255.0/24

address00001010.01001100.11111111.00000000

subnet mask11111111.11111111.11111111.00000000

network00001010.01001100.11111111.00000000

broadcast00001010.01001100.11111111.11111111

green = network part, grey = host part

hex0x0a4cff00

decimal172818176

reverse dns0.255.76.10.in-addr.arpa

ipv4-mapped::ffff:a4c:ff00

/24 split into /31 · 128 subnets

close ×

#	network	host range	broadcast
1	10.76.255.0/31	10.76.255.0 – 10.76.255.1	10.76.255.1
2	10.76.255.2/31	10.76.255.2 – 10.76.255.3	10.76.255.3
3	10.76.255.4/31	10.76.255.4 – 10.76.255.5	10.76.255.5
4	10.76.255.6/31	10.76.255.6 – 10.76.255.7	10.76.255.7
5	10.76.255.8/31	10.76.255.8 – 10.76.255.9	10.76.255.9
6	10.76.255.10/31	10.76.255.10 – 10.76.255.11	10.76.255.11
7	10.76.255.12/31	10.76.255.12 – 10.76.255.13	10.76.255.13
8	10.76.255.14/31	10.76.255.14 – 10.76.255.15	10.76.255.15
9	10.76.255.16/31	10.76.255.16 – 10.76.255.17	10.76.255.17
10	10.76.255.18/31	10.76.255.18 – 10.76.255.19	10.76.255.19
11	10.76.255.20/31	10.76.255.20 – 10.76.255.21	10.76.255.21
12	10.76.255.22/31	10.76.255.22 – 10.76.255.23	10.76.255.23
13	10.76.255.24/31	10.76.255.24 – 10.76.255.25	10.76.255.25
14	10.76.255.26/31	10.76.255.26 – 10.76.255.27	10.76.255.27
15	10.76.255.28/31	10.76.255.28 – 10.76.255.29	10.76.255.29
16	10.76.255.30/31	10.76.255.30 – 10.76.255.31	10.76.255.31
17	10.76.255.32/31	10.76.255.32 – 10.76.255.33	10.76.255.33
18	10.76.255.34/31	10.76.255.34 – 10.76.255.35	10.76.255.35
19	10.76.255.36/31	10.76.255.36 – 10.76.255.37	10.76.255.37
20	10.76.255.38/31	10.76.255.38 – 10.76.255.39	10.76.255.39
21	10.76.255.40/31	10.76.255.40 – 10.76.255.41	10.76.255.41
22	10.76.255.42/31	10.76.255.42 – 10.76.255.43	10.76.255.43
23	10.76.255.44/31	10.76.255.44 – 10.76.255.45	10.76.255.45
24	10.76.255.46/31	10.76.255.46 – 10.76.255.47	10.76.255.47
25	10.76.255.48/31	10.76.255.48 – 10.76.255.49	10.76.255.49
26	10.76.255.50/31	10.76.255.50 – 10.76.255.51	10.76.255.51
27	10.76.255.52/31	10.76.255.52 – 10.76.255.53	10.76.255.53
28	10.76.255.54/31	10.76.255.54 – 10.76.255.55	10.76.255.55
29	10.76.255.56/31	10.76.255.56 – 10.76.255.57	10.76.255.57
30	10.76.255.58/31	10.76.255.58 – 10.76.255.59	10.76.255.59
31	10.76.255.60/31	10.76.255.60 – 10.76.255.61	10.76.255.61
32	10.76.255.62/31	10.76.255.62 – 10.76.255.63	10.76.255.63
33	10.76.255.64/31	10.76.255.64 – 10.76.255.65	10.76.255.65
34	10.76.255.66/31	10.76.255.66 – 10.76.255.67	10.76.255.67
35	10.76.255.68/31	10.76.255.68 – 10.76.255.69	10.76.255.69
36	10.76.255.70/31	10.76.255.70 – 10.76.255.71	10.76.255.71
37	10.76.255.72/31	10.76.255.72 – 10.76.255.73	10.76.255.73
38	10.76.255.74/31	10.76.255.74 – 10.76.255.75	10.76.255.75
39	10.76.255.76/31	10.76.255.76 – 10.76.255.77	10.76.255.77
40	10.76.255.78/31	10.76.255.78 – 10.76.255.79	10.76.255.79
41	10.76.255.80/31	10.76.255.80 – 10.76.255.81	10.76.255.81
42	10.76.255.82/31	10.76.255.82 – 10.76.255.83	10.76.255.83
43	10.76.255.84/31	10.76.255.84 – 10.76.255.85	10.76.255.85
44	10.76.255.86/31	10.76.255.86 – 10.76.255.87	10.76.255.87
45	10.76.255.88/31	10.76.255.88 – 10.76.255.89	10.76.255.89
46	10.76.255.90/31	10.76.255.90 – 10.76.255.91	10.76.255.91
47	10.76.255.92/31	10.76.255.92 – 10.76.255.93	10.76.255.93
48	10.76.255.94/31	10.76.255.94 – 10.76.255.95	10.76.255.95
49	10.76.255.96/31	10.76.255.96 – 10.76.255.97	10.76.255.97
50	10.76.255.98/31	10.76.255.98 – 10.76.255.99	10.76.255.99
51	10.76.255.100/31	10.76.255.100 – 10.76.255.101	10.76.255.101
52	10.76.255.102/31	10.76.255.102 – 10.76.255.103	10.76.255.103
53	10.76.255.104/31	10.76.255.104 – 10.76.255.105	10.76.255.105
54	10.76.255.106/31	10.76.255.106 – 10.76.255.107	10.76.255.107
55	10.76.255.108/31	10.76.255.108 – 10.76.255.109	10.76.255.109
56	10.76.255.110/31	10.76.255.110 – 10.76.255.111	10.76.255.111
57	10.76.255.112/31	10.76.255.112 – 10.76.255.113	10.76.255.113
58	10.76.255.114/31	10.76.255.114 – 10.76.255.115	10.76.255.115
59	10.76.255.116/31	10.76.255.116 – 10.76.255.117	10.76.255.117
60	10.76.255.118/31	10.76.255.118 – 10.76.255.119	10.76.255.119
61	10.76.255.120/31	10.76.255.120 – 10.76.255.121	10.76.255.121
62	10.76.255.122/31	10.76.255.122 – 10.76.255.123	10.76.255.123
63	10.76.255.124/31	10.76.255.124 – 10.76.255.125	10.76.255.125
64	10.76.255.126/31	10.76.255.126 – 10.76.255.127	10.76.255.127
65	10.76.255.128/31	10.76.255.128 – 10.76.255.129	10.76.255.129
66	10.76.255.130/31	10.76.255.130 – 10.76.255.131	10.76.255.131
67	10.76.255.132/31	10.76.255.132 – 10.76.255.133	10.76.255.133
68	10.76.255.134/31	10.76.255.134 – 10.76.255.135	10.76.255.135
69	10.76.255.136/31	10.76.255.136 – 10.76.255.137	10.76.255.137
70	10.76.255.138/31	10.76.255.138 – 10.76.255.139	10.76.255.139
71	10.76.255.140/31	10.76.255.140 – 10.76.255.141	10.76.255.141
72	10.76.255.142/31	10.76.255.142 – 10.76.255.143	10.76.255.143
73	10.76.255.144/31	10.76.255.144 – 10.76.255.145	10.76.255.145
74	10.76.255.146/31	10.76.255.146 – 10.76.255.147	10.76.255.147
75	10.76.255.148/31	10.76.255.148 – 10.76.255.149	10.76.255.149
76	10.76.255.150/31	10.76.255.150 – 10.76.255.151	10.76.255.151
77	10.76.255.152/31	10.76.255.152 – 10.76.255.153	10.76.255.153
78	10.76.255.154/31	10.76.255.154 – 10.76.255.155	10.76.255.155
79	10.76.255.156/31	10.76.255.156 – 10.76.255.157	10.76.255.157
80	10.76.255.158/31	10.76.255.158 – 10.76.255.159	10.76.255.159
81	10.76.255.160/31	10.76.255.160 – 10.76.255.161	10.76.255.161
82	10.76.255.162/31	10.76.255.162 – 10.76.255.163	10.76.255.163
83	10.76.255.164/31	10.76.255.164 – 10.76.255.165	10.76.255.165
84	10.76.255.166/31	10.76.255.166 – 10.76.255.167	10.76.255.167
85	10.76.255.168/31	10.76.255.168 – 10.76.255.169	10.76.255.169
86	10.76.255.170/31	10.76.255.170 – 10.76.255.171	10.76.255.171
87	10.76.255.172/31	10.76.255.172 – 10.76.255.173	10.76.255.173
88	10.76.255.174/31	10.76.255.174 – 10.76.255.175	10.76.255.175
89	10.76.255.176/31	10.76.255.176 – 10.76.255.177	10.76.255.177
90	10.76.255.178/31	10.76.255.178 – 10.76.255.179	10.76.255.179
91	10.76.255.180/31	10.76.255.180 – 10.76.255.181	10.76.255.181
92	10.76.255.182/31	10.76.255.182 – 10.76.255.183	10.76.255.183
93	10.76.255.184/31	10.76.255.184 – 10.76.255.185	10.76.255.185
94	10.76.255.186/31	10.76.255.186 – 10.76.255.187	10.76.255.187
95	10.76.255.188/31	10.76.255.188 – 10.76.255.189	10.76.255.189
96	10.76.255.190/31	10.76.255.190 – 10.76.255.191	10.76.255.191
97	10.76.255.192/31	10.76.255.192 – 10.76.255.193	10.76.255.193
98	10.76.255.194/31	10.76.255.194 – 10.76.255.195	10.76.255.195
99	10.76.255.196/31	10.76.255.196 – 10.76.255.197	10.76.255.197
100	10.76.255.198/31	10.76.255.198 – 10.76.255.199	10.76.255.199
101	10.76.255.200/31	10.76.255.200 – 10.76.255.201	10.76.255.201
102	10.76.255.202/31	10.76.255.202 – 10.76.255.203	10.76.255.203
103	10.76.255.204/31	10.76.255.204 – 10.76.255.205	10.76.255.205
104	10.76.255.206/31	10.76.255.206 – 10.76.255.207	10.76.255.207
105	10.76.255.208/31	10.76.255.208 – 10.76.255.209	10.76.255.209
106	10.76.255.210/31	10.76.255.210 – 10.76.255.211	10.76.255.211
107	10.76.255.212/31	10.76.255.212 – 10.76.255.213	10.76.255.213
108	10.76.255.214/31	10.76.255.214 – 10.76.255.215	10.76.255.215
109	10.76.255.216/31	10.76.255.216 – 10.76.255.217	10.76.255.217
110	10.76.255.218/31	10.76.255.218 – 10.76.255.219	10.76.255.219
111	10.76.255.220/31	10.76.255.220 – 10.76.255.221	10.76.255.221
112	10.76.255.222/31	10.76.255.222 – 10.76.255.223	10.76.255.223
113	10.76.255.224/31	10.76.255.224 – 10.76.255.225	10.76.255.225
114	10.76.255.226/31	10.76.255.226 – 10.76.255.227	10.76.255.227
115	10.76.255.228/31	10.76.255.228 – 10.76.255.229	10.76.255.229
116	10.76.255.230/31	10.76.255.230 – 10.76.255.231	10.76.255.231
117	10.76.255.232/31	10.76.255.232 – 10.76.255.233	10.76.255.233
118	10.76.255.234/31	10.76.255.234 – 10.76.255.235	10.76.255.235
119	10.76.255.236/31	10.76.255.236 – 10.76.255.237	10.76.255.237
120	10.76.255.238/31	10.76.255.238 – 10.76.255.239	10.76.255.239
121	10.76.255.240/31	10.76.255.240 – 10.76.255.241	10.76.255.241
122	10.76.255.242/31	10.76.255.242 – 10.76.255.243	10.76.255.243
123	10.76.255.244/31	10.76.255.244 – 10.76.255.245	10.76.255.245
124	10.76.255.246/31	10.76.255.246 – 10.76.255.247	10.76.255.247
125	10.76.255.248/31	10.76.255.248 – 10.76.255.249	10.76.255.249
126	10.76.255.250/31	10.76.255.250 – 10.76.255.251	10.76.255.251
127	10.76.255.252/31	10.76.255.252 – 10.76.255.253	10.76.255.253
128	10.76.255.254/31	10.76.255.254 – 10.76.255.255	10.76.255.255

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 →