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)10.3.27.0/24

network10.3.27.0/24

broadcast10.3.27.255

first host10.3.27.1

last host10.3.27.254

subnet mask255.255.255.0

wildcard0.0.0.255

addresses256

usable hosts254

classA

ipcalc 10.3.27.0/24

address00001010.00000011.00011011.00000000

subnet mask11111111.11111111.11111111.00000000

network00001010.00000011.00011011.00000000

broadcast00001010.00000011.00011011.11111111

green = network part, grey = host part

hex0x0a031b00

decimal167975680

reverse dns0.27.3.10.in-addr.arpa

ipv4-mapped::ffff:a03:1b00

/24 split into /31 · 128 subnets

close ×

#	network	host range	broadcast
1	10.3.27.0/31	10.3.27.0 – 10.3.27.1	10.3.27.1
2	10.3.27.2/31	10.3.27.2 – 10.3.27.3	10.3.27.3
3	10.3.27.4/31	10.3.27.4 – 10.3.27.5	10.3.27.5
4	10.3.27.6/31	10.3.27.6 – 10.3.27.7	10.3.27.7
5	10.3.27.8/31	10.3.27.8 – 10.3.27.9	10.3.27.9
6	10.3.27.10/31	10.3.27.10 – 10.3.27.11	10.3.27.11
7	10.3.27.12/31	10.3.27.12 – 10.3.27.13	10.3.27.13
8	10.3.27.14/31	10.3.27.14 – 10.3.27.15	10.3.27.15
9	10.3.27.16/31	10.3.27.16 – 10.3.27.17	10.3.27.17
10	10.3.27.18/31	10.3.27.18 – 10.3.27.19	10.3.27.19
11	10.3.27.20/31	10.3.27.20 – 10.3.27.21	10.3.27.21
12	10.3.27.22/31	10.3.27.22 – 10.3.27.23	10.3.27.23
13	10.3.27.24/31	10.3.27.24 – 10.3.27.25	10.3.27.25
14	10.3.27.26/31	10.3.27.26 – 10.3.27.27	10.3.27.27
15	10.3.27.28/31	10.3.27.28 – 10.3.27.29	10.3.27.29
16	10.3.27.30/31	10.3.27.30 – 10.3.27.31	10.3.27.31
17	10.3.27.32/31	10.3.27.32 – 10.3.27.33	10.3.27.33
18	10.3.27.34/31	10.3.27.34 – 10.3.27.35	10.3.27.35
19	10.3.27.36/31	10.3.27.36 – 10.3.27.37	10.3.27.37
20	10.3.27.38/31	10.3.27.38 – 10.3.27.39	10.3.27.39
21	10.3.27.40/31	10.3.27.40 – 10.3.27.41	10.3.27.41
22	10.3.27.42/31	10.3.27.42 – 10.3.27.43	10.3.27.43
23	10.3.27.44/31	10.3.27.44 – 10.3.27.45	10.3.27.45
24	10.3.27.46/31	10.3.27.46 – 10.3.27.47	10.3.27.47
25	10.3.27.48/31	10.3.27.48 – 10.3.27.49	10.3.27.49
26	10.3.27.50/31	10.3.27.50 – 10.3.27.51	10.3.27.51
27	10.3.27.52/31	10.3.27.52 – 10.3.27.53	10.3.27.53
28	10.3.27.54/31	10.3.27.54 – 10.3.27.55	10.3.27.55
29	10.3.27.56/31	10.3.27.56 – 10.3.27.57	10.3.27.57
30	10.3.27.58/31	10.3.27.58 – 10.3.27.59	10.3.27.59
31	10.3.27.60/31	10.3.27.60 – 10.3.27.61	10.3.27.61
32	10.3.27.62/31	10.3.27.62 – 10.3.27.63	10.3.27.63
33	10.3.27.64/31	10.3.27.64 – 10.3.27.65	10.3.27.65
34	10.3.27.66/31	10.3.27.66 – 10.3.27.67	10.3.27.67
35	10.3.27.68/31	10.3.27.68 – 10.3.27.69	10.3.27.69
36	10.3.27.70/31	10.3.27.70 – 10.3.27.71	10.3.27.71
37	10.3.27.72/31	10.3.27.72 – 10.3.27.73	10.3.27.73
38	10.3.27.74/31	10.3.27.74 – 10.3.27.75	10.3.27.75
39	10.3.27.76/31	10.3.27.76 – 10.3.27.77	10.3.27.77
40	10.3.27.78/31	10.3.27.78 – 10.3.27.79	10.3.27.79
41	10.3.27.80/31	10.3.27.80 – 10.3.27.81	10.3.27.81
42	10.3.27.82/31	10.3.27.82 – 10.3.27.83	10.3.27.83
43	10.3.27.84/31	10.3.27.84 – 10.3.27.85	10.3.27.85
44	10.3.27.86/31	10.3.27.86 – 10.3.27.87	10.3.27.87
45	10.3.27.88/31	10.3.27.88 – 10.3.27.89	10.3.27.89
46	10.3.27.90/31	10.3.27.90 – 10.3.27.91	10.3.27.91
47	10.3.27.92/31	10.3.27.92 – 10.3.27.93	10.3.27.93
48	10.3.27.94/31	10.3.27.94 – 10.3.27.95	10.3.27.95
49	10.3.27.96/31	10.3.27.96 – 10.3.27.97	10.3.27.97
50	10.3.27.98/31	10.3.27.98 – 10.3.27.99	10.3.27.99
51	10.3.27.100/31	10.3.27.100 – 10.3.27.101	10.3.27.101
52	10.3.27.102/31	10.3.27.102 – 10.3.27.103	10.3.27.103
53	10.3.27.104/31	10.3.27.104 – 10.3.27.105	10.3.27.105
54	10.3.27.106/31	10.3.27.106 – 10.3.27.107	10.3.27.107
55	10.3.27.108/31	10.3.27.108 – 10.3.27.109	10.3.27.109
56	10.3.27.110/31	10.3.27.110 – 10.3.27.111	10.3.27.111
57	10.3.27.112/31	10.3.27.112 – 10.3.27.113	10.3.27.113
58	10.3.27.114/31	10.3.27.114 – 10.3.27.115	10.3.27.115
59	10.3.27.116/31	10.3.27.116 – 10.3.27.117	10.3.27.117
60	10.3.27.118/31	10.3.27.118 – 10.3.27.119	10.3.27.119
61	10.3.27.120/31	10.3.27.120 – 10.3.27.121	10.3.27.121
62	10.3.27.122/31	10.3.27.122 – 10.3.27.123	10.3.27.123
63	10.3.27.124/31	10.3.27.124 – 10.3.27.125	10.3.27.125
64	10.3.27.126/31	10.3.27.126 – 10.3.27.127	10.3.27.127
65	10.3.27.128/31	10.3.27.128 – 10.3.27.129	10.3.27.129
66	10.3.27.130/31	10.3.27.130 – 10.3.27.131	10.3.27.131
67	10.3.27.132/31	10.3.27.132 – 10.3.27.133	10.3.27.133
68	10.3.27.134/31	10.3.27.134 – 10.3.27.135	10.3.27.135
69	10.3.27.136/31	10.3.27.136 – 10.3.27.137	10.3.27.137
70	10.3.27.138/31	10.3.27.138 – 10.3.27.139	10.3.27.139
71	10.3.27.140/31	10.3.27.140 – 10.3.27.141	10.3.27.141
72	10.3.27.142/31	10.3.27.142 – 10.3.27.143	10.3.27.143
73	10.3.27.144/31	10.3.27.144 – 10.3.27.145	10.3.27.145
74	10.3.27.146/31	10.3.27.146 – 10.3.27.147	10.3.27.147
75	10.3.27.148/31	10.3.27.148 – 10.3.27.149	10.3.27.149
76	10.3.27.150/31	10.3.27.150 – 10.3.27.151	10.3.27.151
77	10.3.27.152/31	10.3.27.152 – 10.3.27.153	10.3.27.153
78	10.3.27.154/31	10.3.27.154 – 10.3.27.155	10.3.27.155
79	10.3.27.156/31	10.3.27.156 – 10.3.27.157	10.3.27.157
80	10.3.27.158/31	10.3.27.158 – 10.3.27.159	10.3.27.159
81	10.3.27.160/31	10.3.27.160 – 10.3.27.161	10.3.27.161
82	10.3.27.162/31	10.3.27.162 – 10.3.27.163	10.3.27.163
83	10.3.27.164/31	10.3.27.164 – 10.3.27.165	10.3.27.165
84	10.3.27.166/31	10.3.27.166 – 10.3.27.167	10.3.27.167
85	10.3.27.168/31	10.3.27.168 – 10.3.27.169	10.3.27.169
86	10.3.27.170/31	10.3.27.170 – 10.3.27.171	10.3.27.171
87	10.3.27.172/31	10.3.27.172 – 10.3.27.173	10.3.27.173
88	10.3.27.174/31	10.3.27.174 – 10.3.27.175	10.3.27.175
89	10.3.27.176/31	10.3.27.176 – 10.3.27.177	10.3.27.177
90	10.3.27.178/31	10.3.27.178 – 10.3.27.179	10.3.27.179
91	10.3.27.180/31	10.3.27.180 – 10.3.27.181	10.3.27.181
92	10.3.27.182/31	10.3.27.182 – 10.3.27.183	10.3.27.183
93	10.3.27.184/31	10.3.27.184 – 10.3.27.185	10.3.27.185
94	10.3.27.186/31	10.3.27.186 – 10.3.27.187	10.3.27.187
95	10.3.27.188/31	10.3.27.188 – 10.3.27.189	10.3.27.189
96	10.3.27.190/31	10.3.27.190 – 10.3.27.191	10.3.27.191
97	10.3.27.192/31	10.3.27.192 – 10.3.27.193	10.3.27.193
98	10.3.27.194/31	10.3.27.194 – 10.3.27.195	10.3.27.195
99	10.3.27.196/31	10.3.27.196 – 10.3.27.197	10.3.27.197
100	10.3.27.198/31	10.3.27.198 – 10.3.27.199	10.3.27.199
101	10.3.27.200/31	10.3.27.200 – 10.3.27.201	10.3.27.201
102	10.3.27.202/31	10.3.27.202 – 10.3.27.203	10.3.27.203
103	10.3.27.204/31	10.3.27.204 – 10.3.27.205	10.3.27.205
104	10.3.27.206/31	10.3.27.206 – 10.3.27.207	10.3.27.207
105	10.3.27.208/31	10.3.27.208 – 10.3.27.209	10.3.27.209
106	10.3.27.210/31	10.3.27.210 – 10.3.27.211	10.3.27.211
107	10.3.27.212/31	10.3.27.212 – 10.3.27.213	10.3.27.213
108	10.3.27.214/31	10.3.27.214 – 10.3.27.215	10.3.27.215
109	10.3.27.216/31	10.3.27.216 – 10.3.27.217	10.3.27.217
110	10.3.27.218/31	10.3.27.218 – 10.3.27.219	10.3.27.219
111	10.3.27.220/31	10.3.27.220 – 10.3.27.221	10.3.27.221
112	10.3.27.222/31	10.3.27.222 – 10.3.27.223	10.3.27.223
113	10.3.27.224/31	10.3.27.224 – 10.3.27.225	10.3.27.225
114	10.3.27.226/31	10.3.27.226 – 10.3.27.227	10.3.27.227
115	10.3.27.228/31	10.3.27.228 – 10.3.27.229	10.3.27.229
116	10.3.27.230/31	10.3.27.230 – 10.3.27.231	10.3.27.231
117	10.3.27.232/31	10.3.27.232 – 10.3.27.233	10.3.27.233
118	10.3.27.234/31	10.3.27.234 – 10.3.27.235	10.3.27.235
119	10.3.27.236/31	10.3.27.236 – 10.3.27.237	10.3.27.237
120	10.3.27.238/31	10.3.27.238 – 10.3.27.239	10.3.27.239
121	10.3.27.240/31	10.3.27.240 – 10.3.27.241	10.3.27.241
122	10.3.27.242/31	10.3.27.242 – 10.3.27.243	10.3.27.243
123	10.3.27.244/31	10.3.27.244 – 10.3.27.245	10.3.27.245
124	10.3.27.246/31	10.3.27.246 – 10.3.27.247	10.3.27.247
125	10.3.27.248/31	10.3.27.248 – 10.3.27.249	10.3.27.249
126	10.3.27.250/31	10.3.27.250 – 10.3.27.251	10.3.27.251
127	10.3.27.252/31	10.3.27.252 – 10.3.27.253	10.3.27.253
128	10.3.27.254/31	10.3.27.254 – 10.3.27.255	10.3.27.255

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 →