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)10.3.48.0/24

network10.3.48.0/24

broadcast10.3.48.255

first host10.3.48.1

last host10.3.48.254

subnet mask255.255.255.0

wildcard0.0.0.255

addresses256

usable hosts254

classA

ipcalc 10.3.48.0/24

address00001010.00000011.00110000.00000000

subnet mask11111111.11111111.11111111.00000000

network00001010.00000011.00110000.00000000

broadcast00001010.00000011.00110000.11111111

green = network part, grey = host part

hex0x0a033000

decimal167981056

reverse dns0.48.3.10.in-addr.arpa

ipv4-mapped::ffff:a03:3000

/24 split into /31 · 128 subnets

close ×

#	network	host range	broadcast
1	10.3.48.0/31	10.3.48.0 – 10.3.48.1	10.3.48.1
2	10.3.48.2/31	10.3.48.2 – 10.3.48.3	10.3.48.3
3	10.3.48.4/31	10.3.48.4 – 10.3.48.5	10.3.48.5
4	10.3.48.6/31	10.3.48.6 – 10.3.48.7	10.3.48.7
5	10.3.48.8/31	10.3.48.8 – 10.3.48.9	10.3.48.9
6	10.3.48.10/31	10.3.48.10 – 10.3.48.11	10.3.48.11
7	10.3.48.12/31	10.3.48.12 – 10.3.48.13	10.3.48.13
8	10.3.48.14/31	10.3.48.14 – 10.3.48.15	10.3.48.15
9	10.3.48.16/31	10.3.48.16 – 10.3.48.17	10.3.48.17
10	10.3.48.18/31	10.3.48.18 – 10.3.48.19	10.3.48.19
11	10.3.48.20/31	10.3.48.20 – 10.3.48.21	10.3.48.21
12	10.3.48.22/31	10.3.48.22 – 10.3.48.23	10.3.48.23
13	10.3.48.24/31	10.3.48.24 – 10.3.48.25	10.3.48.25
14	10.3.48.26/31	10.3.48.26 – 10.3.48.27	10.3.48.27
15	10.3.48.28/31	10.3.48.28 – 10.3.48.29	10.3.48.29
16	10.3.48.30/31	10.3.48.30 – 10.3.48.31	10.3.48.31
17	10.3.48.32/31	10.3.48.32 – 10.3.48.33	10.3.48.33
18	10.3.48.34/31	10.3.48.34 – 10.3.48.35	10.3.48.35
19	10.3.48.36/31	10.3.48.36 – 10.3.48.37	10.3.48.37
20	10.3.48.38/31	10.3.48.38 – 10.3.48.39	10.3.48.39
21	10.3.48.40/31	10.3.48.40 – 10.3.48.41	10.3.48.41
22	10.3.48.42/31	10.3.48.42 – 10.3.48.43	10.3.48.43
23	10.3.48.44/31	10.3.48.44 – 10.3.48.45	10.3.48.45
24	10.3.48.46/31	10.3.48.46 – 10.3.48.47	10.3.48.47
25	10.3.48.48/31	10.3.48.48 – 10.3.48.49	10.3.48.49
26	10.3.48.50/31	10.3.48.50 – 10.3.48.51	10.3.48.51
27	10.3.48.52/31	10.3.48.52 – 10.3.48.53	10.3.48.53
28	10.3.48.54/31	10.3.48.54 – 10.3.48.55	10.3.48.55
29	10.3.48.56/31	10.3.48.56 – 10.3.48.57	10.3.48.57
30	10.3.48.58/31	10.3.48.58 – 10.3.48.59	10.3.48.59
31	10.3.48.60/31	10.3.48.60 – 10.3.48.61	10.3.48.61
32	10.3.48.62/31	10.3.48.62 – 10.3.48.63	10.3.48.63
33	10.3.48.64/31	10.3.48.64 – 10.3.48.65	10.3.48.65
34	10.3.48.66/31	10.3.48.66 – 10.3.48.67	10.3.48.67
35	10.3.48.68/31	10.3.48.68 – 10.3.48.69	10.3.48.69
36	10.3.48.70/31	10.3.48.70 – 10.3.48.71	10.3.48.71
37	10.3.48.72/31	10.3.48.72 – 10.3.48.73	10.3.48.73
38	10.3.48.74/31	10.3.48.74 – 10.3.48.75	10.3.48.75
39	10.3.48.76/31	10.3.48.76 – 10.3.48.77	10.3.48.77
40	10.3.48.78/31	10.3.48.78 – 10.3.48.79	10.3.48.79
41	10.3.48.80/31	10.3.48.80 – 10.3.48.81	10.3.48.81
42	10.3.48.82/31	10.3.48.82 – 10.3.48.83	10.3.48.83
43	10.3.48.84/31	10.3.48.84 – 10.3.48.85	10.3.48.85
44	10.3.48.86/31	10.3.48.86 – 10.3.48.87	10.3.48.87
45	10.3.48.88/31	10.3.48.88 – 10.3.48.89	10.3.48.89
46	10.3.48.90/31	10.3.48.90 – 10.3.48.91	10.3.48.91
47	10.3.48.92/31	10.3.48.92 – 10.3.48.93	10.3.48.93
48	10.3.48.94/31	10.3.48.94 – 10.3.48.95	10.3.48.95
49	10.3.48.96/31	10.3.48.96 – 10.3.48.97	10.3.48.97
50	10.3.48.98/31	10.3.48.98 – 10.3.48.99	10.3.48.99
51	10.3.48.100/31	10.3.48.100 – 10.3.48.101	10.3.48.101
52	10.3.48.102/31	10.3.48.102 – 10.3.48.103	10.3.48.103
53	10.3.48.104/31	10.3.48.104 – 10.3.48.105	10.3.48.105
54	10.3.48.106/31	10.3.48.106 – 10.3.48.107	10.3.48.107
55	10.3.48.108/31	10.3.48.108 – 10.3.48.109	10.3.48.109
56	10.3.48.110/31	10.3.48.110 – 10.3.48.111	10.3.48.111
57	10.3.48.112/31	10.3.48.112 – 10.3.48.113	10.3.48.113
58	10.3.48.114/31	10.3.48.114 – 10.3.48.115	10.3.48.115
59	10.3.48.116/31	10.3.48.116 – 10.3.48.117	10.3.48.117
60	10.3.48.118/31	10.3.48.118 – 10.3.48.119	10.3.48.119
61	10.3.48.120/31	10.3.48.120 – 10.3.48.121	10.3.48.121
62	10.3.48.122/31	10.3.48.122 – 10.3.48.123	10.3.48.123
63	10.3.48.124/31	10.3.48.124 – 10.3.48.125	10.3.48.125
64	10.3.48.126/31	10.3.48.126 – 10.3.48.127	10.3.48.127
65	10.3.48.128/31	10.3.48.128 – 10.3.48.129	10.3.48.129
66	10.3.48.130/31	10.3.48.130 – 10.3.48.131	10.3.48.131
67	10.3.48.132/31	10.3.48.132 – 10.3.48.133	10.3.48.133
68	10.3.48.134/31	10.3.48.134 – 10.3.48.135	10.3.48.135
69	10.3.48.136/31	10.3.48.136 – 10.3.48.137	10.3.48.137
70	10.3.48.138/31	10.3.48.138 – 10.3.48.139	10.3.48.139
71	10.3.48.140/31	10.3.48.140 – 10.3.48.141	10.3.48.141
72	10.3.48.142/31	10.3.48.142 – 10.3.48.143	10.3.48.143
73	10.3.48.144/31	10.3.48.144 – 10.3.48.145	10.3.48.145
74	10.3.48.146/31	10.3.48.146 – 10.3.48.147	10.3.48.147
75	10.3.48.148/31	10.3.48.148 – 10.3.48.149	10.3.48.149
76	10.3.48.150/31	10.3.48.150 – 10.3.48.151	10.3.48.151
77	10.3.48.152/31	10.3.48.152 – 10.3.48.153	10.3.48.153
78	10.3.48.154/31	10.3.48.154 – 10.3.48.155	10.3.48.155
79	10.3.48.156/31	10.3.48.156 – 10.3.48.157	10.3.48.157
80	10.3.48.158/31	10.3.48.158 – 10.3.48.159	10.3.48.159
81	10.3.48.160/31	10.3.48.160 – 10.3.48.161	10.3.48.161
82	10.3.48.162/31	10.3.48.162 – 10.3.48.163	10.3.48.163
83	10.3.48.164/31	10.3.48.164 – 10.3.48.165	10.3.48.165
84	10.3.48.166/31	10.3.48.166 – 10.3.48.167	10.3.48.167
85	10.3.48.168/31	10.3.48.168 – 10.3.48.169	10.3.48.169
86	10.3.48.170/31	10.3.48.170 – 10.3.48.171	10.3.48.171
87	10.3.48.172/31	10.3.48.172 – 10.3.48.173	10.3.48.173
88	10.3.48.174/31	10.3.48.174 – 10.3.48.175	10.3.48.175
89	10.3.48.176/31	10.3.48.176 – 10.3.48.177	10.3.48.177
90	10.3.48.178/31	10.3.48.178 – 10.3.48.179	10.3.48.179
91	10.3.48.180/31	10.3.48.180 – 10.3.48.181	10.3.48.181
92	10.3.48.182/31	10.3.48.182 – 10.3.48.183	10.3.48.183
93	10.3.48.184/31	10.3.48.184 – 10.3.48.185	10.3.48.185
94	10.3.48.186/31	10.3.48.186 – 10.3.48.187	10.3.48.187
95	10.3.48.188/31	10.3.48.188 – 10.3.48.189	10.3.48.189
96	10.3.48.190/31	10.3.48.190 – 10.3.48.191	10.3.48.191
97	10.3.48.192/31	10.3.48.192 – 10.3.48.193	10.3.48.193
98	10.3.48.194/31	10.3.48.194 – 10.3.48.195	10.3.48.195
99	10.3.48.196/31	10.3.48.196 – 10.3.48.197	10.3.48.197
100	10.3.48.198/31	10.3.48.198 – 10.3.48.199	10.3.48.199
101	10.3.48.200/31	10.3.48.200 – 10.3.48.201	10.3.48.201
102	10.3.48.202/31	10.3.48.202 – 10.3.48.203	10.3.48.203
103	10.3.48.204/31	10.3.48.204 – 10.3.48.205	10.3.48.205
104	10.3.48.206/31	10.3.48.206 – 10.3.48.207	10.3.48.207
105	10.3.48.208/31	10.3.48.208 – 10.3.48.209	10.3.48.209
106	10.3.48.210/31	10.3.48.210 – 10.3.48.211	10.3.48.211
107	10.3.48.212/31	10.3.48.212 – 10.3.48.213	10.3.48.213
108	10.3.48.214/31	10.3.48.214 – 10.3.48.215	10.3.48.215
109	10.3.48.216/31	10.3.48.216 – 10.3.48.217	10.3.48.217
110	10.3.48.218/31	10.3.48.218 – 10.3.48.219	10.3.48.219
111	10.3.48.220/31	10.3.48.220 – 10.3.48.221	10.3.48.221
112	10.3.48.222/31	10.3.48.222 – 10.3.48.223	10.3.48.223
113	10.3.48.224/31	10.3.48.224 – 10.3.48.225	10.3.48.225
114	10.3.48.226/31	10.3.48.226 – 10.3.48.227	10.3.48.227
115	10.3.48.228/31	10.3.48.228 – 10.3.48.229	10.3.48.229
116	10.3.48.230/31	10.3.48.230 – 10.3.48.231	10.3.48.231
117	10.3.48.232/31	10.3.48.232 – 10.3.48.233	10.3.48.233
118	10.3.48.234/31	10.3.48.234 – 10.3.48.235	10.3.48.235
119	10.3.48.236/31	10.3.48.236 – 10.3.48.237	10.3.48.237
120	10.3.48.238/31	10.3.48.238 – 10.3.48.239	10.3.48.239
121	10.3.48.240/31	10.3.48.240 – 10.3.48.241	10.3.48.241
122	10.3.48.242/31	10.3.48.242 – 10.3.48.243	10.3.48.243
123	10.3.48.244/31	10.3.48.244 – 10.3.48.245	10.3.48.245
124	10.3.48.246/31	10.3.48.246 – 10.3.48.247	10.3.48.247
125	10.3.48.248/31	10.3.48.248 – 10.3.48.249	10.3.48.249
126	10.3.48.250/31	10.3.48.250 – 10.3.48.251	10.3.48.251
127	10.3.48.252/31	10.3.48.252 – 10.3.48.253	10.3.48.253
128	10.3.48.254/31	10.3.48.254 – 10.3.48.255	10.3.48.255

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 →