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)10.3.148.0/24

network10.3.148.0/24

broadcast10.3.148.255

first host10.3.148.1

last host10.3.148.254

subnet mask255.255.255.0

wildcard0.0.0.255

addresses256

usable hosts254

classA

ipcalc 10.3.148.0/24

address00001010.00000011.10010100.00000000

subnet mask11111111.11111111.11111111.00000000

network00001010.00000011.10010100.00000000

broadcast00001010.00000011.10010100.11111111

green = network part, grey = host part

hex0x0a039400

decimal168006656

reverse dns0.148.3.10.in-addr.arpa

ipv4-mapped::ffff:a03:9400

/24 split into /31 · 128 subnets

close ×

#	network	host range	broadcast
1	10.3.148.0/31	10.3.148.0 – 10.3.148.1	10.3.148.1
2	10.3.148.2/31	10.3.148.2 – 10.3.148.3	10.3.148.3
3	10.3.148.4/31	10.3.148.4 – 10.3.148.5	10.3.148.5
4	10.3.148.6/31	10.3.148.6 – 10.3.148.7	10.3.148.7
5	10.3.148.8/31	10.3.148.8 – 10.3.148.9	10.3.148.9
6	10.3.148.10/31	10.3.148.10 – 10.3.148.11	10.3.148.11
7	10.3.148.12/31	10.3.148.12 – 10.3.148.13	10.3.148.13
8	10.3.148.14/31	10.3.148.14 – 10.3.148.15	10.3.148.15
9	10.3.148.16/31	10.3.148.16 – 10.3.148.17	10.3.148.17
10	10.3.148.18/31	10.3.148.18 – 10.3.148.19	10.3.148.19
11	10.3.148.20/31	10.3.148.20 – 10.3.148.21	10.3.148.21
12	10.3.148.22/31	10.3.148.22 – 10.3.148.23	10.3.148.23
13	10.3.148.24/31	10.3.148.24 – 10.3.148.25	10.3.148.25
14	10.3.148.26/31	10.3.148.26 – 10.3.148.27	10.3.148.27
15	10.3.148.28/31	10.3.148.28 – 10.3.148.29	10.3.148.29
16	10.3.148.30/31	10.3.148.30 – 10.3.148.31	10.3.148.31
17	10.3.148.32/31	10.3.148.32 – 10.3.148.33	10.3.148.33
18	10.3.148.34/31	10.3.148.34 – 10.3.148.35	10.3.148.35
19	10.3.148.36/31	10.3.148.36 – 10.3.148.37	10.3.148.37
20	10.3.148.38/31	10.3.148.38 – 10.3.148.39	10.3.148.39
21	10.3.148.40/31	10.3.148.40 – 10.3.148.41	10.3.148.41
22	10.3.148.42/31	10.3.148.42 – 10.3.148.43	10.3.148.43
23	10.3.148.44/31	10.3.148.44 – 10.3.148.45	10.3.148.45
24	10.3.148.46/31	10.3.148.46 – 10.3.148.47	10.3.148.47
25	10.3.148.48/31	10.3.148.48 – 10.3.148.49	10.3.148.49
26	10.3.148.50/31	10.3.148.50 – 10.3.148.51	10.3.148.51
27	10.3.148.52/31	10.3.148.52 – 10.3.148.53	10.3.148.53
28	10.3.148.54/31	10.3.148.54 – 10.3.148.55	10.3.148.55
29	10.3.148.56/31	10.3.148.56 – 10.3.148.57	10.3.148.57
30	10.3.148.58/31	10.3.148.58 – 10.3.148.59	10.3.148.59
31	10.3.148.60/31	10.3.148.60 – 10.3.148.61	10.3.148.61
32	10.3.148.62/31	10.3.148.62 – 10.3.148.63	10.3.148.63
33	10.3.148.64/31	10.3.148.64 – 10.3.148.65	10.3.148.65
34	10.3.148.66/31	10.3.148.66 – 10.3.148.67	10.3.148.67
35	10.3.148.68/31	10.3.148.68 – 10.3.148.69	10.3.148.69
36	10.3.148.70/31	10.3.148.70 – 10.3.148.71	10.3.148.71
37	10.3.148.72/31	10.3.148.72 – 10.3.148.73	10.3.148.73
38	10.3.148.74/31	10.3.148.74 – 10.3.148.75	10.3.148.75
39	10.3.148.76/31	10.3.148.76 – 10.3.148.77	10.3.148.77
40	10.3.148.78/31	10.3.148.78 – 10.3.148.79	10.3.148.79
41	10.3.148.80/31	10.3.148.80 – 10.3.148.81	10.3.148.81
42	10.3.148.82/31	10.3.148.82 – 10.3.148.83	10.3.148.83
43	10.3.148.84/31	10.3.148.84 – 10.3.148.85	10.3.148.85
44	10.3.148.86/31	10.3.148.86 – 10.3.148.87	10.3.148.87
45	10.3.148.88/31	10.3.148.88 – 10.3.148.89	10.3.148.89
46	10.3.148.90/31	10.3.148.90 – 10.3.148.91	10.3.148.91
47	10.3.148.92/31	10.3.148.92 – 10.3.148.93	10.3.148.93
48	10.3.148.94/31	10.3.148.94 – 10.3.148.95	10.3.148.95
49	10.3.148.96/31	10.3.148.96 – 10.3.148.97	10.3.148.97
50	10.3.148.98/31	10.3.148.98 – 10.3.148.99	10.3.148.99
51	10.3.148.100/31	10.3.148.100 – 10.3.148.101	10.3.148.101
52	10.3.148.102/31	10.3.148.102 – 10.3.148.103	10.3.148.103
53	10.3.148.104/31	10.3.148.104 – 10.3.148.105	10.3.148.105
54	10.3.148.106/31	10.3.148.106 – 10.3.148.107	10.3.148.107
55	10.3.148.108/31	10.3.148.108 – 10.3.148.109	10.3.148.109
56	10.3.148.110/31	10.3.148.110 – 10.3.148.111	10.3.148.111
57	10.3.148.112/31	10.3.148.112 – 10.3.148.113	10.3.148.113
58	10.3.148.114/31	10.3.148.114 – 10.3.148.115	10.3.148.115
59	10.3.148.116/31	10.3.148.116 – 10.3.148.117	10.3.148.117
60	10.3.148.118/31	10.3.148.118 – 10.3.148.119	10.3.148.119
61	10.3.148.120/31	10.3.148.120 – 10.3.148.121	10.3.148.121
62	10.3.148.122/31	10.3.148.122 – 10.3.148.123	10.3.148.123
63	10.3.148.124/31	10.3.148.124 – 10.3.148.125	10.3.148.125
64	10.3.148.126/31	10.3.148.126 – 10.3.148.127	10.3.148.127
65	10.3.148.128/31	10.3.148.128 – 10.3.148.129	10.3.148.129
66	10.3.148.130/31	10.3.148.130 – 10.3.148.131	10.3.148.131
67	10.3.148.132/31	10.3.148.132 – 10.3.148.133	10.3.148.133
68	10.3.148.134/31	10.3.148.134 – 10.3.148.135	10.3.148.135
69	10.3.148.136/31	10.3.148.136 – 10.3.148.137	10.3.148.137
70	10.3.148.138/31	10.3.148.138 – 10.3.148.139	10.3.148.139
71	10.3.148.140/31	10.3.148.140 – 10.3.148.141	10.3.148.141
72	10.3.148.142/31	10.3.148.142 – 10.3.148.143	10.3.148.143
73	10.3.148.144/31	10.3.148.144 – 10.3.148.145	10.3.148.145
74	10.3.148.146/31	10.3.148.146 – 10.3.148.147	10.3.148.147
75	10.3.148.148/31	10.3.148.148 – 10.3.148.149	10.3.148.149
76	10.3.148.150/31	10.3.148.150 – 10.3.148.151	10.3.148.151
77	10.3.148.152/31	10.3.148.152 – 10.3.148.153	10.3.148.153
78	10.3.148.154/31	10.3.148.154 – 10.3.148.155	10.3.148.155
79	10.3.148.156/31	10.3.148.156 – 10.3.148.157	10.3.148.157
80	10.3.148.158/31	10.3.148.158 – 10.3.148.159	10.3.148.159
81	10.3.148.160/31	10.3.148.160 – 10.3.148.161	10.3.148.161
82	10.3.148.162/31	10.3.148.162 – 10.3.148.163	10.3.148.163
83	10.3.148.164/31	10.3.148.164 – 10.3.148.165	10.3.148.165
84	10.3.148.166/31	10.3.148.166 – 10.3.148.167	10.3.148.167
85	10.3.148.168/31	10.3.148.168 – 10.3.148.169	10.3.148.169
86	10.3.148.170/31	10.3.148.170 – 10.3.148.171	10.3.148.171
87	10.3.148.172/31	10.3.148.172 – 10.3.148.173	10.3.148.173
88	10.3.148.174/31	10.3.148.174 – 10.3.148.175	10.3.148.175
89	10.3.148.176/31	10.3.148.176 – 10.3.148.177	10.3.148.177
90	10.3.148.178/31	10.3.148.178 – 10.3.148.179	10.3.148.179
91	10.3.148.180/31	10.3.148.180 – 10.3.148.181	10.3.148.181
92	10.3.148.182/31	10.3.148.182 – 10.3.148.183	10.3.148.183
93	10.3.148.184/31	10.3.148.184 – 10.3.148.185	10.3.148.185
94	10.3.148.186/31	10.3.148.186 – 10.3.148.187	10.3.148.187
95	10.3.148.188/31	10.3.148.188 – 10.3.148.189	10.3.148.189
96	10.3.148.190/31	10.3.148.190 – 10.3.148.191	10.3.148.191
97	10.3.148.192/31	10.3.148.192 – 10.3.148.193	10.3.148.193
98	10.3.148.194/31	10.3.148.194 – 10.3.148.195	10.3.148.195
99	10.3.148.196/31	10.3.148.196 – 10.3.148.197	10.3.148.197
100	10.3.148.198/31	10.3.148.198 – 10.3.148.199	10.3.148.199
101	10.3.148.200/31	10.3.148.200 – 10.3.148.201	10.3.148.201
102	10.3.148.202/31	10.3.148.202 – 10.3.148.203	10.3.148.203
103	10.3.148.204/31	10.3.148.204 – 10.3.148.205	10.3.148.205
104	10.3.148.206/31	10.3.148.206 – 10.3.148.207	10.3.148.207
105	10.3.148.208/31	10.3.148.208 – 10.3.148.209	10.3.148.209
106	10.3.148.210/31	10.3.148.210 – 10.3.148.211	10.3.148.211
107	10.3.148.212/31	10.3.148.212 – 10.3.148.213	10.3.148.213
108	10.3.148.214/31	10.3.148.214 – 10.3.148.215	10.3.148.215
109	10.3.148.216/31	10.3.148.216 – 10.3.148.217	10.3.148.217
110	10.3.148.218/31	10.3.148.218 – 10.3.148.219	10.3.148.219
111	10.3.148.220/31	10.3.148.220 – 10.3.148.221	10.3.148.221
112	10.3.148.222/31	10.3.148.222 – 10.3.148.223	10.3.148.223
113	10.3.148.224/31	10.3.148.224 – 10.3.148.225	10.3.148.225
114	10.3.148.226/31	10.3.148.226 – 10.3.148.227	10.3.148.227
115	10.3.148.228/31	10.3.148.228 – 10.3.148.229	10.3.148.229
116	10.3.148.230/31	10.3.148.230 – 10.3.148.231	10.3.148.231
117	10.3.148.232/31	10.3.148.232 – 10.3.148.233	10.3.148.233
118	10.3.148.234/31	10.3.148.234 – 10.3.148.235	10.3.148.235
119	10.3.148.236/31	10.3.148.236 – 10.3.148.237	10.3.148.237
120	10.3.148.238/31	10.3.148.238 – 10.3.148.239	10.3.148.239
121	10.3.148.240/31	10.3.148.240 – 10.3.148.241	10.3.148.241
122	10.3.148.242/31	10.3.148.242 – 10.3.148.243	10.3.148.243
123	10.3.148.244/31	10.3.148.244 – 10.3.148.245	10.3.148.245
124	10.3.148.246/31	10.3.148.246 – 10.3.148.247	10.3.148.247
125	10.3.148.248/31	10.3.148.248 – 10.3.148.249	10.3.148.249
126	10.3.148.250/31	10.3.148.250 – 10.3.148.251	10.3.148.251
127	10.3.148.252/31	10.3.148.252 – 10.3.148.253	10.3.148.253
128	10.3.148.254/31	10.3.148.254 – 10.3.148.255	10.3.148.255

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 →