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)10.3.241.0/24

network10.3.241.0/24

broadcast10.3.241.255

first host10.3.241.1

last host10.3.241.254

subnet mask255.255.255.0

wildcard0.0.0.255

addresses256

usable hosts254

classA

ipcalc 10.3.241.0/24

address00001010.00000011.11110001.00000000

subnet mask11111111.11111111.11111111.00000000

network00001010.00000011.11110001.00000000

broadcast00001010.00000011.11110001.11111111

green = network part, grey = host part

hex0x0a03f100

decimal168030464

reverse dns0.241.3.10.in-addr.arpa

ipv4-mapped::ffff:a03:f100

/24 split into /31 · 128 subnets

close ×

#	network	host range	broadcast
1	10.3.241.0/31	10.3.241.0 – 10.3.241.1	10.3.241.1
2	10.3.241.2/31	10.3.241.2 – 10.3.241.3	10.3.241.3
3	10.3.241.4/31	10.3.241.4 – 10.3.241.5	10.3.241.5
4	10.3.241.6/31	10.3.241.6 – 10.3.241.7	10.3.241.7
5	10.3.241.8/31	10.3.241.8 – 10.3.241.9	10.3.241.9
6	10.3.241.10/31	10.3.241.10 – 10.3.241.11	10.3.241.11
7	10.3.241.12/31	10.3.241.12 – 10.3.241.13	10.3.241.13
8	10.3.241.14/31	10.3.241.14 – 10.3.241.15	10.3.241.15
9	10.3.241.16/31	10.3.241.16 – 10.3.241.17	10.3.241.17
10	10.3.241.18/31	10.3.241.18 – 10.3.241.19	10.3.241.19
11	10.3.241.20/31	10.3.241.20 – 10.3.241.21	10.3.241.21
12	10.3.241.22/31	10.3.241.22 – 10.3.241.23	10.3.241.23
13	10.3.241.24/31	10.3.241.24 – 10.3.241.25	10.3.241.25
14	10.3.241.26/31	10.3.241.26 – 10.3.241.27	10.3.241.27
15	10.3.241.28/31	10.3.241.28 – 10.3.241.29	10.3.241.29
16	10.3.241.30/31	10.3.241.30 – 10.3.241.31	10.3.241.31
17	10.3.241.32/31	10.3.241.32 – 10.3.241.33	10.3.241.33
18	10.3.241.34/31	10.3.241.34 – 10.3.241.35	10.3.241.35
19	10.3.241.36/31	10.3.241.36 – 10.3.241.37	10.3.241.37
20	10.3.241.38/31	10.3.241.38 – 10.3.241.39	10.3.241.39
21	10.3.241.40/31	10.3.241.40 – 10.3.241.41	10.3.241.41
22	10.3.241.42/31	10.3.241.42 – 10.3.241.43	10.3.241.43
23	10.3.241.44/31	10.3.241.44 – 10.3.241.45	10.3.241.45
24	10.3.241.46/31	10.3.241.46 – 10.3.241.47	10.3.241.47
25	10.3.241.48/31	10.3.241.48 – 10.3.241.49	10.3.241.49
26	10.3.241.50/31	10.3.241.50 – 10.3.241.51	10.3.241.51
27	10.3.241.52/31	10.3.241.52 – 10.3.241.53	10.3.241.53
28	10.3.241.54/31	10.3.241.54 – 10.3.241.55	10.3.241.55
29	10.3.241.56/31	10.3.241.56 – 10.3.241.57	10.3.241.57
30	10.3.241.58/31	10.3.241.58 – 10.3.241.59	10.3.241.59
31	10.3.241.60/31	10.3.241.60 – 10.3.241.61	10.3.241.61
32	10.3.241.62/31	10.3.241.62 – 10.3.241.63	10.3.241.63
33	10.3.241.64/31	10.3.241.64 – 10.3.241.65	10.3.241.65
34	10.3.241.66/31	10.3.241.66 – 10.3.241.67	10.3.241.67
35	10.3.241.68/31	10.3.241.68 – 10.3.241.69	10.3.241.69
36	10.3.241.70/31	10.3.241.70 – 10.3.241.71	10.3.241.71
37	10.3.241.72/31	10.3.241.72 – 10.3.241.73	10.3.241.73
38	10.3.241.74/31	10.3.241.74 – 10.3.241.75	10.3.241.75
39	10.3.241.76/31	10.3.241.76 – 10.3.241.77	10.3.241.77
40	10.3.241.78/31	10.3.241.78 – 10.3.241.79	10.3.241.79
41	10.3.241.80/31	10.3.241.80 – 10.3.241.81	10.3.241.81
42	10.3.241.82/31	10.3.241.82 – 10.3.241.83	10.3.241.83
43	10.3.241.84/31	10.3.241.84 – 10.3.241.85	10.3.241.85
44	10.3.241.86/31	10.3.241.86 – 10.3.241.87	10.3.241.87
45	10.3.241.88/31	10.3.241.88 – 10.3.241.89	10.3.241.89
46	10.3.241.90/31	10.3.241.90 – 10.3.241.91	10.3.241.91
47	10.3.241.92/31	10.3.241.92 – 10.3.241.93	10.3.241.93
48	10.3.241.94/31	10.3.241.94 – 10.3.241.95	10.3.241.95
49	10.3.241.96/31	10.3.241.96 – 10.3.241.97	10.3.241.97
50	10.3.241.98/31	10.3.241.98 – 10.3.241.99	10.3.241.99
51	10.3.241.100/31	10.3.241.100 – 10.3.241.101	10.3.241.101
52	10.3.241.102/31	10.3.241.102 – 10.3.241.103	10.3.241.103
53	10.3.241.104/31	10.3.241.104 – 10.3.241.105	10.3.241.105
54	10.3.241.106/31	10.3.241.106 – 10.3.241.107	10.3.241.107
55	10.3.241.108/31	10.3.241.108 – 10.3.241.109	10.3.241.109
56	10.3.241.110/31	10.3.241.110 – 10.3.241.111	10.3.241.111
57	10.3.241.112/31	10.3.241.112 – 10.3.241.113	10.3.241.113
58	10.3.241.114/31	10.3.241.114 – 10.3.241.115	10.3.241.115
59	10.3.241.116/31	10.3.241.116 – 10.3.241.117	10.3.241.117
60	10.3.241.118/31	10.3.241.118 – 10.3.241.119	10.3.241.119
61	10.3.241.120/31	10.3.241.120 – 10.3.241.121	10.3.241.121
62	10.3.241.122/31	10.3.241.122 – 10.3.241.123	10.3.241.123
63	10.3.241.124/31	10.3.241.124 – 10.3.241.125	10.3.241.125
64	10.3.241.126/31	10.3.241.126 – 10.3.241.127	10.3.241.127
65	10.3.241.128/31	10.3.241.128 – 10.3.241.129	10.3.241.129
66	10.3.241.130/31	10.3.241.130 – 10.3.241.131	10.3.241.131
67	10.3.241.132/31	10.3.241.132 – 10.3.241.133	10.3.241.133
68	10.3.241.134/31	10.3.241.134 – 10.3.241.135	10.3.241.135
69	10.3.241.136/31	10.3.241.136 – 10.3.241.137	10.3.241.137
70	10.3.241.138/31	10.3.241.138 – 10.3.241.139	10.3.241.139
71	10.3.241.140/31	10.3.241.140 – 10.3.241.141	10.3.241.141
72	10.3.241.142/31	10.3.241.142 – 10.3.241.143	10.3.241.143
73	10.3.241.144/31	10.3.241.144 – 10.3.241.145	10.3.241.145
74	10.3.241.146/31	10.3.241.146 – 10.3.241.147	10.3.241.147
75	10.3.241.148/31	10.3.241.148 – 10.3.241.149	10.3.241.149
76	10.3.241.150/31	10.3.241.150 – 10.3.241.151	10.3.241.151
77	10.3.241.152/31	10.3.241.152 – 10.3.241.153	10.3.241.153
78	10.3.241.154/31	10.3.241.154 – 10.3.241.155	10.3.241.155
79	10.3.241.156/31	10.3.241.156 – 10.3.241.157	10.3.241.157
80	10.3.241.158/31	10.3.241.158 – 10.3.241.159	10.3.241.159
81	10.3.241.160/31	10.3.241.160 – 10.3.241.161	10.3.241.161
82	10.3.241.162/31	10.3.241.162 – 10.3.241.163	10.3.241.163
83	10.3.241.164/31	10.3.241.164 – 10.3.241.165	10.3.241.165
84	10.3.241.166/31	10.3.241.166 – 10.3.241.167	10.3.241.167
85	10.3.241.168/31	10.3.241.168 – 10.3.241.169	10.3.241.169
86	10.3.241.170/31	10.3.241.170 – 10.3.241.171	10.3.241.171
87	10.3.241.172/31	10.3.241.172 – 10.3.241.173	10.3.241.173
88	10.3.241.174/31	10.3.241.174 – 10.3.241.175	10.3.241.175
89	10.3.241.176/31	10.3.241.176 – 10.3.241.177	10.3.241.177
90	10.3.241.178/31	10.3.241.178 – 10.3.241.179	10.3.241.179
91	10.3.241.180/31	10.3.241.180 – 10.3.241.181	10.3.241.181
92	10.3.241.182/31	10.3.241.182 – 10.3.241.183	10.3.241.183
93	10.3.241.184/31	10.3.241.184 – 10.3.241.185	10.3.241.185
94	10.3.241.186/31	10.3.241.186 – 10.3.241.187	10.3.241.187
95	10.3.241.188/31	10.3.241.188 – 10.3.241.189	10.3.241.189
96	10.3.241.190/31	10.3.241.190 – 10.3.241.191	10.3.241.191
97	10.3.241.192/31	10.3.241.192 – 10.3.241.193	10.3.241.193
98	10.3.241.194/31	10.3.241.194 – 10.3.241.195	10.3.241.195
99	10.3.241.196/31	10.3.241.196 – 10.3.241.197	10.3.241.197
100	10.3.241.198/31	10.3.241.198 – 10.3.241.199	10.3.241.199
101	10.3.241.200/31	10.3.241.200 – 10.3.241.201	10.3.241.201
102	10.3.241.202/31	10.3.241.202 – 10.3.241.203	10.3.241.203
103	10.3.241.204/31	10.3.241.204 – 10.3.241.205	10.3.241.205
104	10.3.241.206/31	10.3.241.206 – 10.3.241.207	10.3.241.207
105	10.3.241.208/31	10.3.241.208 – 10.3.241.209	10.3.241.209
106	10.3.241.210/31	10.3.241.210 – 10.3.241.211	10.3.241.211
107	10.3.241.212/31	10.3.241.212 – 10.3.241.213	10.3.241.213
108	10.3.241.214/31	10.3.241.214 – 10.3.241.215	10.3.241.215
109	10.3.241.216/31	10.3.241.216 – 10.3.241.217	10.3.241.217
110	10.3.241.218/31	10.3.241.218 – 10.3.241.219	10.3.241.219
111	10.3.241.220/31	10.3.241.220 – 10.3.241.221	10.3.241.221
112	10.3.241.222/31	10.3.241.222 – 10.3.241.223	10.3.241.223
113	10.3.241.224/31	10.3.241.224 – 10.3.241.225	10.3.241.225
114	10.3.241.226/31	10.3.241.226 – 10.3.241.227	10.3.241.227
115	10.3.241.228/31	10.3.241.228 – 10.3.241.229	10.3.241.229
116	10.3.241.230/31	10.3.241.230 – 10.3.241.231	10.3.241.231
117	10.3.241.232/31	10.3.241.232 – 10.3.241.233	10.3.241.233
118	10.3.241.234/31	10.3.241.234 – 10.3.241.235	10.3.241.235
119	10.3.241.236/31	10.3.241.236 – 10.3.241.237	10.3.241.237
120	10.3.241.238/31	10.3.241.238 – 10.3.241.239	10.3.241.239
121	10.3.241.240/31	10.3.241.240 – 10.3.241.241	10.3.241.241
122	10.3.241.242/31	10.3.241.242 – 10.3.241.243	10.3.241.243
123	10.3.241.244/31	10.3.241.244 – 10.3.241.245	10.3.241.245
124	10.3.241.246/31	10.3.241.246 – 10.3.241.247	10.3.241.247
125	10.3.241.248/31	10.3.241.248 – 10.3.241.249	10.3.241.249
126	10.3.241.250/31	10.3.241.250 – 10.3.241.251	10.3.241.251
127	10.3.241.252/31	10.3.241.252 – 10.3.241.253	10.3.241.253
128	10.3.241.254/31	10.3.241.254 – 10.3.241.255	10.3.241.255

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 →