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)10.3.49.0/24

network10.3.49.0/24

broadcast10.3.49.255

first host10.3.49.1

last host10.3.49.254

subnet mask255.255.255.0

wildcard0.0.0.255

addresses256

usable hosts254

classA

ipcalc 10.3.49.0/24

address00001010.00000011.00110001.00000000

subnet mask11111111.11111111.11111111.00000000

network00001010.00000011.00110001.00000000

broadcast00001010.00000011.00110001.11111111

green = network part, grey = host part

hex0x0a033100

decimal167981312

reverse dns0.49.3.10.in-addr.arpa

ipv4-mapped::ffff:a03:3100

/24 split into /31 · 128 subnets

close ×

#	network	host range	broadcast
1	10.3.49.0/31	10.3.49.0 – 10.3.49.1	10.3.49.1
2	10.3.49.2/31	10.3.49.2 – 10.3.49.3	10.3.49.3
3	10.3.49.4/31	10.3.49.4 – 10.3.49.5	10.3.49.5
4	10.3.49.6/31	10.3.49.6 – 10.3.49.7	10.3.49.7
5	10.3.49.8/31	10.3.49.8 – 10.3.49.9	10.3.49.9
6	10.3.49.10/31	10.3.49.10 – 10.3.49.11	10.3.49.11
7	10.3.49.12/31	10.3.49.12 – 10.3.49.13	10.3.49.13
8	10.3.49.14/31	10.3.49.14 – 10.3.49.15	10.3.49.15
9	10.3.49.16/31	10.3.49.16 – 10.3.49.17	10.3.49.17
10	10.3.49.18/31	10.3.49.18 – 10.3.49.19	10.3.49.19
11	10.3.49.20/31	10.3.49.20 – 10.3.49.21	10.3.49.21
12	10.3.49.22/31	10.3.49.22 – 10.3.49.23	10.3.49.23
13	10.3.49.24/31	10.3.49.24 – 10.3.49.25	10.3.49.25
14	10.3.49.26/31	10.3.49.26 – 10.3.49.27	10.3.49.27
15	10.3.49.28/31	10.3.49.28 – 10.3.49.29	10.3.49.29
16	10.3.49.30/31	10.3.49.30 – 10.3.49.31	10.3.49.31
17	10.3.49.32/31	10.3.49.32 – 10.3.49.33	10.3.49.33
18	10.3.49.34/31	10.3.49.34 – 10.3.49.35	10.3.49.35
19	10.3.49.36/31	10.3.49.36 – 10.3.49.37	10.3.49.37
20	10.3.49.38/31	10.3.49.38 – 10.3.49.39	10.3.49.39
21	10.3.49.40/31	10.3.49.40 – 10.3.49.41	10.3.49.41
22	10.3.49.42/31	10.3.49.42 – 10.3.49.43	10.3.49.43
23	10.3.49.44/31	10.3.49.44 – 10.3.49.45	10.3.49.45
24	10.3.49.46/31	10.3.49.46 – 10.3.49.47	10.3.49.47
25	10.3.49.48/31	10.3.49.48 – 10.3.49.49	10.3.49.49
26	10.3.49.50/31	10.3.49.50 – 10.3.49.51	10.3.49.51
27	10.3.49.52/31	10.3.49.52 – 10.3.49.53	10.3.49.53
28	10.3.49.54/31	10.3.49.54 – 10.3.49.55	10.3.49.55
29	10.3.49.56/31	10.3.49.56 – 10.3.49.57	10.3.49.57
30	10.3.49.58/31	10.3.49.58 – 10.3.49.59	10.3.49.59
31	10.3.49.60/31	10.3.49.60 – 10.3.49.61	10.3.49.61
32	10.3.49.62/31	10.3.49.62 – 10.3.49.63	10.3.49.63
33	10.3.49.64/31	10.3.49.64 – 10.3.49.65	10.3.49.65
34	10.3.49.66/31	10.3.49.66 – 10.3.49.67	10.3.49.67
35	10.3.49.68/31	10.3.49.68 – 10.3.49.69	10.3.49.69
36	10.3.49.70/31	10.3.49.70 – 10.3.49.71	10.3.49.71
37	10.3.49.72/31	10.3.49.72 – 10.3.49.73	10.3.49.73
38	10.3.49.74/31	10.3.49.74 – 10.3.49.75	10.3.49.75
39	10.3.49.76/31	10.3.49.76 – 10.3.49.77	10.3.49.77
40	10.3.49.78/31	10.3.49.78 – 10.3.49.79	10.3.49.79
41	10.3.49.80/31	10.3.49.80 – 10.3.49.81	10.3.49.81
42	10.3.49.82/31	10.3.49.82 – 10.3.49.83	10.3.49.83
43	10.3.49.84/31	10.3.49.84 – 10.3.49.85	10.3.49.85
44	10.3.49.86/31	10.3.49.86 – 10.3.49.87	10.3.49.87
45	10.3.49.88/31	10.3.49.88 – 10.3.49.89	10.3.49.89
46	10.3.49.90/31	10.3.49.90 – 10.3.49.91	10.3.49.91
47	10.3.49.92/31	10.3.49.92 – 10.3.49.93	10.3.49.93
48	10.3.49.94/31	10.3.49.94 – 10.3.49.95	10.3.49.95
49	10.3.49.96/31	10.3.49.96 – 10.3.49.97	10.3.49.97
50	10.3.49.98/31	10.3.49.98 – 10.3.49.99	10.3.49.99
51	10.3.49.100/31	10.3.49.100 – 10.3.49.101	10.3.49.101
52	10.3.49.102/31	10.3.49.102 – 10.3.49.103	10.3.49.103
53	10.3.49.104/31	10.3.49.104 – 10.3.49.105	10.3.49.105
54	10.3.49.106/31	10.3.49.106 – 10.3.49.107	10.3.49.107
55	10.3.49.108/31	10.3.49.108 – 10.3.49.109	10.3.49.109
56	10.3.49.110/31	10.3.49.110 – 10.3.49.111	10.3.49.111
57	10.3.49.112/31	10.3.49.112 – 10.3.49.113	10.3.49.113
58	10.3.49.114/31	10.3.49.114 – 10.3.49.115	10.3.49.115
59	10.3.49.116/31	10.3.49.116 – 10.3.49.117	10.3.49.117
60	10.3.49.118/31	10.3.49.118 – 10.3.49.119	10.3.49.119
61	10.3.49.120/31	10.3.49.120 – 10.3.49.121	10.3.49.121
62	10.3.49.122/31	10.3.49.122 – 10.3.49.123	10.3.49.123
63	10.3.49.124/31	10.3.49.124 – 10.3.49.125	10.3.49.125
64	10.3.49.126/31	10.3.49.126 – 10.3.49.127	10.3.49.127
65	10.3.49.128/31	10.3.49.128 – 10.3.49.129	10.3.49.129
66	10.3.49.130/31	10.3.49.130 – 10.3.49.131	10.3.49.131
67	10.3.49.132/31	10.3.49.132 – 10.3.49.133	10.3.49.133
68	10.3.49.134/31	10.3.49.134 – 10.3.49.135	10.3.49.135
69	10.3.49.136/31	10.3.49.136 – 10.3.49.137	10.3.49.137
70	10.3.49.138/31	10.3.49.138 – 10.3.49.139	10.3.49.139
71	10.3.49.140/31	10.3.49.140 – 10.3.49.141	10.3.49.141
72	10.3.49.142/31	10.3.49.142 – 10.3.49.143	10.3.49.143
73	10.3.49.144/31	10.3.49.144 – 10.3.49.145	10.3.49.145
74	10.3.49.146/31	10.3.49.146 – 10.3.49.147	10.3.49.147
75	10.3.49.148/31	10.3.49.148 – 10.3.49.149	10.3.49.149
76	10.3.49.150/31	10.3.49.150 – 10.3.49.151	10.3.49.151
77	10.3.49.152/31	10.3.49.152 – 10.3.49.153	10.3.49.153
78	10.3.49.154/31	10.3.49.154 – 10.3.49.155	10.3.49.155
79	10.3.49.156/31	10.3.49.156 – 10.3.49.157	10.3.49.157
80	10.3.49.158/31	10.3.49.158 – 10.3.49.159	10.3.49.159
81	10.3.49.160/31	10.3.49.160 – 10.3.49.161	10.3.49.161
82	10.3.49.162/31	10.3.49.162 – 10.3.49.163	10.3.49.163
83	10.3.49.164/31	10.3.49.164 – 10.3.49.165	10.3.49.165
84	10.3.49.166/31	10.3.49.166 – 10.3.49.167	10.3.49.167
85	10.3.49.168/31	10.3.49.168 – 10.3.49.169	10.3.49.169
86	10.3.49.170/31	10.3.49.170 – 10.3.49.171	10.3.49.171
87	10.3.49.172/31	10.3.49.172 – 10.3.49.173	10.3.49.173
88	10.3.49.174/31	10.3.49.174 – 10.3.49.175	10.3.49.175
89	10.3.49.176/31	10.3.49.176 – 10.3.49.177	10.3.49.177
90	10.3.49.178/31	10.3.49.178 – 10.3.49.179	10.3.49.179
91	10.3.49.180/31	10.3.49.180 – 10.3.49.181	10.3.49.181
92	10.3.49.182/31	10.3.49.182 – 10.3.49.183	10.3.49.183
93	10.3.49.184/31	10.3.49.184 – 10.3.49.185	10.3.49.185
94	10.3.49.186/31	10.3.49.186 – 10.3.49.187	10.3.49.187
95	10.3.49.188/31	10.3.49.188 – 10.3.49.189	10.3.49.189
96	10.3.49.190/31	10.3.49.190 – 10.3.49.191	10.3.49.191
97	10.3.49.192/31	10.3.49.192 – 10.3.49.193	10.3.49.193
98	10.3.49.194/31	10.3.49.194 – 10.3.49.195	10.3.49.195
99	10.3.49.196/31	10.3.49.196 – 10.3.49.197	10.3.49.197
100	10.3.49.198/31	10.3.49.198 – 10.3.49.199	10.3.49.199
101	10.3.49.200/31	10.3.49.200 – 10.3.49.201	10.3.49.201
102	10.3.49.202/31	10.3.49.202 – 10.3.49.203	10.3.49.203
103	10.3.49.204/31	10.3.49.204 – 10.3.49.205	10.3.49.205
104	10.3.49.206/31	10.3.49.206 – 10.3.49.207	10.3.49.207
105	10.3.49.208/31	10.3.49.208 – 10.3.49.209	10.3.49.209
106	10.3.49.210/31	10.3.49.210 – 10.3.49.211	10.3.49.211
107	10.3.49.212/31	10.3.49.212 – 10.3.49.213	10.3.49.213
108	10.3.49.214/31	10.3.49.214 – 10.3.49.215	10.3.49.215
109	10.3.49.216/31	10.3.49.216 – 10.3.49.217	10.3.49.217
110	10.3.49.218/31	10.3.49.218 – 10.3.49.219	10.3.49.219
111	10.3.49.220/31	10.3.49.220 – 10.3.49.221	10.3.49.221
112	10.3.49.222/31	10.3.49.222 – 10.3.49.223	10.3.49.223
113	10.3.49.224/31	10.3.49.224 – 10.3.49.225	10.3.49.225
114	10.3.49.226/31	10.3.49.226 – 10.3.49.227	10.3.49.227
115	10.3.49.228/31	10.3.49.228 – 10.3.49.229	10.3.49.229
116	10.3.49.230/31	10.3.49.230 – 10.3.49.231	10.3.49.231
117	10.3.49.232/31	10.3.49.232 – 10.3.49.233	10.3.49.233
118	10.3.49.234/31	10.3.49.234 – 10.3.49.235	10.3.49.235
119	10.3.49.236/31	10.3.49.236 – 10.3.49.237	10.3.49.237
120	10.3.49.238/31	10.3.49.238 – 10.3.49.239	10.3.49.239
121	10.3.49.240/31	10.3.49.240 – 10.3.49.241	10.3.49.241
122	10.3.49.242/31	10.3.49.242 – 10.3.49.243	10.3.49.243
123	10.3.49.244/31	10.3.49.244 – 10.3.49.245	10.3.49.245
124	10.3.49.246/31	10.3.49.246 – 10.3.49.247	10.3.49.247
125	10.3.49.248/31	10.3.49.248 – 10.3.49.249	10.3.49.249
126	10.3.49.250/31	10.3.49.250 – 10.3.49.251	10.3.49.251
127	10.3.49.252/31	10.3.49.252 – 10.3.49.253	10.3.49.253
128	10.3.49.254/31	10.3.49.254 – 10.3.49.255	10.3.49.255

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 →