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)10.149.40.0/24

network10.149.40.0/24

broadcast10.149.40.255

first host10.149.40.1

last host10.149.40.254

subnet mask255.255.255.0

wildcard0.0.0.255

addresses256

usable hosts254

classA

ipcalc 10.149.40.0/24

address00001010.10010101.00101000.00000000

subnet mask11111111.11111111.11111111.00000000

network00001010.10010101.00101000.00000000

broadcast00001010.10010101.00101000.11111111

green = network part, grey = host part

hex0x0a952800

decimal177547264

reverse dns0.40.149.10.in-addr.arpa

ipv4-mapped::ffff:a95:2800

/24 split into /31 · 128 subnets

close ×

#	network	host range	broadcast
1	10.149.40.0/31	10.149.40.0 – 10.149.40.1	10.149.40.1
2	10.149.40.2/31	10.149.40.2 – 10.149.40.3	10.149.40.3
3	10.149.40.4/31	10.149.40.4 – 10.149.40.5	10.149.40.5
4	10.149.40.6/31	10.149.40.6 – 10.149.40.7	10.149.40.7
5	10.149.40.8/31	10.149.40.8 – 10.149.40.9	10.149.40.9
6	10.149.40.10/31	10.149.40.10 – 10.149.40.11	10.149.40.11
7	10.149.40.12/31	10.149.40.12 – 10.149.40.13	10.149.40.13
8	10.149.40.14/31	10.149.40.14 – 10.149.40.15	10.149.40.15
9	10.149.40.16/31	10.149.40.16 – 10.149.40.17	10.149.40.17
10	10.149.40.18/31	10.149.40.18 – 10.149.40.19	10.149.40.19
11	10.149.40.20/31	10.149.40.20 – 10.149.40.21	10.149.40.21
12	10.149.40.22/31	10.149.40.22 – 10.149.40.23	10.149.40.23
13	10.149.40.24/31	10.149.40.24 – 10.149.40.25	10.149.40.25
14	10.149.40.26/31	10.149.40.26 – 10.149.40.27	10.149.40.27
15	10.149.40.28/31	10.149.40.28 – 10.149.40.29	10.149.40.29
16	10.149.40.30/31	10.149.40.30 – 10.149.40.31	10.149.40.31
17	10.149.40.32/31	10.149.40.32 – 10.149.40.33	10.149.40.33
18	10.149.40.34/31	10.149.40.34 – 10.149.40.35	10.149.40.35
19	10.149.40.36/31	10.149.40.36 – 10.149.40.37	10.149.40.37
20	10.149.40.38/31	10.149.40.38 – 10.149.40.39	10.149.40.39
21	10.149.40.40/31	10.149.40.40 – 10.149.40.41	10.149.40.41
22	10.149.40.42/31	10.149.40.42 – 10.149.40.43	10.149.40.43
23	10.149.40.44/31	10.149.40.44 – 10.149.40.45	10.149.40.45
24	10.149.40.46/31	10.149.40.46 – 10.149.40.47	10.149.40.47
25	10.149.40.48/31	10.149.40.48 – 10.149.40.49	10.149.40.49
26	10.149.40.50/31	10.149.40.50 – 10.149.40.51	10.149.40.51
27	10.149.40.52/31	10.149.40.52 – 10.149.40.53	10.149.40.53
28	10.149.40.54/31	10.149.40.54 – 10.149.40.55	10.149.40.55
29	10.149.40.56/31	10.149.40.56 – 10.149.40.57	10.149.40.57
30	10.149.40.58/31	10.149.40.58 – 10.149.40.59	10.149.40.59
31	10.149.40.60/31	10.149.40.60 – 10.149.40.61	10.149.40.61
32	10.149.40.62/31	10.149.40.62 – 10.149.40.63	10.149.40.63
33	10.149.40.64/31	10.149.40.64 – 10.149.40.65	10.149.40.65
34	10.149.40.66/31	10.149.40.66 – 10.149.40.67	10.149.40.67
35	10.149.40.68/31	10.149.40.68 – 10.149.40.69	10.149.40.69
36	10.149.40.70/31	10.149.40.70 – 10.149.40.71	10.149.40.71
37	10.149.40.72/31	10.149.40.72 – 10.149.40.73	10.149.40.73
38	10.149.40.74/31	10.149.40.74 – 10.149.40.75	10.149.40.75
39	10.149.40.76/31	10.149.40.76 – 10.149.40.77	10.149.40.77
40	10.149.40.78/31	10.149.40.78 – 10.149.40.79	10.149.40.79
41	10.149.40.80/31	10.149.40.80 – 10.149.40.81	10.149.40.81
42	10.149.40.82/31	10.149.40.82 – 10.149.40.83	10.149.40.83
43	10.149.40.84/31	10.149.40.84 – 10.149.40.85	10.149.40.85
44	10.149.40.86/31	10.149.40.86 – 10.149.40.87	10.149.40.87
45	10.149.40.88/31	10.149.40.88 – 10.149.40.89	10.149.40.89
46	10.149.40.90/31	10.149.40.90 – 10.149.40.91	10.149.40.91
47	10.149.40.92/31	10.149.40.92 – 10.149.40.93	10.149.40.93
48	10.149.40.94/31	10.149.40.94 – 10.149.40.95	10.149.40.95
49	10.149.40.96/31	10.149.40.96 – 10.149.40.97	10.149.40.97
50	10.149.40.98/31	10.149.40.98 – 10.149.40.99	10.149.40.99
51	10.149.40.100/31	10.149.40.100 – 10.149.40.101	10.149.40.101
52	10.149.40.102/31	10.149.40.102 – 10.149.40.103	10.149.40.103
53	10.149.40.104/31	10.149.40.104 – 10.149.40.105	10.149.40.105
54	10.149.40.106/31	10.149.40.106 – 10.149.40.107	10.149.40.107
55	10.149.40.108/31	10.149.40.108 – 10.149.40.109	10.149.40.109
56	10.149.40.110/31	10.149.40.110 – 10.149.40.111	10.149.40.111
57	10.149.40.112/31	10.149.40.112 – 10.149.40.113	10.149.40.113
58	10.149.40.114/31	10.149.40.114 – 10.149.40.115	10.149.40.115
59	10.149.40.116/31	10.149.40.116 – 10.149.40.117	10.149.40.117
60	10.149.40.118/31	10.149.40.118 – 10.149.40.119	10.149.40.119
61	10.149.40.120/31	10.149.40.120 – 10.149.40.121	10.149.40.121
62	10.149.40.122/31	10.149.40.122 – 10.149.40.123	10.149.40.123
63	10.149.40.124/31	10.149.40.124 – 10.149.40.125	10.149.40.125
64	10.149.40.126/31	10.149.40.126 – 10.149.40.127	10.149.40.127
65	10.149.40.128/31	10.149.40.128 – 10.149.40.129	10.149.40.129
66	10.149.40.130/31	10.149.40.130 – 10.149.40.131	10.149.40.131
67	10.149.40.132/31	10.149.40.132 – 10.149.40.133	10.149.40.133
68	10.149.40.134/31	10.149.40.134 – 10.149.40.135	10.149.40.135
69	10.149.40.136/31	10.149.40.136 – 10.149.40.137	10.149.40.137
70	10.149.40.138/31	10.149.40.138 – 10.149.40.139	10.149.40.139
71	10.149.40.140/31	10.149.40.140 – 10.149.40.141	10.149.40.141
72	10.149.40.142/31	10.149.40.142 – 10.149.40.143	10.149.40.143
73	10.149.40.144/31	10.149.40.144 – 10.149.40.145	10.149.40.145
74	10.149.40.146/31	10.149.40.146 – 10.149.40.147	10.149.40.147
75	10.149.40.148/31	10.149.40.148 – 10.149.40.149	10.149.40.149
76	10.149.40.150/31	10.149.40.150 – 10.149.40.151	10.149.40.151
77	10.149.40.152/31	10.149.40.152 – 10.149.40.153	10.149.40.153
78	10.149.40.154/31	10.149.40.154 – 10.149.40.155	10.149.40.155
79	10.149.40.156/31	10.149.40.156 – 10.149.40.157	10.149.40.157
80	10.149.40.158/31	10.149.40.158 – 10.149.40.159	10.149.40.159
81	10.149.40.160/31	10.149.40.160 – 10.149.40.161	10.149.40.161
82	10.149.40.162/31	10.149.40.162 – 10.149.40.163	10.149.40.163
83	10.149.40.164/31	10.149.40.164 – 10.149.40.165	10.149.40.165
84	10.149.40.166/31	10.149.40.166 – 10.149.40.167	10.149.40.167
85	10.149.40.168/31	10.149.40.168 – 10.149.40.169	10.149.40.169
86	10.149.40.170/31	10.149.40.170 – 10.149.40.171	10.149.40.171
87	10.149.40.172/31	10.149.40.172 – 10.149.40.173	10.149.40.173
88	10.149.40.174/31	10.149.40.174 – 10.149.40.175	10.149.40.175
89	10.149.40.176/31	10.149.40.176 – 10.149.40.177	10.149.40.177
90	10.149.40.178/31	10.149.40.178 – 10.149.40.179	10.149.40.179
91	10.149.40.180/31	10.149.40.180 – 10.149.40.181	10.149.40.181
92	10.149.40.182/31	10.149.40.182 – 10.149.40.183	10.149.40.183
93	10.149.40.184/31	10.149.40.184 – 10.149.40.185	10.149.40.185
94	10.149.40.186/31	10.149.40.186 – 10.149.40.187	10.149.40.187
95	10.149.40.188/31	10.149.40.188 – 10.149.40.189	10.149.40.189
96	10.149.40.190/31	10.149.40.190 – 10.149.40.191	10.149.40.191
97	10.149.40.192/31	10.149.40.192 – 10.149.40.193	10.149.40.193
98	10.149.40.194/31	10.149.40.194 – 10.149.40.195	10.149.40.195
99	10.149.40.196/31	10.149.40.196 – 10.149.40.197	10.149.40.197
100	10.149.40.198/31	10.149.40.198 – 10.149.40.199	10.149.40.199
101	10.149.40.200/31	10.149.40.200 – 10.149.40.201	10.149.40.201
102	10.149.40.202/31	10.149.40.202 – 10.149.40.203	10.149.40.203
103	10.149.40.204/31	10.149.40.204 – 10.149.40.205	10.149.40.205
104	10.149.40.206/31	10.149.40.206 – 10.149.40.207	10.149.40.207
105	10.149.40.208/31	10.149.40.208 – 10.149.40.209	10.149.40.209
106	10.149.40.210/31	10.149.40.210 – 10.149.40.211	10.149.40.211
107	10.149.40.212/31	10.149.40.212 – 10.149.40.213	10.149.40.213
108	10.149.40.214/31	10.149.40.214 – 10.149.40.215	10.149.40.215
109	10.149.40.216/31	10.149.40.216 – 10.149.40.217	10.149.40.217
110	10.149.40.218/31	10.149.40.218 – 10.149.40.219	10.149.40.219
111	10.149.40.220/31	10.149.40.220 – 10.149.40.221	10.149.40.221
112	10.149.40.222/31	10.149.40.222 – 10.149.40.223	10.149.40.223
113	10.149.40.224/31	10.149.40.224 – 10.149.40.225	10.149.40.225
114	10.149.40.226/31	10.149.40.226 – 10.149.40.227	10.149.40.227
115	10.149.40.228/31	10.149.40.228 – 10.149.40.229	10.149.40.229
116	10.149.40.230/31	10.149.40.230 – 10.149.40.231	10.149.40.231
117	10.149.40.232/31	10.149.40.232 – 10.149.40.233	10.149.40.233
118	10.149.40.234/31	10.149.40.234 – 10.149.40.235	10.149.40.235
119	10.149.40.236/31	10.149.40.236 – 10.149.40.237	10.149.40.237
120	10.149.40.238/31	10.149.40.238 – 10.149.40.239	10.149.40.239
121	10.149.40.240/31	10.149.40.240 – 10.149.40.241	10.149.40.241
122	10.149.40.242/31	10.149.40.242 – 10.149.40.243	10.149.40.243
123	10.149.40.244/31	10.149.40.244 – 10.149.40.245	10.149.40.245
124	10.149.40.246/31	10.149.40.246 – 10.149.40.247	10.149.40.247
125	10.149.40.248/31	10.149.40.248 – 10.149.40.249	10.149.40.249
126	10.149.40.250/31	10.149.40.250 – 10.149.40.251	10.149.40.251
127	10.149.40.252/31	10.149.40.252 – 10.149.40.253	10.149.40.253
128	10.149.40.254/31	10.149.40.254 – 10.149.40.255	10.149.40.255

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 →