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)10.149.40.0/23

network10.149.40.0/23

broadcast10.149.41.255

first host10.149.40.1

last host10.149.41.254

subnet mask255.255.254.0

wildcard0.0.1.255

addresses512

usable hosts510

classA

ipcalc 10.149.40.0/23

address00001010.10010101.00101000.00000000

subnet mask11111111.11111111.11111110.00000000

network00001010.10010101.00101000.00000000

broadcast00001010.10010101.00101001.11111111

green = network part, grey = host part

hex0x0a952800

decimal177547264

reverse dns0.40.149.10.in-addr.arpa

ipv4-mapped::ffff:a95:2800

/23 split into /30 · 128 subnets

close ×

#	network	host range	broadcast
1	10.149.40.0/30	10.149.40.1 – 10.149.40.2	10.149.40.3
2	10.149.40.4/30	10.149.40.5 – 10.149.40.6	10.149.40.7
3	10.149.40.8/30	10.149.40.9 – 10.149.40.10	10.149.40.11
4	10.149.40.12/30	10.149.40.13 – 10.149.40.14	10.149.40.15
5	10.149.40.16/30	10.149.40.17 – 10.149.40.18	10.149.40.19
6	10.149.40.20/30	10.149.40.21 – 10.149.40.22	10.149.40.23
7	10.149.40.24/30	10.149.40.25 – 10.149.40.26	10.149.40.27
8	10.149.40.28/30	10.149.40.29 – 10.149.40.30	10.149.40.31
9	10.149.40.32/30	10.149.40.33 – 10.149.40.34	10.149.40.35
10	10.149.40.36/30	10.149.40.37 – 10.149.40.38	10.149.40.39
11	10.149.40.40/30	10.149.40.41 – 10.149.40.42	10.149.40.43
12	10.149.40.44/30	10.149.40.45 – 10.149.40.46	10.149.40.47
13	10.149.40.48/30	10.149.40.49 – 10.149.40.50	10.149.40.51
14	10.149.40.52/30	10.149.40.53 – 10.149.40.54	10.149.40.55
15	10.149.40.56/30	10.149.40.57 – 10.149.40.58	10.149.40.59
16	10.149.40.60/30	10.149.40.61 – 10.149.40.62	10.149.40.63
17	10.149.40.64/30	10.149.40.65 – 10.149.40.66	10.149.40.67
18	10.149.40.68/30	10.149.40.69 – 10.149.40.70	10.149.40.71
19	10.149.40.72/30	10.149.40.73 – 10.149.40.74	10.149.40.75
20	10.149.40.76/30	10.149.40.77 – 10.149.40.78	10.149.40.79
21	10.149.40.80/30	10.149.40.81 – 10.149.40.82	10.149.40.83
22	10.149.40.84/30	10.149.40.85 – 10.149.40.86	10.149.40.87
23	10.149.40.88/30	10.149.40.89 – 10.149.40.90	10.149.40.91
24	10.149.40.92/30	10.149.40.93 – 10.149.40.94	10.149.40.95
25	10.149.40.96/30	10.149.40.97 – 10.149.40.98	10.149.40.99
26	10.149.40.100/30	10.149.40.101 – 10.149.40.102	10.149.40.103
27	10.149.40.104/30	10.149.40.105 – 10.149.40.106	10.149.40.107
28	10.149.40.108/30	10.149.40.109 – 10.149.40.110	10.149.40.111
29	10.149.40.112/30	10.149.40.113 – 10.149.40.114	10.149.40.115
30	10.149.40.116/30	10.149.40.117 – 10.149.40.118	10.149.40.119
31	10.149.40.120/30	10.149.40.121 – 10.149.40.122	10.149.40.123
32	10.149.40.124/30	10.149.40.125 – 10.149.40.126	10.149.40.127
33	10.149.40.128/30	10.149.40.129 – 10.149.40.130	10.149.40.131
34	10.149.40.132/30	10.149.40.133 – 10.149.40.134	10.149.40.135
35	10.149.40.136/30	10.149.40.137 – 10.149.40.138	10.149.40.139
36	10.149.40.140/30	10.149.40.141 – 10.149.40.142	10.149.40.143
37	10.149.40.144/30	10.149.40.145 – 10.149.40.146	10.149.40.147
38	10.149.40.148/30	10.149.40.149 – 10.149.40.150	10.149.40.151
39	10.149.40.152/30	10.149.40.153 – 10.149.40.154	10.149.40.155
40	10.149.40.156/30	10.149.40.157 – 10.149.40.158	10.149.40.159
41	10.149.40.160/30	10.149.40.161 – 10.149.40.162	10.149.40.163
42	10.149.40.164/30	10.149.40.165 – 10.149.40.166	10.149.40.167
43	10.149.40.168/30	10.149.40.169 – 10.149.40.170	10.149.40.171
44	10.149.40.172/30	10.149.40.173 – 10.149.40.174	10.149.40.175
45	10.149.40.176/30	10.149.40.177 – 10.149.40.178	10.149.40.179
46	10.149.40.180/30	10.149.40.181 – 10.149.40.182	10.149.40.183
47	10.149.40.184/30	10.149.40.185 – 10.149.40.186	10.149.40.187
48	10.149.40.188/30	10.149.40.189 – 10.149.40.190	10.149.40.191
49	10.149.40.192/30	10.149.40.193 – 10.149.40.194	10.149.40.195
50	10.149.40.196/30	10.149.40.197 – 10.149.40.198	10.149.40.199
51	10.149.40.200/30	10.149.40.201 – 10.149.40.202	10.149.40.203
52	10.149.40.204/30	10.149.40.205 – 10.149.40.206	10.149.40.207
53	10.149.40.208/30	10.149.40.209 – 10.149.40.210	10.149.40.211
54	10.149.40.212/30	10.149.40.213 – 10.149.40.214	10.149.40.215
55	10.149.40.216/30	10.149.40.217 – 10.149.40.218	10.149.40.219
56	10.149.40.220/30	10.149.40.221 – 10.149.40.222	10.149.40.223
57	10.149.40.224/30	10.149.40.225 – 10.149.40.226	10.149.40.227
58	10.149.40.228/30	10.149.40.229 – 10.149.40.230	10.149.40.231
59	10.149.40.232/30	10.149.40.233 – 10.149.40.234	10.149.40.235
60	10.149.40.236/30	10.149.40.237 – 10.149.40.238	10.149.40.239
61	10.149.40.240/30	10.149.40.241 – 10.149.40.242	10.149.40.243
62	10.149.40.244/30	10.149.40.245 – 10.149.40.246	10.149.40.247
63	10.149.40.248/30	10.149.40.249 – 10.149.40.250	10.149.40.251
64	10.149.40.252/30	10.149.40.253 – 10.149.40.254	10.149.40.255
65	10.149.41.0/30	10.149.41.1 – 10.149.41.2	10.149.41.3
66	10.149.41.4/30	10.149.41.5 – 10.149.41.6	10.149.41.7
67	10.149.41.8/30	10.149.41.9 – 10.149.41.10	10.149.41.11
68	10.149.41.12/30	10.149.41.13 – 10.149.41.14	10.149.41.15
69	10.149.41.16/30	10.149.41.17 – 10.149.41.18	10.149.41.19
70	10.149.41.20/30	10.149.41.21 – 10.149.41.22	10.149.41.23
71	10.149.41.24/30	10.149.41.25 – 10.149.41.26	10.149.41.27
72	10.149.41.28/30	10.149.41.29 – 10.149.41.30	10.149.41.31
73	10.149.41.32/30	10.149.41.33 – 10.149.41.34	10.149.41.35
74	10.149.41.36/30	10.149.41.37 – 10.149.41.38	10.149.41.39
75	10.149.41.40/30	10.149.41.41 – 10.149.41.42	10.149.41.43
76	10.149.41.44/30	10.149.41.45 – 10.149.41.46	10.149.41.47
77	10.149.41.48/30	10.149.41.49 – 10.149.41.50	10.149.41.51
78	10.149.41.52/30	10.149.41.53 – 10.149.41.54	10.149.41.55
79	10.149.41.56/30	10.149.41.57 – 10.149.41.58	10.149.41.59
80	10.149.41.60/30	10.149.41.61 – 10.149.41.62	10.149.41.63
81	10.149.41.64/30	10.149.41.65 – 10.149.41.66	10.149.41.67
82	10.149.41.68/30	10.149.41.69 – 10.149.41.70	10.149.41.71
83	10.149.41.72/30	10.149.41.73 – 10.149.41.74	10.149.41.75
84	10.149.41.76/30	10.149.41.77 – 10.149.41.78	10.149.41.79
85	10.149.41.80/30	10.149.41.81 – 10.149.41.82	10.149.41.83
86	10.149.41.84/30	10.149.41.85 – 10.149.41.86	10.149.41.87
87	10.149.41.88/30	10.149.41.89 – 10.149.41.90	10.149.41.91
88	10.149.41.92/30	10.149.41.93 – 10.149.41.94	10.149.41.95
89	10.149.41.96/30	10.149.41.97 – 10.149.41.98	10.149.41.99
90	10.149.41.100/30	10.149.41.101 – 10.149.41.102	10.149.41.103
91	10.149.41.104/30	10.149.41.105 – 10.149.41.106	10.149.41.107
92	10.149.41.108/30	10.149.41.109 – 10.149.41.110	10.149.41.111
93	10.149.41.112/30	10.149.41.113 – 10.149.41.114	10.149.41.115
94	10.149.41.116/30	10.149.41.117 – 10.149.41.118	10.149.41.119
95	10.149.41.120/30	10.149.41.121 – 10.149.41.122	10.149.41.123
96	10.149.41.124/30	10.149.41.125 – 10.149.41.126	10.149.41.127
97	10.149.41.128/30	10.149.41.129 – 10.149.41.130	10.149.41.131
98	10.149.41.132/30	10.149.41.133 – 10.149.41.134	10.149.41.135
99	10.149.41.136/30	10.149.41.137 – 10.149.41.138	10.149.41.139
100	10.149.41.140/30	10.149.41.141 – 10.149.41.142	10.149.41.143
101	10.149.41.144/30	10.149.41.145 – 10.149.41.146	10.149.41.147
102	10.149.41.148/30	10.149.41.149 – 10.149.41.150	10.149.41.151
103	10.149.41.152/30	10.149.41.153 – 10.149.41.154	10.149.41.155
104	10.149.41.156/30	10.149.41.157 – 10.149.41.158	10.149.41.159
105	10.149.41.160/30	10.149.41.161 – 10.149.41.162	10.149.41.163
106	10.149.41.164/30	10.149.41.165 – 10.149.41.166	10.149.41.167
107	10.149.41.168/30	10.149.41.169 – 10.149.41.170	10.149.41.171
108	10.149.41.172/30	10.149.41.173 – 10.149.41.174	10.149.41.175
109	10.149.41.176/30	10.149.41.177 – 10.149.41.178	10.149.41.179
110	10.149.41.180/30	10.149.41.181 – 10.149.41.182	10.149.41.183
111	10.149.41.184/30	10.149.41.185 – 10.149.41.186	10.149.41.187
112	10.149.41.188/30	10.149.41.189 – 10.149.41.190	10.149.41.191
113	10.149.41.192/30	10.149.41.193 – 10.149.41.194	10.149.41.195
114	10.149.41.196/30	10.149.41.197 – 10.149.41.198	10.149.41.199
115	10.149.41.200/30	10.149.41.201 – 10.149.41.202	10.149.41.203
116	10.149.41.204/30	10.149.41.205 – 10.149.41.206	10.149.41.207
117	10.149.41.208/30	10.149.41.209 – 10.149.41.210	10.149.41.211
118	10.149.41.212/30	10.149.41.213 – 10.149.41.214	10.149.41.215
119	10.149.41.216/30	10.149.41.217 – 10.149.41.218	10.149.41.219
120	10.149.41.220/30	10.149.41.221 – 10.149.41.222	10.149.41.223
121	10.149.41.224/30	10.149.41.225 – 10.149.41.226	10.149.41.227
122	10.149.41.228/30	10.149.41.229 – 10.149.41.230	10.149.41.231
123	10.149.41.232/30	10.149.41.233 – 10.149.41.234	10.149.41.235
124	10.149.41.236/30	10.149.41.237 – 10.149.41.238	10.149.41.239
125	10.149.41.240/30	10.149.41.241 – 10.149.41.242	10.149.41.243
126	10.149.41.244/30	10.149.41.245 – 10.149.41.246	10.149.41.247
127	10.149.41.248/30	10.149.41.249 – 10.149.41.250	10.149.41.251
128	10.149.41.252/30	10.149.41.253 – 10.149.41.254	10.149.41.255

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 /23
/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	1
/24	255.255.255.0	256	254	2 split →
/25	255.255.255.128	128	126	4 split →
/26	255.255.255.192	64	62	8 split →
/27	255.255.255.224	32	30	16 split →
/28	255.255.255.240	16	14	32 split →
/29	255.255.255.248	8	6	64 split →
/30	255.255.255.252	4	2	128 split →
/31	255.255.255.254	2	2	256 split →
/32	255.255.255.255	1	1	512 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 →