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)10.151.44.0/23

network10.151.44.0/23

broadcast10.151.45.255

first host10.151.44.1

last host10.151.45.254

subnet mask255.255.254.0

wildcard0.0.1.255

addresses512

usable hosts510

classA

ipcalc 10.151.44.0/23

address00001010.10010111.00101100.00000000

subnet mask11111111.11111111.11111110.00000000

network00001010.10010111.00101100.00000000

broadcast00001010.10010111.00101101.11111111

green = network part, grey = host part

hex0x0a972c00

decimal177679360

reverse dns0.44.151.10.in-addr.arpa

ipv4-mapped::ffff:a97:2c00

/23 split into /30 · 128 subnets

close ×

#	network	host range	broadcast
1	10.151.44.0/30	10.151.44.1 – 10.151.44.2	10.151.44.3
2	10.151.44.4/30	10.151.44.5 – 10.151.44.6	10.151.44.7
3	10.151.44.8/30	10.151.44.9 – 10.151.44.10	10.151.44.11
4	10.151.44.12/30	10.151.44.13 – 10.151.44.14	10.151.44.15
5	10.151.44.16/30	10.151.44.17 – 10.151.44.18	10.151.44.19
6	10.151.44.20/30	10.151.44.21 – 10.151.44.22	10.151.44.23
7	10.151.44.24/30	10.151.44.25 – 10.151.44.26	10.151.44.27
8	10.151.44.28/30	10.151.44.29 – 10.151.44.30	10.151.44.31
9	10.151.44.32/30	10.151.44.33 – 10.151.44.34	10.151.44.35
10	10.151.44.36/30	10.151.44.37 – 10.151.44.38	10.151.44.39
11	10.151.44.40/30	10.151.44.41 – 10.151.44.42	10.151.44.43
12	10.151.44.44/30	10.151.44.45 – 10.151.44.46	10.151.44.47
13	10.151.44.48/30	10.151.44.49 – 10.151.44.50	10.151.44.51
14	10.151.44.52/30	10.151.44.53 – 10.151.44.54	10.151.44.55
15	10.151.44.56/30	10.151.44.57 – 10.151.44.58	10.151.44.59
16	10.151.44.60/30	10.151.44.61 – 10.151.44.62	10.151.44.63
17	10.151.44.64/30	10.151.44.65 – 10.151.44.66	10.151.44.67
18	10.151.44.68/30	10.151.44.69 – 10.151.44.70	10.151.44.71
19	10.151.44.72/30	10.151.44.73 – 10.151.44.74	10.151.44.75
20	10.151.44.76/30	10.151.44.77 – 10.151.44.78	10.151.44.79
21	10.151.44.80/30	10.151.44.81 – 10.151.44.82	10.151.44.83
22	10.151.44.84/30	10.151.44.85 – 10.151.44.86	10.151.44.87
23	10.151.44.88/30	10.151.44.89 – 10.151.44.90	10.151.44.91
24	10.151.44.92/30	10.151.44.93 – 10.151.44.94	10.151.44.95
25	10.151.44.96/30	10.151.44.97 – 10.151.44.98	10.151.44.99
26	10.151.44.100/30	10.151.44.101 – 10.151.44.102	10.151.44.103
27	10.151.44.104/30	10.151.44.105 – 10.151.44.106	10.151.44.107
28	10.151.44.108/30	10.151.44.109 – 10.151.44.110	10.151.44.111
29	10.151.44.112/30	10.151.44.113 – 10.151.44.114	10.151.44.115
30	10.151.44.116/30	10.151.44.117 – 10.151.44.118	10.151.44.119
31	10.151.44.120/30	10.151.44.121 – 10.151.44.122	10.151.44.123
32	10.151.44.124/30	10.151.44.125 – 10.151.44.126	10.151.44.127
33	10.151.44.128/30	10.151.44.129 – 10.151.44.130	10.151.44.131
34	10.151.44.132/30	10.151.44.133 – 10.151.44.134	10.151.44.135
35	10.151.44.136/30	10.151.44.137 – 10.151.44.138	10.151.44.139
36	10.151.44.140/30	10.151.44.141 – 10.151.44.142	10.151.44.143
37	10.151.44.144/30	10.151.44.145 – 10.151.44.146	10.151.44.147
38	10.151.44.148/30	10.151.44.149 – 10.151.44.150	10.151.44.151
39	10.151.44.152/30	10.151.44.153 – 10.151.44.154	10.151.44.155
40	10.151.44.156/30	10.151.44.157 – 10.151.44.158	10.151.44.159
41	10.151.44.160/30	10.151.44.161 – 10.151.44.162	10.151.44.163
42	10.151.44.164/30	10.151.44.165 – 10.151.44.166	10.151.44.167
43	10.151.44.168/30	10.151.44.169 – 10.151.44.170	10.151.44.171
44	10.151.44.172/30	10.151.44.173 – 10.151.44.174	10.151.44.175
45	10.151.44.176/30	10.151.44.177 – 10.151.44.178	10.151.44.179
46	10.151.44.180/30	10.151.44.181 – 10.151.44.182	10.151.44.183
47	10.151.44.184/30	10.151.44.185 – 10.151.44.186	10.151.44.187
48	10.151.44.188/30	10.151.44.189 – 10.151.44.190	10.151.44.191
49	10.151.44.192/30	10.151.44.193 – 10.151.44.194	10.151.44.195
50	10.151.44.196/30	10.151.44.197 – 10.151.44.198	10.151.44.199
51	10.151.44.200/30	10.151.44.201 – 10.151.44.202	10.151.44.203
52	10.151.44.204/30	10.151.44.205 – 10.151.44.206	10.151.44.207
53	10.151.44.208/30	10.151.44.209 – 10.151.44.210	10.151.44.211
54	10.151.44.212/30	10.151.44.213 – 10.151.44.214	10.151.44.215
55	10.151.44.216/30	10.151.44.217 – 10.151.44.218	10.151.44.219
56	10.151.44.220/30	10.151.44.221 – 10.151.44.222	10.151.44.223
57	10.151.44.224/30	10.151.44.225 – 10.151.44.226	10.151.44.227
58	10.151.44.228/30	10.151.44.229 – 10.151.44.230	10.151.44.231
59	10.151.44.232/30	10.151.44.233 – 10.151.44.234	10.151.44.235
60	10.151.44.236/30	10.151.44.237 – 10.151.44.238	10.151.44.239
61	10.151.44.240/30	10.151.44.241 – 10.151.44.242	10.151.44.243
62	10.151.44.244/30	10.151.44.245 – 10.151.44.246	10.151.44.247
63	10.151.44.248/30	10.151.44.249 – 10.151.44.250	10.151.44.251
64	10.151.44.252/30	10.151.44.253 – 10.151.44.254	10.151.44.255
65	10.151.45.0/30	10.151.45.1 – 10.151.45.2	10.151.45.3
66	10.151.45.4/30	10.151.45.5 – 10.151.45.6	10.151.45.7
67	10.151.45.8/30	10.151.45.9 – 10.151.45.10	10.151.45.11
68	10.151.45.12/30	10.151.45.13 – 10.151.45.14	10.151.45.15
69	10.151.45.16/30	10.151.45.17 – 10.151.45.18	10.151.45.19
70	10.151.45.20/30	10.151.45.21 – 10.151.45.22	10.151.45.23
71	10.151.45.24/30	10.151.45.25 – 10.151.45.26	10.151.45.27
72	10.151.45.28/30	10.151.45.29 – 10.151.45.30	10.151.45.31
73	10.151.45.32/30	10.151.45.33 – 10.151.45.34	10.151.45.35
74	10.151.45.36/30	10.151.45.37 – 10.151.45.38	10.151.45.39
75	10.151.45.40/30	10.151.45.41 – 10.151.45.42	10.151.45.43
76	10.151.45.44/30	10.151.45.45 – 10.151.45.46	10.151.45.47
77	10.151.45.48/30	10.151.45.49 – 10.151.45.50	10.151.45.51
78	10.151.45.52/30	10.151.45.53 – 10.151.45.54	10.151.45.55
79	10.151.45.56/30	10.151.45.57 – 10.151.45.58	10.151.45.59
80	10.151.45.60/30	10.151.45.61 – 10.151.45.62	10.151.45.63
81	10.151.45.64/30	10.151.45.65 – 10.151.45.66	10.151.45.67
82	10.151.45.68/30	10.151.45.69 – 10.151.45.70	10.151.45.71
83	10.151.45.72/30	10.151.45.73 – 10.151.45.74	10.151.45.75
84	10.151.45.76/30	10.151.45.77 – 10.151.45.78	10.151.45.79
85	10.151.45.80/30	10.151.45.81 – 10.151.45.82	10.151.45.83
86	10.151.45.84/30	10.151.45.85 – 10.151.45.86	10.151.45.87
87	10.151.45.88/30	10.151.45.89 – 10.151.45.90	10.151.45.91
88	10.151.45.92/30	10.151.45.93 – 10.151.45.94	10.151.45.95
89	10.151.45.96/30	10.151.45.97 – 10.151.45.98	10.151.45.99
90	10.151.45.100/30	10.151.45.101 – 10.151.45.102	10.151.45.103
91	10.151.45.104/30	10.151.45.105 – 10.151.45.106	10.151.45.107
92	10.151.45.108/30	10.151.45.109 – 10.151.45.110	10.151.45.111
93	10.151.45.112/30	10.151.45.113 – 10.151.45.114	10.151.45.115
94	10.151.45.116/30	10.151.45.117 – 10.151.45.118	10.151.45.119
95	10.151.45.120/30	10.151.45.121 – 10.151.45.122	10.151.45.123
96	10.151.45.124/30	10.151.45.125 – 10.151.45.126	10.151.45.127
97	10.151.45.128/30	10.151.45.129 – 10.151.45.130	10.151.45.131
98	10.151.45.132/30	10.151.45.133 – 10.151.45.134	10.151.45.135
99	10.151.45.136/30	10.151.45.137 – 10.151.45.138	10.151.45.139
100	10.151.45.140/30	10.151.45.141 – 10.151.45.142	10.151.45.143
101	10.151.45.144/30	10.151.45.145 – 10.151.45.146	10.151.45.147
102	10.151.45.148/30	10.151.45.149 – 10.151.45.150	10.151.45.151
103	10.151.45.152/30	10.151.45.153 – 10.151.45.154	10.151.45.155
104	10.151.45.156/30	10.151.45.157 – 10.151.45.158	10.151.45.159
105	10.151.45.160/30	10.151.45.161 – 10.151.45.162	10.151.45.163
106	10.151.45.164/30	10.151.45.165 – 10.151.45.166	10.151.45.167
107	10.151.45.168/30	10.151.45.169 – 10.151.45.170	10.151.45.171
108	10.151.45.172/30	10.151.45.173 – 10.151.45.174	10.151.45.175
109	10.151.45.176/30	10.151.45.177 – 10.151.45.178	10.151.45.179
110	10.151.45.180/30	10.151.45.181 – 10.151.45.182	10.151.45.183
111	10.151.45.184/30	10.151.45.185 – 10.151.45.186	10.151.45.187
112	10.151.45.188/30	10.151.45.189 – 10.151.45.190	10.151.45.191
113	10.151.45.192/30	10.151.45.193 – 10.151.45.194	10.151.45.195
114	10.151.45.196/30	10.151.45.197 – 10.151.45.198	10.151.45.199
115	10.151.45.200/30	10.151.45.201 – 10.151.45.202	10.151.45.203
116	10.151.45.204/30	10.151.45.205 – 10.151.45.206	10.151.45.207
117	10.151.45.208/30	10.151.45.209 – 10.151.45.210	10.151.45.211
118	10.151.45.212/30	10.151.45.213 – 10.151.45.214	10.151.45.215
119	10.151.45.216/30	10.151.45.217 – 10.151.45.218	10.151.45.219
120	10.151.45.220/30	10.151.45.221 – 10.151.45.222	10.151.45.223
121	10.151.45.224/30	10.151.45.225 – 10.151.45.226	10.151.45.227
122	10.151.45.228/30	10.151.45.229 – 10.151.45.230	10.151.45.231
123	10.151.45.232/30	10.151.45.233 – 10.151.45.234	10.151.45.235
124	10.151.45.236/30	10.151.45.237 – 10.151.45.238	10.151.45.239
125	10.151.45.240/30	10.151.45.241 – 10.151.45.242	10.151.45.243
126	10.151.45.244/30	10.151.45.245 – 10.151.45.246	10.151.45.247
127	10.151.45.248/30	10.151.45.249 – 10.151.45.250	10.151.45.251
128	10.151.45.252/30	10.151.45.253 – 10.151.45.254	10.151.45.255

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 →