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)10.2.60.0/23

network10.2.60.0/23

broadcast10.2.61.255

first host10.2.60.1

last host10.2.61.254

subnet mask255.255.254.0

wildcard0.0.1.255

addresses512

usable hosts510

classA

ipcalc 10.2.60.0/23

address00001010.00000010.00111100.00000000

subnet mask11111111.11111111.11111110.00000000

network00001010.00000010.00111100.00000000

broadcast00001010.00000010.00111101.11111111

green = network part, grey = host part

hex0x0a023c00

decimal167918592

reverse dns0.60.2.10.in-addr.arpa

ipv4-mapped::ffff:a02:3c00

/23 split into /29 · 64 subnets

close ×

#	network	host range	broadcast
1	10.2.60.0/29	10.2.60.1 – 10.2.60.6	10.2.60.7
2	10.2.60.8/29	10.2.60.9 – 10.2.60.14	10.2.60.15
3	10.2.60.16/29	10.2.60.17 – 10.2.60.22	10.2.60.23
4	10.2.60.24/29	10.2.60.25 – 10.2.60.30	10.2.60.31
5	10.2.60.32/29	10.2.60.33 – 10.2.60.38	10.2.60.39
6	10.2.60.40/29	10.2.60.41 – 10.2.60.46	10.2.60.47
7	10.2.60.48/29	10.2.60.49 – 10.2.60.54	10.2.60.55
8	10.2.60.56/29	10.2.60.57 – 10.2.60.62	10.2.60.63
9	10.2.60.64/29	10.2.60.65 – 10.2.60.70	10.2.60.71
10	10.2.60.72/29	10.2.60.73 – 10.2.60.78	10.2.60.79
11	10.2.60.80/29	10.2.60.81 – 10.2.60.86	10.2.60.87
12	10.2.60.88/29	10.2.60.89 – 10.2.60.94	10.2.60.95
13	10.2.60.96/29	10.2.60.97 – 10.2.60.102	10.2.60.103
14	10.2.60.104/29	10.2.60.105 – 10.2.60.110	10.2.60.111
15	10.2.60.112/29	10.2.60.113 – 10.2.60.118	10.2.60.119
16	10.2.60.120/29	10.2.60.121 – 10.2.60.126	10.2.60.127
17	10.2.60.128/29	10.2.60.129 – 10.2.60.134	10.2.60.135
18	10.2.60.136/29	10.2.60.137 – 10.2.60.142	10.2.60.143
19	10.2.60.144/29	10.2.60.145 – 10.2.60.150	10.2.60.151
20	10.2.60.152/29	10.2.60.153 – 10.2.60.158	10.2.60.159
21	10.2.60.160/29	10.2.60.161 – 10.2.60.166	10.2.60.167
22	10.2.60.168/29	10.2.60.169 – 10.2.60.174	10.2.60.175
23	10.2.60.176/29	10.2.60.177 – 10.2.60.182	10.2.60.183
24	10.2.60.184/29	10.2.60.185 – 10.2.60.190	10.2.60.191
25	10.2.60.192/29	10.2.60.193 – 10.2.60.198	10.2.60.199
26	10.2.60.200/29	10.2.60.201 – 10.2.60.206	10.2.60.207
27	10.2.60.208/29	10.2.60.209 – 10.2.60.214	10.2.60.215
28	10.2.60.216/29	10.2.60.217 – 10.2.60.222	10.2.60.223
29	10.2.60.224/29	10.2.60.225 – 10.2.60.230	10.2.60.231
30	10.2.60.232/29	10.2.60.233 – 10.2.60.238	10.2.60.239
31	10.2.60.240/29	10.2.60.241 – 10.2.60.246	10.2.60.247
32	10.2.60.248/29	10.2.60.249 – 10.2.60.254	10.2.60.255
33	10.2.61.0/29	10.2.61.1 – 10.2.61.6	10.2.61.7
34	10.2.61.8/29	10.2.61.9 – 10.2.61.14	10.2.61.15
35	10.2.61.16/29	10.2.61.17 – 10.2.61.22	10.2.61.23
36	10.2.61.24/29	10.2.61.25 – 10.2.61.30	10.2.61.31
37	10.2.61.32/29	10.2.61.33 – 10.2.61.38	10.2.61.39
38	10.2.61.40/29	10.2.61.41 – 10.2.61.46	10.2.61.47
39	10.2.61.48/29	10.2.61.49 – 10.2.61.54	10.2.61.55
40	10.2.61.56/29	10.2.61.57 – 10.2.61.62	10.2.61.63
41	10.2.61.64/29	10.2.61.65 – 10.2.61.70	10.2.61.71
42	10.2.61.72/29	10.2.61.73 – 10.2.61.78	10.2.61.79
43	10.2.61.80/29	10.2.61.81 – 10.2.61.86	10.2.61.87
44	10.2.61.88/29	10.2.61.89 – 10.2.61.94	10.2.61.95
45	10.2.61.96/29	10.2.61.97 – 10.2.61.102	10.2.61.103
46	10.2.61.104/29	10.2.61.105 – 10.2.61.110	10.2.61.111
47	10.2.61.112/29	10.2.61.113 – 10.2.61.118	10.2.61.119
48	10.2.61.120/29	10.2.61.121 – 10.2.61.126	10.2.61.127
49	10.2.61.128/29	10.2.61.129 – 10.2.61.134	10.2.61.135
50	10.2.61.136/29	10.2.61.137 – 10.2.61.142	10.2.61.143
51	10.2.61.144/29	10.2.61.145 – 10.2.61.150	10.2.61.151
52	10.2.61.152/29	10.2.61.153 – 10.2.61.158	10.2.61.159
53	10.2.61.160/29	10.2.61.161 – 10.2.61.166	10.2.61.167
54	10.2.61.168/29	10.2.61.169 – 10.2.61.174	10.2.61.175
55	10.2.61.176/29	10.2.61.177 – 10.2.61.182	10.2.61.183
56	10.2.61.184/29	10.2.61.185 – 10.2.61.190	10.2.61.191
57	10.2.61.192/29	10.2.61.193 – 10.2.61.198	10.2.61.199
58	10.2.61.200/29	10.2.61.201 – 10.2.61.206	10.2.61.207
59	10.2.61.208/29	10.2.61.209 – 10.2.61.214	10.2.61.215
60	10.2.61.216/29	10.2.61.217 – 10.2.61.222	10.2.61.223
61	10.2.61.224/29	10.2.61.225 – 10.2.61.230	10.2.61.231
62	10.2.61.232/29	10.2.61.233 – 10.2.61.238	10.2.61.239
63	10.2.61.240/29	10.2.61.241 – 10.2.61.246	10.2.61.247
64	10.2.61.248/29	10.2.61.249 – 10.2.61.254	10.2.61.255

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 →