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)10.2.192.0/19

network10.2.192.0/19

broadcast10.2.223.255

first host10.2.192.1

last host10.2.223.254

subnet mask255.255.224.0

wildcard0.0.31.255

addresses8,192

usable hosts8,190

classA

ipcalc 10.2.192.0/19

address00001010.00000010.11000000.00000000

subnet mask11111111.11111111.11100000.00000000

network00001010.00000010.11000000.00000000

broadcast00001010.00000010.11011111.11111111

green = network part, grey = host part

hex0x0a02c000

decimal167952384

reverse dns0.192.2.10.in-addr.arpa

ipv4-mapped::ffff:a02:c000

/19 split into /26 · 128 subnets

close ×

#	network	host range	broadcast
1	10.2.192.0/26	10.2.192.1 – 10.2.192.62	10.2.192.63
2	10.2.192.64/26	10.2.192.65 – 10.2.192.126	10.2.192.127
3	10.2.192.128/26	10.2.192.129 – 10.2.192.190	10.2.192.191
4	10.2.192.192/26	10.2.192.193 – 10.2.192.254	10.2.192.255
5	10.2.193.0/26	10.2.193.1 – 10.2.193.62	10.2.193.63
6	10.2.193.64/26	10.2.193.65 – 10.2.193.126	10.2.193.127
7	10.2.193.128/26	10.2.193.129 – 10.2.193.190	10.2.193.191
8	10.2.193.192/26	10.2.193.193 – 10.2.193.254	10.2.193.255
9	10.2.194.0/26	10.2.194.1 – 10.2.194.62	10.2.194.63
10	10.2.194.64/26	10.2.194.65 – 10.2.194.126	10.2.194.127
11	10.2.194.128/26	10.2.194.129 – 10.2.194.190	10.2.194.191
12	10.2.194.192/26	10.2.194.193 – 10.2.194.254	10.2.194.255
13	10.2.195.0/26	10.2.195.1 – 10.2.195.62	10.2.195.63
14	10.2.195.64/26	10.2.195.65 – 10.2.195.126	10.2.195.127
15	10.2.195.128/26	10.2.195.129 – 10.2.195.190	10.2.195.191
16	10.2.195.192/26	10.2.195.193 – 10.2.195.254	10.2.195.255
17	10.2.196.0/26	10.2.196.1 – 10.2.196.62	10.2.196.63
18	10.2.196.64/26	10.2.196.65 – 10.2.196.126	10.2.196.127
19	10.2.196.128/26	10.2.196.129 – 10.2.196.190	10.2.196.191
20	10.2.196.192/26	10.2.196.193 – 10.2.196.254	10.2.196.255
21	10.2.197.0/26	10.2.197.1 – 10.2.197.62	10.2.197.63
22	10.2.197.64/26	10.2.197.65 – 10.2.197.126	10.2.197.127
23	10.2.197.128/26	10.2.197.129 – 10.2.197.190	10.2.197.191
24	10.2.197.192/26	10.2.197.193 – 10.2.197.254	10.2.197.255
25	10.2.198.0/26	10.2.198.1 – 10.2.198.62	10.2.198.63
26	10.2.198.64/26	10.2.198.65 – 10.2.198.126	10.2.198.127
27	10.2.198.128/26	10.2.198.129 – 10.2.198.190	10.2.198.191
28	10.2.198.192/26	10.2.198.193 – 10.2.198.254	10.2.198.255
29	10.2.199.0/26	10.2.199.1 – 10.2.199.62	10.2.199.63
30	10.2.199.64/26	10.2.199.65 – 10.2.199.126	10.2.199.127
31	10.2.199.128/26	10.2.199.129 – 10.2.199.190	10.2.199.191
32	10.2.199.192/26	10.2.199.193 – 10.2.199.254	10.2.199.255
33	10.2.200.0/26	10.2.200.1 – 10.2.200.62	10.2.200.63
34	10.2.200.64/26	10.2.200.65 – 10.2.200.126	10.2.200.127
35	10.2.200.128/26	10.2.200.129 – 10.2.200.190	10.2.200.191
36	10.2.200.192/26	10.2.200.193 – 10.2.200.254	10.2.200.255
37	10.2.201.0/26	10.2.201.1 – 10.2.201.62	10.2.201.63
38	10.2.201.64/26	10.2.201.65 – 10.2.201.126	10.2.201.127
39	10.2.201.128/26	10.2.201.129 – 10.2.201.190	10.2.201.191
40	10.2.201.192/26	10.2.201.193 – 10.2.201.254	10.2.201.255
41	10.2.202.0/26	10.2.202.1 – 10.2.202.62	10.2.202.63
42	10.2.202.64/26	10.2.202.65 – 10.2.202.126	10.2.202.127
43	10.2.202.128/26	10.2.202.129 – 10.2.202.190	10.2.202.191
44	10.2.202.192/26	10.2.202.193 – 10.2.202.254	10.2.202.255
45	10.2.203.0/26	10.2.203.1 – 10.2.203.62	10.2.203.63
46	10.2.203.64/26	10.2.203.65 – 10.2.203.126	10.2.203.127
47	10.2.203.128/26	10.2.203.129 – 10.2.203.190	10.2.203.191
48	10.2.203.192/26	10.2.203.193 – 10.2.203.254	10.2.203.255
49	10.2.204.0/26	10.2.204.1 – 10.2.204.62	10.2.204.63
50	10.2.204.64/26	10.2.204.65 – 10.2.204.126	10.2.204.127
51	10.2.204.128/26	10.2.204.129 – 10.2.204.190	10.2.204.191
52	10.2.204.192/26	10.2.204.193 – 10.2.204.254	10.2.204.255
53	10.2.205.0/26	10.2.205.1 – 10.2.205.62	10.2.205.63
54	10.2.205.64/26	10.2.205.65 – 10.2.205.126	10.2.205.127
55	10.2.205.128/26	10.2.205.129 – 10.2.205.190	10.2.205.191
56	10.2.205.192/26	10.2.205.193 – 10.2.205.254	10.2.205.255
57	10.2.206.0/26	10.2.206.1 – 10.2.206.62	10.2.206.63
58	10.2.206.64/26	10.2.206.65 – 10.2.206.126	10.2.206.127
59	10.2.206.128/26	10.2.206.129 – 10.2.206.190	10.2.206.191
60	10.2.206.192/26	10.2.206.193 – 10.2.206.254	10.2.206.255
61	10.2.207.0/26	10.2.207.1 – 10.2.207.62	10.2.207.63
62	10.2.207.64/26	10.2.207.65 – 10.2.207.126	10.2.207.127
63	10.2.207.128/26	10.2.207.129 – 10.2.207.190	10.2.207.191
64	10.2.207.192/26	10.2.207.193 – 10.2.207.254	10.2.207.255
65	10.2.208.0/26	10.2.208.1 – 10.2.208.62	10.2.208.63
66	10.2.208.64/26	10.2.208.65 – 10.2.208.126	10.2.208.127
67	10.2.208.128/26	10.2.208.129 – 10.2.208.190	10.2.208.191
68	10.2.208.192/26	10.2.208.193 – 10.2.208.254	10.2.208.255
69	10.2.209.0/26	10.2.209.1 – 10.2.209.62	10.2.209.63
70	10.2.209.64/26	10.2.209.65 – 10.2.209.126	10.2.209.127
71	10.2.209.128/26	10.2.209.129 – 10.2.209.190	10.2.209.191
72	10.2.209.192/26	10.2.209.193 – 10.2.209.254	10.2.209.255
73	10.2.210.0/26	10.2.210.1 – 10.2.210.62	10.2.210.63
74	10.2.210.64/26	10.2.210.65 – 10.2.210.126	10.2.210.127
75	10.2.210.128/26	10.2.210.129 – 10.2.210.190	10.2.210.191
76	10.2.210.192/26	10.2.210.193 – 10.2.210.254	10.2.210.255
77	10.2.211.0/26	10.2.211.1 – 10.2.211.62	10.2.211.63
78	10.2.211.64/26	10.2.211.65 – 10.2.211.126	10.2.211.127
79	10.2.211.128/26	10.2.211.129 – 10.2.211.190	10.2.211.191
80	10.2.211.192/26	10.2.211.193 – 10.2.211.254	10.2.211.255
81	10.2.212.0/26	10.2.212.1 – 10.2.212.62	10.2.212.63
82	10.2.212.64/26	10.2.212.65 – 10.2.212.126	10.2.212.127
83	10.2.212.128/26	10.2.212.129 – 10.2.212.190	10.2.212.191
84	10.2.212.192/26	10.2.212.193 – 10.2.212.254	10.2.212.255
85	10.2.213.0/26	10.2.213.1 – 10.2.213.62	10.2.213.63
86	10.2.213.64/26	10.2.213.65 – 10.2.213.126	10.2.213.127
87	10.2.213.128/26	10.2.213.129 – 10.2.213.190	10.2.213.191
88	10.2.213.192/26	10.2.213.193 – 10.2.213.254	10.2.213.255
89	10.2.214.0/26	10.2.214.1 – 10.2.214.62	10.2.214.63
90	10.2.214.64/26	10.2.214.65 – 10.2.214.126	10.2.214.127
91	10.2.214.128/26	10.2.214.129 – 10.2.214.190	10.2.214.191
92	10.2.214.192/26	10.2.214.193 – 10.2.214.254	10.2.214.255
93	10.2.215.0/26	10.2.215.1 – 10.2.215.62	10.2.215.63
94	10.2.215.64/26	10.2.215.65 – 10.2.215.126	10.2.215.127
95	10.2.215.128/26	10.2.215.129 – 10.2.215.190	10.2.215.191
96	10.2.215.192/26	10.2.215.193 – 10.2.215.254	10.2.215.255
97	10.2.216.0/26	10.2.216.1 – 10.2.216.62	10.2.216.63
98	10.2.216.64/26	10.2.216.65 – 10.2.216.126	10.2.216.127
99	10.2.216.128/26	10.2.216.129 – 10.2.216.190	10.2.216.191
100	10.2.216.192/26	10.2.216.193 – 10.2.216.254	10.2.216.255
101	10.2.217.0/26	10.2.217.1 – 10.2.217.62	10.2.217.63
102	10.2.217.64/26	10.2.217.65 – 10.2.217.126	10.2.217.127
103	10.2.217.128/26	10.2.217.129 – 10.2.217.190	10.2.217.191
104	10.2.217.192/26	10.2.217.193 – 10.2.217.254	10.2.217.255
105	10.2.218.0/26	10.2.218.1 – 10.2.218.62	10.2.218.63
106	10.2.218.64/26	10.2.218.65 – 10.2.218.126	10.2.218.127
107	10.2.218.128/26	10.2.218.129 – 10.2.218.190	10.2.218.191
108	10.2.218.192/26	10.2.218.193 – 10.2.218.254	10.2.218.255
109	10.2.219.0/26	10.2.219.1 – 10.2.219.62	10.2.219.63
110	10.2.219.64/26	10.2.219.65 – 10.2.219.126	10.2.219.127
111	10.2.219.128/26	10.2.219.129 – 10.2.219.190	10.2.219.191
112	10.2.219.192/26	10.2.219.193 – 10.2.219.254	10.2.219.255
113	10.2.220.0/26	10.2.220.1 – 10.2.220.62	10.2.220.63
114	10.2.220.64/26	10.2.220.65 – 10.2.220.126	10.2.220.127
115	10.2.220.128/26	10.2.220.129 – 10.2.220.190	10.2.220.191
116	10.2.220.192/26	10.2.220.193 – 10.2.220.254	10.2.220.255
117	10.2.221.0/26	10.2.221.1 – 10.2.221.62	10.2.221.63
118	10.2.221.64/26	10.2.221.65 – 10.2.221.126	10.2.221.127
119	10.2.221.128/26	10.2.221.129 – 10.2.221.190	10.2.221.191
120	10.2.221.192/26	10.2.221.193 – 10.2.221.254	10.2.221.255
121	10.2.222.0/26	10.2.222.1 – 10.2.222.62	10.2.222.63
122	10.2.222.64/26	10.2.222.65 – 10.2.222.126	10.2.222.127
123	10.2.222.128/26	10.2.222.129 – 10.2.222.190	10.2.222.191
124	10.2.222.192/26	10.2.222.193 – 10.2.222.254	10.2.222.255
125	10.2.223.0/26	10.2.223.1 – 10.2.223.62	10.2.223.63
126	10.2.223.64/26	10.2.223.65 – 10.2.223.126	10.2.223.127
127	10.2.223.128/26	10.2.223.129 – 10.2.223.190	10.2.223.191
128	10.2.223.192/26	10.2.223.193 – 10.2.223.254	10.2.223.255

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 /19
/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	1
/20	255.255.240.0	4,096	4,094	2 split →
/21	255.255.248.0	2,048	2,046	4 split →
/22	255.255.252.0	1,024	1,022	8 split →
/23	255.255.254.0	512	510	16 split →
/24	255.255.255.0	256	254	32 split →
/25	255.255.255.128	128	126	64 split →
/26	255.255.255.192	64	62	128 split →
/27	255.255.255.224	32	30	256 split →
/28	255.255.255.240	16	14	512 split →
/29	255.255.255.248	8	6	1,024 split →
/30	255.255.255.252	4	2	2,048 split →
/31	255.255.255.254	2	2	4,096 split →
/32	255.255.255.255	1	1	8,192 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 →