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)10.16.0.0/19

network10.16.0.0/19

broadcast10.16.31.255

first host10.16.0.1

last host10.16.31.254

subnet mask255.255.224.0

wildcard0.0.31.255

addresses8,192

usable hosts8,190

classA

ipcalc 10.16.0.0/19

address00001010.00010000.00000000.00000000

subnet mask11111111.11111111.11100000.00000000

network00001010.00010000.00000000.00000000

broadcast00001010.00010000.00011111.11111111

green = network part, grey = host part

hex0x0a100000

decimal168820736

reverse dns0.0.16.10.in-addr.arpa

ipv4-mapped::ffff:a10:0

/19 split into /26 · 128 subnets

close ×

#	network	host range	broadcast
1	10.16.0.0/26	10.16.0.1 – 10.16.0.62	10.16.0.63
2	10.16.0.64/26	10.16.0.65 – 10.16.0.126	10.16.0.127
3	10.16.0.128/26	10.16.0.129 – 10.16.0.190	10.16.0.191
4	10.16.0.192/26	10.16.0.193 – 10.16.0.254	10.16.0.255
5	10.16.1.0/26	10.16.1.1 – 10.16.1.62	10.16.1.63
6	10.16.1.64/26	10.16.1.65 – 10.16.1.126	10.16.1.127
7	10.16.1.128/26	10.16.1.129 – 10.16.1.190	10.16.1.191
8	10.16.1.192/26	10.16.1.193 – 10.16.1.254	10.16.1.255
9	10.16.2.0/26	10.16.2.1 – 10.16.2.62	10.16.2.63
10	10.16.2.64/26	10.16.2.65 – 10.16.2.126	10.16.2.127
11	10.16.2.128/26	10.16.2.129 – 10.16.2.190	10.16.2.191
12	10.16.2.192/26	10.16.2.193 – 10.16.2.254	10.16.2.255
13	10.16.3.0/26	10.16.3.1 – 10.16.3.62	10.16.3.63
14	10.16.3.64/26	10.16.3.65 – 10.16.3.126	10.16.3.127
15	10.16.3.128/26	10.16.3.129 – 10.16.3.190	10.16.3.191
16	10.16.3.192/26	10.16.3.193 – 10.16.3.254	10.16.3.255
17	10.16.4.0/26	10.16.4.1 – 10.16.4.62	10.16.4.63
18	10.16.4.64/26	10.16.4.65 – 10.16.4.126	10.16.4.127
19	10.16.4.128/26	10.16.4.129 – 10.16.4.190	10.16.4.191
20	10.16.4.192/26	10.16.4.193 – 10.16.4.254	10.16.4.255
21	10.16.5.0/26	10.16.5.1 – 10.16.5.62	10.16.5.63
22	10.16.5.64/26	10.16.5.65 – 10.16.5.126	10.16.5.127
23	10.16.5.128/26	10.16.5.129 – 10.16.5.190	10.16.5.191
24	10.16.5.192/26	10.16.5.193 – 10.16.5.254	10.16.5.255
25	10.16.6.0/26	10.16.6.1 – 10.16.6.62	10.16.6.63
26	10.16.6.64/26	10.16.6.65 – 10.16.6.126	10.16.6.127
27	10.16.6.128/26	10.16.6.129 – 10.16.6.190	10.16.6.191
28	10.16.6.192/26	10.16.6.193 – 10.16.6.254	10.16.6.255
29	10.16.7.0/26	10.16.7.1 – 10.16.7.62	10.16.7.63
30	10.16.7.64/26	10.16.7.65 – 10.16.7.126	10.16.7.127
31	10.16.7.128/26	10.16.7.129 – 10.16.7.190	10.16.7.191
32	10.16.7.192/26	10.16.7.193 – 10.16.7.254	10.16.7.255
33	10.16.8.0/26	10.16.8.1 – 10.16.8.62	10.16.8.63
34	10.16.8.64/26	10.16.8.65 – 10.16.8.126	10.16.8.127
35	10.16.8.128/26	10.16.8.129 – 10.16.8.190	10.16.8.191
36	10.16.8.192/26	10.16.8.193 – 10.16.8.254	10.16.8.255
37	10.16.9.0/26	10.16.9.1 – 10.16.9.62	10.16.9.63
38	10.16.9.64/26	10.16.9.65 – 10.16.9.126	10.16.9.127
39	10.16.9.128/26	10.16.9.129 – 10.16.9.190	10.16.9.191
40	10.16.9.192/26	10.16.9.193 – 10.16.9.254	10.16.9.255
41	10.16.10.0/26	10.16.10.1 – 10.16.10.62	10.16.10.63
42	10.16.10.64/26	10.16.10.65 – 10.16.10.126	10.16.10.127
43	10.16.10.128/26	10.16.10.129 – 10.16.10.190	10.16.10.191
44	10.16.10.192/26	10.16.10.193 – 10.16.10.254	10.16.10.255
45	10.16.11.0/26	10.16.11.1 – 10.16.11.62	10.16.11.63
46	10.16.11.64/26	10.16.11.65 – 10.16.11.126	10.16.11.127
47	10.16.11.128/26	10.16.11.129 – 10.16.11.190	10.16.11.191
48	10.16.11.192/26	10.16.11.193 – 10.16.11.254	10.16.11.255
49	10.16.12.0/26	10.16.12.1 – 10.16.12.62	10.16.12.63
50	10.16.12.64/26	10.16.12.65 – 10.16.12.126	10.16.12.127
51	10.16.12.128/26	10.16.12.129 – 10.16.12.190	10.16.12.191
52	10.16.12.192/26	10.16.12.193 – 10.16.12.254	10.16.12.255
53	10.16.13.0/26	10.16.13.1 – 10.16.13.62	10.16.13.63
54	10.16.13.64/26	10.16.13.65 – 10.16.13.126	10.16.13.127
55	10.16.13.128/26	10.16.13.129 – 10.16.13.190	10.16.13.191
56	10.16.13.192/26	10.16.13.193 – 10.16.13.254	10.16.13.255
57	10.16.14.0/26	10.16.14.1 – 10.16.14.62	10.16.14.63
58	10.16.14.64/26	10.16.14.65 – 10.16.14.126	10.16.14.127
59	10.16.14.128/26	10.16.14.129 – 10.16.14.190	10.16.14.191
60	10.16.14.192/26	10.16.14.193 – 10.16.14.254	10.16.14.255
61	10.16.15.0/26	10.16.15.1 – 10.16.15.62	10.16.15.63
62	10.16.15.64/26	10.16.15.65 – 10.16.15.126	10.16.15.127
63	10.16.15.128/26	10.16.15.129 – 10.16.15.190	10.16.15.191
64	10.16.15.192/26	10.16.15.193 – 10.16.15.254	10.16.15.255
65	10.16.16.0/26	10.16.16.1 – 10.16.16.62	10.16.16.63
66	10.16.16.64/26	10.16.16.65 – 10.16.16.126	10.16.16.127
67	10.16.16.128/26	10.16.16.129 – 10.16.16.190	10.16.16.191
68	10.16.16.192/26	10.16.16.193 – 10.16.16.254	10.16.16.255
69	10.16.17.0/26	10.16.17.1 – 10.16.17.62	10.16.17.63
70	10.16.17.64/26	10.16.17.65 – 10.16.17.126	10.16.17.127
71	10.16.17.128/26	10.16.17.129 – 10.16.17.190	10.16.17.191
72	10.16.17.192/26	10.16.17.193 – 10.16.17.254	10.16.17.255
73	10.16.18.0/26	10.16.18.1 – 10.16.18.62	10.16.18.63
74	10.16.18.64/26	10.16.18.65 – 10.16.18.126	10.16.18.127
75	10.16.18.128/26	10.16.18.129 – 10.16.18.190	10.16.18.191
76	10.16.18.192/26	10.16.18.193 – 10.16.18.254	10.16.18.255
77	10.16.19.0/26	10.16.19.1 – 10.16.19.62	10.16.19.63
78	10.16.19.64/26	10.16.19.65 – 10.16.19.126	10.16.19.127
79	10.16.19.128/26	10.16.19.129 – 10.16.19.190	10.16.19.191
80	10.16.19.192/26	10.16.19.193 – 10.16.19.254	10.16.19.255
81	10.16.20.0/26	10.16.20.1 – 10.16.20.62	10.16.20.63
82	10.16.20.64/26	10.16.20.65 – 10.16.20.126	10.16.20.127
83	10.16.20.128/26	10.16.20.129 – 10.16.20.190	10.16.20.191
84	10.16.20.192/26	10.16.20.193 – 10.16.20.254	10.16.20.255
85	10.16.21.0/26	10.16.21.1 – 10.16.21.62	10.16.21.63
86	10.16.21.64/26	10.16.21.65 – 10.16.21.126	10.16.21.127
87	10.16.21.128/26	10.16.21.129 – 10.16.21.190	10.16.21.191
88	10.16.21.192/26	10.16.21.193 – 10.16.21.254	10.16.21.255
89	10.16.22.0/26	10.16.22.1 – 10.16.22.62	10.16.22.63
90	10.16.22.64/26	10.16.22.65 – 10.16.22.126	10.16.22.127
91	10.16.22.128/26	10.16.22.129 – 10.16.22.190	10.16.22.191
92	10.16.22.192/26	10.16.22.193 – 10.16.22.254	10.16.22.255
93	10.16.23.0/26	10.16.23.1 – 10.16.23.62	10.16.23.63
94	10.16.23.64/26	10.16.23.65 – 10.16.23.126	10.16.23.127
95	10.16.23.128/26	10.16.23.129 – 10.16.23.190	10.16.23.191
96	10.16.23.192/26	10.16.23.193 – 10.16.23.254	10.16.23.255
97	10.16.24.0/26	10.16.24.1 – 10.16.24.62	10.16.24.63
98	10.16.24.64/26	10.16.24.65 – 10.16.24.126	10.16.24.127
99	10.16.24.128/26	10.16.24.129 – 10.16.24.190	10.16.24.191
100	10.16.24.192/26	10.16.24.193 – 10.16.24.254	10.16.24.255
101	10.16.25.0/26	10.16.25.1 – 10.16.25.62	10.16.25.63
102	10.16.25.64/26	10.16.25.65 – 10.16.25.126	10.16.25.127
103	10.16.25.128/26	10.16.25.129 – 10.16.25.190	10.16.25.191
104	10.16.25.192/26	10.16.25.193 – 10.16.25.254	10.16.25.255
105	10.16.26.0/26	10.16.26.1 – 10.16.26.62	10.16.26.63
106	10.16.26.64/26	10.16.26.65 – 10.16.26.126	10.16.26.127
107	10.16.26.128/26	10.16.26.129 – 10.16.26.190	10.16.26.191
108	10.16.26.192/26	10.16.26.193 – 10.16.26.254	10.16.26.255
109	10.16.27.0/26	10.16.27.1 – 10.16.27.62	10.16.27.63
110	10.16.27.64/26	10.16.27.65 – 10.16.27.126	10.16.27.127
111	10.16.27.128/26	10.16.27.129 – 10.16.27.190	10.16.27.191
112	10.16.27.192/26	10.16.27.193 – 10.16.27.254	10.16.27.255
113	10.16.28.0/26	10.16.28.1 – 10.16.28.62	10.16.28.63
114	10.16.28.64/26	10.16.28.65 – 10.16.28.126	10.16.28.127
115	10.16.28.128/26	10.16.28.129 – 10.16.28.190	10.16.28.191
116	10.16.28.192/26	10.16.28.193 – 10.16.28.254	10.16.28.255
117	10.16.29.0/26	10.16.29.1 – 10.16.29.62	10.16.29.63
118	10.16.29.64/26	10.16.29.65 – 10.16.29.126	10.16.29.127
119	10.16.29.128/26	10.16.29.129 – 10.16.29.190	10.16.29.191
120	10.16.29.192/26	10.16.29.193 – 10.16.29.254	10.16.29.255
121	10.16.30.0/26	10.16.30.1 – 10.16.30.62	10.16.30.63
122	10.16.30.64/26	10.16.30.65 – 10.16.30.126	10.16.30.127
123	10.16.30.128/26	10.16.30.129 – 10.16.30.190	10.16.30.191
124	10.16.30.192/26	10.16.30.193 – 10.16.30.254	10.16.30.255
125	10.16.31.0/26	10.16.31.1 – 10.16.31.62	10.16.31.63
126	10.16.31.64/26	10.16.31.65 – 10.16.31.126	10.16.31.127
127	10.16.31.128/26	10.16.31.129 – 10.16.31.190	10.16.31.191
128	10.16.31.192/26	10.16.31.193 – 10.16.31.254	10.16.31.255

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 →