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)10.4.144.0/20

network10.4.144.0/20

broadcast10.4.159.255

first host10.4.144.1

last host10.4.159.254

subnet mask255.255.240.0

wildcard0.0.15.255

addresses4,096

usable hosts4,094

classA

ipcalc 10.4.144.0/20

address00001010.00000100.10010000.00000000

subnet mask11111111.11111111.11110000.00000000

network00001010.00000100.10010000.00000000

broadcast00001010.00000100.10011111.11111111

green = network part, grey = host part

hex0x0a049000

decimal168071168

reverse dns0.144.4.10.in-addr.arpa

ipv4-mapped::ffff:a04:9000

/20 split into /27 · 128 subnets

close ×

#	network	host range	broadcast
1	10.4.144.0/27	10.4.144.1 – 10.4.144.30	10.4.144.31
2	10.4.144.32/27	10.4.144.33 – 10.4.144.62	10.4.144.63
3	10.4.144.64/27	10.4.144.65 – 10.4.144.94	10.4.144.95
4	10.4.144.96/27	10.4.144.97 – 10.4.144.126	10.4.144.127
5	10.4.144.128/27	10.4.144.129 – 10.4.144.158	10.4.144.159
6	10.4.144.160/27	10.4.144.161 – 10.4.144.190	10.4.144.191
7	10.4.144.192/27	10.4.144.193 – 10.4.144.222	10.4.144.223
8	10.4.144.224/27	10.4.144.225 – 10.4.144.254	10.4.144.255
9	10.4.145.0/27	10.4.145.1 – 10.4.145.30	10.4.145.31
10	10.4.145.32/27	10.4.145.33 – 10.4.145.62	10.4.145.63
11	10.4.145.64/27	10.4.145.65 – 10.4.145.94	10.4.145.95
12	10.4.145.96/27	10.4.145.97 – 10.4.145.126	10.4.145.127
13	10.4.145.128/27	10.4.145.129 – 10.4.145.158	10.4.145.159
14	10.4.145.160/27	10.4.145.161 – 10.4.145.190	10.4.145.191
15	10.4.145.192/27	10.4.145.193 – 10.4.145.222	10.4.145.223
16	10.4.145.224/27	10.4.145.225 – 10.4.145.254	10.4.145.255
17	10.4.146.0/27	10.4.146.1 – 10.4.146.30	10.4.146.31
18	10.4.146.32/27	10.4.146.33 – 10.4.146.62	10.4.146.63
19	10.4.146.64/27	10.4.146.65 – 10.4.146.94	10.4.146.95
20	10.4.146.96/27	10.4.146.97 – 10.4.146.126	10.4.146.127
21	10.4.146.128/27	10.4.146.129 – 10.4.146.158	10.4.146.159
22	10.4.146.160/27	10.4.146.161 – 10.4.146.190	10.4.146.191
23	10.4.146.192/27	10.4.146.193 – 10.4.146.222	10.4.146.223
24	10.4.146.224/27	10.4.146.225 – 10.4.146.254	10.4.146.255
25	10.4.147.0/27	10.4.147.1 – 10.4.147.30	10.4.147.31
26	10.4.147.32/27	10.4.147.33 – 10.4.147.62	10.4.147.63
27	10.4.147.64/27	10.4.147.65 – 10.4.147.94	10.4.147.95
28	10.4.147.96/27	10.4.147.97 – 10.4.147.126	10.4.147.127
29	10.4.147.128/27	10.4.147.129 – 10.4.147.158	10.4.147.159
30	10.4.147.160/27	10.4.147.161 – 10.4.147.190	10.4.147.191
31	10.4.147.192/27	10.4.147.193 – 10.4.147.222	10.4.147.223
32	10.4.147.224/27	10.4.147.225 – 10.4.147.254	10.4.147.255
33	10.4.148.0/27	10.4.148.1 – 10.4.148.30	10.4.148.31
34	10.4.148.32/27	10.4.148.33 – 10.4.148.62	10.4.148.63
35	10.4.148.64/27	10.4.148.65 – 10.4.148.94	10.4.148.95
36	10.4.148.96/27	10.4.148.97 – 10.4.148.126	10.4.148.127
37	10.4.148.128/27	10.4.148.129 – 10.4.148.158	10.4.148.159
38	10.4.148.160/27	10.4.148.161 – 10.4.148.190	10.4.148.191
39	10.4.148.192/27	10.4.148.193 – 10.4.148.222	10.4.148.223
40	10.4.148.224/27	10.4.148.225 – 10.4.148.254	10.4.148.255
41	10.4.149.0/27	10.4.149.1 – 10.4.149.30	10.4.149.31
42	10.4.149.32/27	10.4.149.33 – 10.4.149.62	10.4.149.63
43	10.4.149.64/27	10.4.149.65 – 10.4.149.94	10.4.149.95
44	10.4.149.96/27	10.4.149.97 – 10.4.149.126	10.4.149.127
45	10.4.149.128/27	10.4.149.129 – 10.4.149.158	10.4.149.159
46	10.4.149.160/27	10.4.149.161 – 10.4.149.190	10.4.149.191
47	10.4.149.192/27	10.4.149.193 – 10.4.149.222	10.4.149.223
48	10.4.149.224/27	10.4.149.225 – 10.4.149.254	10.4.149.255
49	10.4.150.0/27	10.4.150.1 – 10.4.150.30	10.4.150.31
50	10.4.150.32/27	10.4.150.33 – 10.4.150.62	10.4.150.63
51	10.4.150.64/27	10.4.150.65 – 10.4.150.94	10.4.150.95
52	10.4.150.96/27	10.4.150.97 – 10.4.150.126	10.4.150.127
53	10.4.150.128/27	10.4.150.129 – 10.4.150.158	10.4.150.159
54	10.4.150.160/27	10.4.150.161 – 10.4.150.190	10.4.150.191
55	10.4.150.192/27	10.4.150.193 – 10.4.150.222	10.4.150.223
56	10.4.150.224/27	10.4.150.225 – 10.4.150.254	10.4.150.255
57	10.4.151.0/27	10.4.151.1 – 10.4.151.30	10.4.151.31
58	10.4.151.32/27	10.4.151.33 – 10.4.151.62	10.4.151.63
59	10.4.151.64/27	10.4.151.65 – 10.4.151.94	10.4.151.95
60	10.4.151.96/27	10.4.151.97 – 10.4.151.126	10.4.151.127
61	10.4.151.128/27	10.4.151.129 – 10.4.151.158	10.4.151.159
62	10.4.151.160/27	10.4.151.161 – 10.4.151.190	10.4.151.191
63	10.4.151.192/27	10.4.151.193 – 10.4.151.222	10.4.151.223
64	10.4.151.224/27	10.4.151.225 – 10.4.151.254	10.4.151.255
65	10.4.152.0/27	10.4.152.1 – 10.4.152.30	10.4.152.31
66	10.4.152.32/27	10.4.152.33 – 10.4.152.62	10.4.152.63
67	10.4.152.64/27	10.4.152.65 – 10.4.152.94	10.4.152.95
68	10.4.152.96/27	10.4.152.97 – 10.4.152.126	10.4.152.127
69	10.4.152.128/27	10.4.152.129 – 10.4.152.158	10.4.152.159
70	10.4.152.160/27	10.4.152.161 – 10.4.152.190	10.4.152.191
71	10.4.152.192/27	10.4.152.193 – 10.4.152.222	10.4.152.223
72	10.4.152.224/27	10.4.152.225 – 10.4.152.254	10.4.152.255
73	10.4.153.0/27	10.4.153.1 – 10.4.153.30	10.4.153.31
74	10.4.153.32/27	10.4.153.33 – 10.4.153.62	10.4.153.63
75	10.4.153.64/27	10.4.153.65 – 10.4.153.94	10.4.153.95
76	10.4.153.96/27	10.4.153.97 – 10.4.153.126	10.4.153.127
77	10.4.153.128/27	10.4.153.129 – 10.4.153.158	10.4.153.159
78	10.4.153.160/27	10.4.153.161 – 10.4.153.190	10.4.153.191
79	10.4.153.192/27	10.4.153.193 – 10.4.153.222	10.4.153.223
80	10.4.153.224/27	10.4.153.225 – 10.4.153.254	10.4.153.255
81	10.4.154.0/27	10.4.154.1 – 10.4.154.30	10.4.154.31
82	10.4.154.32/27	10.4.154.33 – 10.4.154.62	10.4.154.63
83	10.4.154.64/27	10.4.154.65 – 10.4.154.94	10.4.154.95
84	10.4.154.96/27	10.4.154.97 – 10.4.154.126	10.4.154.127
85	10.4.154.128/27	10.4.154.129 – 10.4.154.158	10.4.154.159
86	10.4.154.160/27	10.4.154.161 – 10.4.154.190	10.4.154.191
87	10.4.154.192/27	10.4.154.193 – 10.4.154.222	10.4.154.223
88	10.4.154.224/27	10.4.154.225 – 10.4.154.254	10.4.154.255
89	10.4.155.0/27	10.4.155.1 – 10.4.155.30	10.4.155.31
90	10.4.155.32/27	10.4.155.33 – 10.4.155.62	10.4.155.63
91	10.4.155.64/27	10.4.155.65 – 10.4.155.94	10.4.155.95
92	10.4.155.96/27	10.4.155.97 – 10.4.155.126	10.4.155.127
93	10.4.155.128/27	10.4.155.129 – 10.4.155.158	10.4.155.159
94	10.4.155.160/27	10.4.155.161 – 10.4.155.190	10.4.155.191
95	10.4.155.192/27	10.4.155.193 – 10.4.155.222	10.4.155.223
96	10.4.155.224/27	10.4.155.225 – 10.4.155.254	10.4.155.255
97	10.4.156.0/27	10.4.156.1 – 10.4.156.30	10.4.156.31
98	10.4.156.32/27	10.4.156.33 – 10.4.156.62	10.4.156.63
99	10.4.156.64/27	10.4.156.65 – 10.4.156.94	10.4.156.95
100	10.4.156.96/27	10.4.156.97 – 10.4.156.126	10.4.156.127
101	10.4.156.128/27	10.4.156.129 – 10.4.156.158	10.4.156.159
102	10.4.156.160/27	10.4.156.161 – 10.4.156.190	10.4.156.191
103	10.4.156.192/27	10.4.156.193 – 10.4.156.222	10.4.156.223
104	10.4.156.224/27	10.4.156.225 – 10.4.156.254	10.4.156.255
105	10.4.157.0/27	10.4.157.1 – 10.4.157.30	10.4.157.31
106	10.4.157.32/27	10.4.157.33 – 10.4.157.62	10.4.157.63
107	10.4.157.64/27	10.4.157.65 – 10.4.157.94	10.4.157.95
108	10.4.157.96/27	10.4.157.97 – 10.4.157.126	10.4.157.127
109	10.4.157.128/27	10.4.157.129 – 10.4.157.158	10.4.157.159
110	10.4.157.160/27	10.4.157.161 – 10.4.157.190	10.4.157.191
111	10.4.157.192/27	10.4.157.193 – 10.4.157.222	10.4.157.223
112	10.4.157.224/27	10.4.157.225 – 10.4.157.254	10.4.157.255
113	10.4.158.0/27	10.4.158.1 – 10.4.158.30	10.4.158.31
114	10.4.158.32/27	10.4.158.33 – 10.4.158.62	10.4.158.63
115	10.4.158.64/27	10.4.158.65 – 10.4.158.94	10.4.158.95
116	10.4.158.96/27	10.4.158.97 – 10.4.158.126	10.4.158.127
117	10.4.158.128/27	10.4.158.129 – 10.4.158.158	10.4.158.159
118	10.4.158.160/27	10.4.158.161 – 10.4.158.190	10.4.158.191
119	10.4.158.192/27	10.4.158.193 – 10.4.158.222	10.4.158.223
120	10.4.158.224/27	10.4.158.225 – 10.4.158.254	10.4.158.255
121	10.4.159.0/27	10.4.159.1 – 10.4.159.30	10.4.159.31
122	10.4.159.32/27	10.4.159.33 – 10.4.159.62	10.4.159.63
123	10.4.159.64/27	10.4.159.65 – 10.4.159.94	10.4.159.95
124	10.4.159.96/27	10.4.159.97 – 10.4.159.126	10.4.159.127
125	10.4.159.128/27	10.4.159.129 – 10.4.159.158	10.4.159.159
126	10.4.159.160/27	10.4.159.161 – 10.4.159.190	10.4.159.191
127	10.4.159.192/27	10.4.159.193 – 10.4.159.222	10.4.159.223
128	10.4.159.224/27	10.4.159.225 – 10.4.159.254	10.4.159.255

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