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)10.0.55.0/25

network10.0.55.0/25

broadcast10.0.55.127

first host10.0.55.1

last host10.0.55.126

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.0.55.0/25

address00001010.00000000.00110111.00000000

subnet mask11111111.11111111.11111111.10000000

network00001010.00000000.00110111.00000000

broadcast00001010.00000000.00110111.01111111

green = network part, grey = host part

hex0x0a003700

decimal167786240

reverse dns0.55.0.10.in-addr.arpa

ipv4-mapped::ffff:a00:3700

/25 split into /32 · 128 subnets

close ×

#	network	host range	broadcast
1	10.0.55.0/32	10.0.55.0 – 10.0.55.0	10.0.55.0
2	10.0.55.1/32	10.0.55.1 – 10.0.55.1	10.0.55.1
3	10.0.55.2/32	10.0.55.2 – 10.0.55.2	10.0.55.2
4	10.0.55.3/32	10.0.55.3 – 10.0.55.3	10.0.55.3
5	10.0.55.4/32	10.0.55.4 – 10.0.55.4	10.0.55.4
6	10.0.55.5/32	10.0.55.5 – 10.0.55.5	10.0.55.5
7	10.0.55.6/32	10.0.55.6 – 10.0.55.6	10.0.55.6
8	10.0.55.7/32	10.0.55.7 – 10.0.55.7	10.0.55.7
9	10.0.55.8/32	10.0.55.8 – 10.0.55.8	10.0.55.8
10	10.0.55.9/32	10.0.55.9 – 10.0.55.9	10.0.55.9
11	10.0.55.10/32	10.0.55.10 – 10.0.55.10	10.0.55.10
12	10.0.55.11/32	10.0.55.11 – 10.0.55.11	10.0.55.11
13	10.0.55.12/32	10.0.55.12 – 10.0.55.12	10.0.55.12
14	10.0.55.13/32	10.0.55.13 – 10.0.55.13	10.0.55.13
15	10.0.55.14/32	10.0.55.14 – 10.0.55.14	10.0.55.14
16	10.0.55.15/32	10.0.55.15 – 10.0.55.15	10.0.55.15
17	10.0.55.16/32	10.0.55.16 – 10.0.55.16	10.0.55.16
18	10.0.55.17/32	10.0.55.17 – 10.0.55.17	10.0.55.17
19	10.0.55.18/32	10.0.55.18 – 10.0.55.18	10.0.55.18
20	10.0.55.19/32	10.0.55.19 – 10.0.55.19	10.0.55.19
21	10.0.55.20/32	10.0.55.20 – 10.0.55.20	10.0.55.20
22	10.0.55.21/32	10.0.55.21 – 10.0.55.21	10.0.55.21
23	10.0.55.22/32	10.0.55.22 – 10.0.55.22	10.0.55.22
24	10.0.55.23/32	10.0.55.23 – 10.0.55.23	10.0.55.23
25	10.0.55.24/32	10.0.55.24 – 10.0.55.24	10.0.55.24
26	10.0.55.25/32	10.0.55.25 – 10.0.55.25	10.0.55.25
27	10.0.55.26/32	10.0.55.26 – 10.0.55.26	10.0.55.26
28	10.0.55.27/32	10.0.55.27 – 10.0.55.27	10.0.55.27
29	10.0.55.28/32	10.0.55.28 – 10.0.55.28	10.0.55.28
30	10.0.55.29/32	10.0.55.29 – 10.0.55.29	10.0.55.29
31	10.0.55.30/32	10.0.55.30 – 10.0.55.30	10.0.55.30
32	10.0.55.31/32	10.0.55.31 – 10.0.55.31	10.0.55.31
33	10.0.55.32/32	10.0.55.32 – 10.0.55.32	10.0.55.32
34	10.0.55.33/32	10.0.55.33 – 10.0.55.33	10.0.55.33
35	10.0.55.34/32	10.0.55.34 – 10.0.55.34	10.0.55.34
36	10.0.55.35/32	10.0.55.35 – 10.0.55.35	10.0.55.35
37	10.0.55.36/32	10.0.55.36 – 10.0.55.36	10.0.55.36
38	10.0.55.37/32	10.0.55.37 – 10.0.55.37	10.0.55.37
39	10.0.55.38/32	10.0.55.38 – 10.0.55.38	10.0.55.38
40	10.0.55.39/32	10.0.55.39 – 10.0.55.39	10.0.55.39
41	10.0.55.40/32	10.0.55.40 – 10.0.55.40	10.0.55.40
42	10.0.55.41/32	10.0.55.41 – 10.0.55.41	10.0.55.41
43	10.0.55.42/32	10.0.55.42 – 10.0.55.42	10.0.55.42
44	10.0.55.43/32	10.0.55.43 – 10.0.55.43	10.0.55.43
45	10.0.55.44/32	10.0.55.44 – 10.0.55.44	10.0.55.44
46	10.0.55.45/32	10.0.55.45 – 10.0.55.45	10.0.55.45
47	10.0.55.46/32	10.0.55.46 – 10.0.55.46	10.0.55.46
48	10.0.55.47/32	10.0.55.47 – 10.0.55.47	10.0.55.47
49	10.0.55.48/32	10.0.55.48 – 10.0.55.48	10.0.55.48
50	10.0.55.49/32	10.0.55.49 – 10.0.55.49	10.0.55.49
51	10.0.55.50/32	10.0.55.50 – 10.0.55.50	10.0.55.50
52	10.0.55.51/32	10.0.55.51 – 10.0.55.51	10.0.55.51
53	10.0.55.52/32	10.0.55.52 – 10.0.55.52	10.0.55.52
54	10.0.55.53/32	10.0.55.53 – 10.0.55.53	10.0.55.53
55	10.0.55.54/32	10.0.55.54 – 10.0.55.54	10.0.55.54
56	10.0.55.55/32	10.0.55.55 – 10.0.55.55	10.0.55.55
57	10.0.55.56/32	10.0.55.56 – 10.0.55.56	10.0.55.56
58	10.0.55.57/32	10.0.55.57 – 10.0.55.57	10.0.55.57
59	10.0.55.58/32	10.0.55.58 – 10.0.55.58	10.0.55.58
60	10.0.55.59/32	10.0.55.59 – 10.0.55.59	10.0.55.59
61	10.0.55.60/32	10.0.55.60 – 10.0.55.60	10.0.55.60
62	10.0.55.61/32	10.0.55.61 – 10.0.55.61	10.0.55.61
63	10.0.55.62/32	10.0.55.62 – 10.0.55.62	10.0.55.62
64	10.0.55.63/32	10.0.55.63 – 10.0.55.63	10.0.55.63
65	10.0.55.64/32	10.0.55.64 – 10.0.55.64	10.0.55.64
66	10.0.55.65/32	10.0.55.65 – 10.0.55.65	10.0.55.65
67	10.0.55.66/32	10.0.55.66 – 10.0.55.66	10.0.55.66
68	10.0.55.67/32	10.0.55.67 – 10.0.55.67	10.0.55.67
69	10.0.55.68/32	10.0.55.68 – 10.0.55.68	10.0.55.68
70	10.0.55.69/32	10.0.55.69 – 10.0.55.69	10.0.55.69
71	10.0.55.70/32	10.0.55.70 – 10.0.55.70	10.0.55.70
72	10.0.55.71/32	10.0.55.71 – 10.0.55.71	10.0.55.71
73	10.0.55.72/32	10.0.55.72 – 10.0.55.72	10.0.55.72
74	10.0.55.73/32	10.0.55.73 – 10.0.55.73	10.0.55.73
75	10.0.55.74/32	10.0.55.74 – 10.0.55.74	10.0.55.74
76	10.0.55.75/32	10.0.55.75 – 10.0.55.75	10.0.55.75
77	10.0.55.76/32	10.0.55.76 – 10.0.55.76	10.0.55.76
78	10.0.55.77/32	10.0.55.77 – 10.0.55.77	10.0.55.77
79	10.0.55.78/32	10.0.55.78 – 10.0.55.78	10.0.55.78
80	10.0.55.79/32	10.0.55.79 – 10.0.55.79	10.0.55.79
81	10.0.55.80/32	10.0.55.80 – 10.0.55.80	10.0.55.80
82	10.0.55.81/32	10.0.55.81 – 10.0.55.81	10.0.55.81
83	10.0.55.82/32	10.0.55.82 – 10.0.55.82	10.0.55.82
84	10.0.55.83/32	10.0.55.83 – 10.0.55.83	10.0.55.83
85	10.0.55.84/32	10.0.55.84 – 10.0.55.84	10.0.55.84
86	10.0.55.85/32	10.0.55.85 – 10.0.55.85	10.0.55.85
87	10.0.55.86/32	10.0.55.86 – 10.0.55.86	10.0.55.86
88	10.0.55.87/32	10.0.55.87 – 10.0.55.87	10.0.55.87
89	10.0.55.88/32	10.0.55.88 – 10.0.55.88	10.0.55.88
90	10.0.55.89/32	10.0.55.89 – 10.0.55.89	10.0.55.89
91	10.0.55.90/32	10.0.55.90 – 10.0.55.90	10.0.55.90
92	10.0.55.91/32	10.0.55.91 – 10.0.55.91	10.0.55.91
93	10.0.55.92/32	10.0.55.92 – 10.0.55.92	10.0.55.92
94	10.0.55.93/32	10.0.55.93 – 10.0.55.93	10.0.55.93
95	10.0.55.94/32	10.0.55.94 – 10.0.55.94	10.0.55.94
96	10.0.55.95/32	10.0.55.95 – 10.0.55.95	10.0.55.95
97	10.0.55.96/32	10.0.55.96 – 10.0.55.96	10.0.55.96
98	10.0.55.97/32	10.0.55.97 – 10.0.55.97	10.0.55.97
99	10.0.55.98/32	10.0.55.98 – 10.0.55.98	10.0.55.98
100	10.0.55.99/32	10.0.55.99 – 10.0.55.99	10.0.55.99
101	10.0.55.100/32	10.0.55.100 – 10.0.55.100	10.0.55.100
102	10.0.55.101/32	10.0.55.101 – 10.0.55.101	10.0.55.101
103	10.0.55.102/32	10.0.55.102 – 10.0.55.102	10.0.55.102
104	10.0.55.103/32	10.0.55.103 – 10.0.55.103	10.0.55.103
105	10.0.55.104/32	10.0.55.104 – 10.0.55.104	10.0.55.104
106	10.0.55.105/32	10.0.55.105 – 10.0.55.105	10.0.55.105
107	10.0.55.106/32	10.0.55.106 – 10.0.55.106	10.0.55.106
108	10.0.55.107/32	10.0.55.107 – 10.0.55.107	10.0.55.107
109	10.0.55.108/32	10.0.55.108 – 10.0.55.108	10.0.55.108
110	10.0.55.109/32	10.0.55.109 – 10.0.55.109	10.0.55.109
111	10.0.55.110/32	10.0.55.110 – 10.0.55.110	10.0.55.110
112	10.0.55.111/32	10.0.55.111 – 10.0.55.111	10.0.55.111
113	10.0.55.112/32	10.0.55.112 – 10.0.55.112	10.0.55.112
114	10.0.55.113/32	10.0.55.113 – 10.0.55.113	10.0.55.113
115	10.0.55.114/32	10.0.55.114 – 10.0.55.114	10.0.55.114
116	10.0.55.115/32	10.0.55.115 – 10.0.55.115	10.0.55.115
117	10.0.55.116/32	10.0.55.116 – 10.0.55.116	10.0.55.116
118	10.0.55.117/32	10.0.55.117 – 10.0.55.117	10.0.55.117
119	10.0.55.118/32	10.0.55.118 – 10.0.55.118	10.0.55.118
120	10.0.55.119/32	10.0.55.119 – 10.0.55.119	10.0.55.119
121	10.0.55.120/32	10.0.55.120 – 10.0.55.120	10.0.55.120
122	10.0.55.121/32	10.0.55.121 – 10.0.55.121	10.0.55.121
123	10.0.55.122/32	10.0.55.122 – 10.0.55.122	10.0.55.122
124	10.0.55.123/32	10.0.55.123 – 10.0.55.123	10.0.55.123
125	10.0.55.124/32	10.0.55.124 – 10.0.55.124	10.0.55.124
126	10.0.55.125/32	10.0.55.125 – 10.0.55.125	10.0.55.125
127	10.0.55.126/32	10.0.55.126 – 10.0.55.126	10.0.55.126
128	10.0.55.127/32	10.0.55.127 – 10.0.55.127	10.0.55.127

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 /25
/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	-
/24	255.255.255.0	256	254	-
/25	255.255.255.128	128	126	1
/26	255.255.255.192	64	62	2 split →
/27	255.255.255.224	32	30	4 split →
/28	255.255.255.240	16	14	8 split →
/29	255.255.255.248	8	6	16 split →
/30	255.255.255.252	4	2	32 split →
/31	255.255.255.254	2	2	64 split →
/32	255.255.255.255	1	1	128 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 →