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)10.2.253.0/25

network10.2.253.0/25

broadcast10.2.253.127

first host10.2.253.1

last host10.2.253.126

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.2.253.0/25

address00001010.00000010.11111101.00000000

subnet mask11111111.11111111.11111111.10000000

network00001010.00000010.11111101.00000000

broadcast00001010.00000010.11111101.01111111

green = network part, grey = host part

hex0x0a02fd00

decimal167968000

reverse dns0.253.2.10.in-addr.arpa

ipv4-mapped::ffff:a02:fd00

/25 split into /32 · 128 subnets

close ×

#	network	host range	broadcast
1	10.2.253.0/32	10.2.253.0 – 10.2.253.0	10.2.253.0
2	10.2.253.1/32	10.2.253.1 – 10.2.253.1	10.2.253.1
3	10.2.253.2/32	10.2.253.2 – 10.2.253.2	10.2.253.2
4	10.2.253.3/32	10.2.253.3 – 10.2.253.3	10.2.253.3
5	10.2.253.4/32	10.2.253.4 – 10.2.253.4	10.2.253.4
6	10.2.253.5/32	10.2.253.5 – 10.2.253.5	10.2.253.5
7	10.2.253.6/32	10.2.253.6 – 10.2.253.6	10.2.253.6
8	10.2.253.7/32	10.2.253.7 – 10.2.253.7	10.2.253.7
9	10.2.253.8/32	10.2.253.8 – 10.2.253.8	10.2.253.8
10	10.2.253.9/32	10.2.253.9 – 10.2.253.9	10.2.253.9
11	10.2.253.10/32	10.2.253.10 – 10.2.253.10	10.2.253.10
12	10.2.253.11/32	10.2.253.11 – 10.2.253.11	10.2.253.11
13	10.2.253.12/32	10.2.253.12 – 10.2.253.12	10.2.253.12
14	10.2.253.13/32	10.2.253.13 – 10.2.253.13	10.2.253.13
15	10.2.253.14/32	10.2.253.14 – 10.2.253.14	10.2.253.14
16	10.2.253.15/32	10.2.253.15 – 10.2.253.15	10.2.253.15
17	10.2.253.16/32	10.2.253.16 – 10.2.253.16	10.2.253.16
18	10.2.253.17/32	10.2.253.17 – 10.2.253.17	10.2.253.17
19	10.2.253.18/32	10.2.253.18 – 10.2.253.18	10.2.253.18
20	10.2.253.19/32	10.2.253.19 – 10.2.253.19	10.2.253.19
21	10.2.253.20/32	10.2.253.20 – 10.2.253.20	10.2.253.20
22	10.2.253.21/32	10.2.253.21 – 10.2.253.21	10.2.253.21
23	10.2.253.22/32	10.2.253.22 – 10.2.253.22	10.2.253.22
24	10.2.253.23/32	10.2.253.23 – 10.2.253.23	10.2.253.23
25	10.2.253.24/32	10.2.253.24 – 10.2.253.24	10.2.253.24
26	10.2.253.25/32	10.2.253.25 – 10.2.253.25	10.2.253.25
27	10.2.253.26/32	10.2.253.26 – 10.2.253.26	10.2.253.26
28	10.2.253.27/32	10.2.253.27 – 10.2.253.27	10.2.253.27
29	10.2.253.28/32	10.2.253.28 – 10.2.253.28	10.2.253.28
30	10.2.253.29/32	10.2.253.29 – 10.2.253.29	10.2.253.29
31	10.2.253.30/32	10.2.253.30 – 10.2.253.30	10.2.253.30
32	10.2.253.31/32	10.2.253.31 – 10.2.253.31	10.2.253.31
33	10.2.253.32/32	10.2.253.32 – 10.2.253.32	10.2.253.32
34	10.2.253.33/32	10.2.253.33 – 10.2.253.33	10.2.253.33
35	10.2.253.34/32	10.2.253.34 – 10.2.253.34	10.2.253.34
36	10.2.253.35/32	10.2.253.35 – 10.2.253.35	10.2.253.35
37	10.2.253.36/32	10.2.253.36 – 10.2.253.36	10.2.253.36
38	10.2.253.37/32	10.2.253.37 – 10.2.253.37	10.2.253.37
39	10.2.253.38/32	10.2.253.38 – 10.2.253.38	10.2.253.38
40	10.2.253.39/32	10.2.253.39 – 10.2.253.39	10.2.253.39
41	10.2.253.40/32	10.2.253.40 – 10.2.253.40	10.2.253.40
42	10.2.253.41/32	10.2.253.41 – 10.2.253.41	10.2.253.41
43	10.2.253.42/32	10.2.253.42 – 10.2.253.42	10.2.253.42
44	10.2.253.43/32	10.2.253.43 – 10.2.253.43	10.2.253.43
45	10.2.253.44/32	10.2.253.44 – 10.2.253.44	10.2.253.44
46	10.2.253.45/32	10.2.253.45 – 10.2.253.45	10.2.253.45
47	10.2.253.46/32	10.2.253.46 – 10.2.253.46	10.2.253.46
48	10.2.253.47/32	10.2.253.47 – 10.2.253.47	10.2.253.47
49	10.2.253.48/32	10.2.253.48 – 10.2.253.48	10.2.253.48
50	10.2.253.49/32	10.2.253.49 – 10.2.253.49	10.2.253.49
51	10.2.253.50/32	10.2.253.50 – 10.2.253.50	10.2.253.50
52	10.2.253.51/32	10.2.253.51 – 10.2.253.51	10.2.253.51
53	10.2.253.52/32	10.2.253.52 – 10.2.253.52	10.2.253.52
54	10.2.253.53/32	10.2.253.53 – 10.2.253.53	10.2.253.53
55	10.2.253.54/32	10.2.253.54 – 10.2.253.54	10.2.253.54
56	10.2.253.55/32	10.2.253.55 – 10.2.253.55	10.2.253.55
57	10.2.253.56/32	10.2.253.56 – 10.2.253.56	10.2.253.56
58	10.2.253.57/32	10.2.253.57 – 10.2.253.57	10.2.253.57
59	10.2.253.58/32	10.2.253.58 – 10.2.253.58	10.2.253.58
60	10.2.253.59/32	10.2.253.59 – 10.2.253.59	10.2.253.59
61	10.2.253.60/32	10.2.253.60 – 10.2.253.60	10.2.253.60
62	10.2.253.61/32	10.2.253.61 – 10.2.253.61	10.2.253.61
63	10.2.253.62/32	10.2.253.62 – 10.2.253.62	10.2.253.62
64	10.2.253.63/32	10.2.253.63 – 10.2.253.63	10.2.253.63
65	10.2.253.64/32	10.2.253.64 – 10.2.253.64	10.2.253.64
66	10.2.253.65/32	10.2.253.65 – 10.2.253.65	10.2.253.65
67	10.2.253.66/32	10.2.253.66 – 10.2.253.66	10.2.253.66
68	10.2.253.67/32	10.2.253.67 – 10.2.253.67	10.2.253.67
69	10.2.253.68/32	10.2.253.68 – 10.2.253.68	10.2.253.68
70	10.2.253.69/32	10.2.253.69 – 10.2.253.69	10.2.253.69
71	10.2.253.70/32	10.2.253.70 – 10.2.253.70	10.2.253.70
72	10.2.253.71/32	10.2.253.71 – 10.2.253.71	10.2.253.71
73	10.2.253.72/32	10.2.253.72 – 10.2.253.72	10.2.253.72
74	10.2.253.73/32	10.2.253.73 – 10.2.253.73	10.2.253.73
75	10.2.253.74/32	10.2.253.74 – 10.2.253.74	10.2.253.74
76	10.2.253.75/32	10.2.253.75 – 10.2.253.75	10.2.253.75
77	10.2.253.76/32	10.2.253.76 – 10.2.253.76	10.2.253.76
78	10.2.253.77/32	10.2.253.77 – 10.2.253.77	10.2.253.77
79	10.2.253.78/32	10.2.253.78 – 10.2.253.78	10.2.253.78
80	10.2.253.79/32	10.2.253.79 – 10.2.253.79	10.2.253.79
81	10.2.253.80/32	10.2.253.80 – 10.2.253.80	10.2.253.80
82	10.2.253.81/32	10.2.253.81 – 10.2.253.81	10.2.253.81
83	10.2.253.82/32	10.2.253.82 – 10.2.253.82	10.2.253.82
84	10.2.253.83/32	10.2.253.83 – 10.2.253.83	10.2.253.83
85	10.2.253.84/32	10.2.253.84 – 10.2.253.84	10.2.253.84
86	10.2.253.85/32	10.2.253.85 – 10.2.253.85	10.2.253.85
87	10.2.253.86/32	10.2.253.86 – 10.2.253.86	10.2.253.86
88	10.2.253.87/32	10.2.253.87 – 10.2.253.87	10.2.253.87
89	10.2.253.88/32	10.2.253.88 – 10.2.253.88	10.2.253.88
90	10.2.253.89/32	10.2.253.89 – 10.2.253.89	10.2.253.89
91	10.2.253.90/32	10.2.253.90 – 10.2.253.90	10.2.253.90
92	10.2.253.91/32	10.2.253.91 – 10.2.253.91	10.2.253.91
93	10.2.253.92/32	10.2.253.92 – 10.2.253.92	10.2.253.92
94	10.2.253.93/32	10.2.253.93 – 10.2.253.93	10.2.253.93
95	10.2.253.94/32	10.2.253.94 – 10.2.253.94	10.2.253.94
96	10.2.253.95/32	10.2.253.95 – 10.2.253.95	10.2.253.95
97	10.2.253.96/32	10.2.253.96 – 10.2.253.96	10.2.253.96
98	10.2.253.97/32	10.2.253.97 – 10.2.253.97	10.2.253.97
99	10.2.253.98/32	10.2.253.98 – 10.2.253.98	10.2.253.98
100	10.2.253.99/32	10.2.253.99 – 10.2.253.99	10.2.253.99
101	10.2.253.100/32	10.2.253.100 – 10.2.253.100	10.2.253.100
102	10.2.253.101/32	10.2.253.101 – 10.2.253.101	10.2.253.101
103	10.2.253.102/32	10.2.253.102 – 10.2.253.102	10.2.253.102
104	10.2.253.103/32	10.2.253.103 – 10.2.253.103	10.2.253.103
105	10.2.253.104/32	10.2.253.104 – 10.2.253.104	10.2.253.104
106	10.2.253.105/32	10.2.253.105 – 10.2.253.105	10.2.253.105
107	10.2.253.106/32	10.2.253.106 – 10.2.253.106	10.2.253.106
108	10.2.253.107/32	10.2.253.107 – 10.2.253.107	10.2.253.107
109	10.2.253.108/32	10.2.253.108 – 10.2.253.108	10.2.253.108
110	10.2.253.109/32	10.2.253.109 – 10.2.253.109	10.2.253.109
111	10.2.253.110/32	10.2.253.110 – 10.2.253.110	10.2.253.110
112	10.2.253.111/32	10.2.253.111 – 10.2.253.111	10.2.253.111
113	10.2.253.112/32	10.2.253.112 – 10.2.253.112	10.2.253.112
114	10.2.253.113/32	10.2.253.113 – 10.2.253.113	10.2.253.113
115	10.2.253.114/32	10.2.253.114 – 10.2.253.114	10.2.253.114
116	10.2.253.115/32	10.2.253.115 – 10.2.253.115	10.2.253.115
117	10.2.253.116/32	10.2.253.116 – 10.2.253.116	10.2.253.116
118	10.2.253.117/32	10.2.253.117 – 10.2.253.117	10.2.253.117
119	10.2.253.118/32	10.2.253.118 – 10.2.253.118	10.2.253.118
120	10.2.253.119/32	10.2.253.119 – 10.2.253.119	10.2.253.119
121	10.2.253.120/32	10.2.253.120 – 10.2.253.120	10.2.253.120
122	10.2.253.121/32	10.2.253.121 – 10.2.253.121	10.2.253.121
123	10.2.253.122/32	10.2.253.122 – 10.2.253.122	10.2.253.122
124	10.2.253.123/32	10.2.253.123 – 10.2.253.123	10.2.253.123
125	10.2.253.124/32	10.2.253.124 – 10.2.253.124	10.2.253.124
126	10.2.253.125/32	10.2.253.125 – 10.2.253.125	10.2.253.125
127	10.2.253.126/32	10.2.253.126 – 10.2.253.126	10.2.253.126
128	10.2.253.127/32	10.2.253.127 – 10.2.253.127	10.2.253.127

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 →