Find IP IPv4 Network/Subnet and its host address ranges

What is an IPv4 IP address its network and host address ranges?

An IPv4 IP address is an address used in order to uniquely identify a device on an IP network. The address is made up of 32 binary bits, which can be divisible into a network portion and host portion with the help of a subnet mask. The 32 binary bits are broken into four octets (1 octet = 8 bits). Each octet is converted to decimal and separated by a period (dot).

How to Subnet IPv4? Its simple answer is that subnetting is the process of taking a network and splitting it into smaller networks, known as subnets. It's used to free up more public IPv4 addresses and segment networks for security and easier management.
Following are the ranges of IPv4 subnet/network address and their host addresses.

IPv4 AddressIPv6 Address
170.255.21.1 0:0:0:0:0:ffff:aaff:1501
170.255.21.2 0:0:0:0:0:ffff:aaff:1502
170.255.21.3 0:0:0:0:0:ffff:aaff:1503
170.255.21.4 0:0:0:0:0:ffff:aaff:1504
170.255.21.5 0:0:0:0:0:ffff:aaff:1505
170.255.21.6 0:0:0:0:0:ffff:aaff:1506
170.255.21.7 0:0:0:0:0:ffff:aaff:1507
170.255.21.8 0:0:0:0:0:ffff:aaff:1508
170.255.21.9 0:0:0:0:0:ffff:aaff:1509
170.255.21.10 0:0:0:0:0:ffff:aaff:150a
170.255.21.11 0:0:0:0:0:ffff:aaff:150b
170.255.21.12 0:0:0:0:0:ffff:aaff:150c
170.255.21.13 0:0:0:0:0:ffff:aaff:150d
170.255.21.14 0:0:0:0:0:ffff:aaff:150e
170.255.21.15 0:0:0:0:0:ffff:aaff:150f
170.255.21.16 0:0:0:0:0:ffff:aaff:1510
170.255.21.17 0:0:0:0:0:ffff:aaff:1511
170.255.21.18 0:0:0:0:0:ffff:aaff:1512
170.255.21.19 0:0:0:0:0:ffff:aaff:1513
170.255.21.20 0:0:0:0:0:ffff:aaff:1514
170.255.21.21 0:0:0:0:0:ffff:aaff:1515
170.255.21.22 0:0:0:0:0:ffff:aaff:1516
170.255.21.23 0:0:0:0:0:ffff:aaff:1517
170.255.21.24 0:0:0:0:0:ffff:aaff:1518
170.255.21.25 0:0:0:0:0:ffff:aaff:1519
170.255.21.26 0:0:0:0:0:ffff:aaff:151a
170.255.21.27 0:0:0:0:0:ffff:aaff:151b
170.255.21.28 0:0:0:0:0:ffff:aaff:151c
170.255.21.29 0:0:0:0:0:ffff:aaff:151d
170.255.21.30 0:0:0:0:0:ffff:aaff:151e
170.255.21.31 0:0:0:0:0:ffff:aaff:151f
170.255.21.32 0:0:0:0:0:ffff:aaff:1520
170.255.21.33 0:0:0:0:0:ffff:aaff:1521
170.255.21.34 0:0:0:0:0:ffff:aaff:1522
170.255.21.35 0:0:0:0:0:ffff:aaff:1523
170.255.21.36 0:0:0:0:0:ffff:aaff:1524
170.255.21.37 0:0:0:0:0:ffff:aaff:1525
170.255.21.38 0:0:0:0:0:ffff:aaff:1526
170.255.21.39 0:0:0:0:0:ffff:aaff:1527
170.255.21.40 0:0:0:0:0:ffff:aaff:1528
170.255.21.41 0:0:0:0:0:ffff:aaff:1529
170.255.21.42 0:0:0:0:0:ffff:aaff:152a
170.255.21.43 0:0:0:0:0:ffff:aaff:152b
170.255.21.44 0:0:0:0:0:ffff:aaff:152c
170.255.21.45 0:0:0:0:0:ffff:aaff:152d
170.255.21.46 0:0:0:0:0:ffff:aaff:152e
170.255.21.47 0:0:0:0:0:ffff:aaff:152f
170.255.21.48 0:0:0:0:0:ffff:aaff:1530
170.255.21.49 0:0:0:0:0:ffff:aaff:1531
170.255.21.50 0:0:0:0:0:ffff:aaff:1532
170.255.21.51 0:0:0:0:0:ffff:aaff:1533
170.255.21.52 0:0:0:0:0:ffff:aaff:1534
170.255.21.53 0:0:0:0:0:ffff:aaff:1535
170.255.21.54 0:0:0:0:0:ffff:aaff:1536
170.255.21.55 0:0:0:0:0:ffff:aaff:1537
170.255.21.56 0:0:0:0:0:ffff:aaff:1538
170.255.21.57 0:0:0:0:0:ffff:aaff:1539
170.255.21.58 0:0:0:0:0:ffff:aaff:153a
170.255.21.59 0:0:0:0:0:ffff:aaff:153b
170.255.21.60 0:0:0:0:0:ffff:aaff:153c


170.255.21.61 0:0:0:0:0:ffff:aaff:153d
170.255.21.62 0:0:0:0:0:ffff:aaff:153e
170.255.21.63 0:0:0:0:0:ffff:aaff:153f
170.255.21.64 0:0:0:0:0:ffff:aaff:1540
170.255.21.65 0:0:0:0:0:ffff:aaff:1541
170.255.21.66 0:0:0:0:0:ffff:aaff:1542
170.255.21.67 0:0:0:0:0:ffff:aaff:1543
170.255.21.68 0:0:0:0:0:ffff:aaff:1544
170.255.21.69 0:0:0:0:0:ffff:aaff:1545
170.255.21.70 0:0:0:0:0:ffff:aaff:1546
170.255.21.71 0:0:0:0:0:ffff:aaff:1547
170.255.21.72 0:0:0:0:0:ffff:aaff:1548
170.255.21.73 0:0:0:0:0:ffff:aaff:1549
170.255.21.74 0:0:0:0:0:ffff:aaff:154a
170.255.21.75 0:0:0:0:0:ffff:aaff:154b
170.255.21.76 0:0:0:0:0:ffff:aaff:154c
170.255.21.77 0:0:0:0:0:ffff:aaff:154d
170.255.21.78 0:0:0:0:0:ffff:aaff:154e
170.255.21.79 0:0:0:0:0:ffff:aaff:154f
170.255.21.80 0:0:0:0:0:ffff:aaff:1550
170.255.21.81 0:0:0:0:0:ffff:aaff:1551
170.255.21.82 0:0:0:0:0:ffff:aaff:1552
170.255.21.83 0:0:0:0:0:ffff:aaff:1553
170.255.21.84 0:0:0:0:0:ffff:aaff:1554
170.255.21.85 0:0:0:0:0:ffff:aaff:1555
170.255.21.86 0:0:0:0:0:ffff:aaff:1556
170.255.21.87 0:0:0:0:0:ffff:aaff:1557
170.255.21.88 0:0:0:0:0:ffff:aaff:1558
170.255.21.89 0:0:0:0:0:ffff:aaff:1559
170.255.21.90 0:0:0:0:0:ffff:aaff:155a
170.255.21.91 0:0:0:0:0:ffff:aaff:155b
170.255.21.92 0:0:0:0:0:ffff:aaff:155c
170.255.21.93 0:0:0:0:0:ffff:aaff:155d
170.255.21.94 0:0:0:0:0:ffff:aaff:155e
170.255.21.95 0:0:0:0:0:ffff:aaff:155f
170.255.21.96 0:0:0:0:0:ffff:aaff:1560
170.255.21.97 0:0:0:0:0:ffff:aaff:1561
170.255.21.98 0:0:0:0:0:ffff:aaff:1562
170.255.21.99 0:0:0:0:0:ffff:aaff:1563
170.255.21.100 0:0:0:0:0:ffff:aaff:1564
170.255.21.101 0:0:0:0:0:ffff:aaff:1565
170.255.21.102 0:0:0:0:0:ffff:aaff:1566
170.255.21.103 0:0:0:0:0:ffff:aaff:1567
170.255.21.104 0:0:0:0:0:ffff:aaff:1568
170.255.21.105 0:0:0:0:0:ffff:aaff:1569
170.255.21.106 0:0:0:0:0:ffff:aaff:156a
170.255.21.107 0:0:0:0:0:ffff:aaff:156b
170.255.21.108 0:0:0:0:0:ffff:aaff:156c
170.255.21.109 0:0:0:0:0:ffff:aaff:156d
170.255.21.110 0:0:0:0:0:ffff:aaff:156e
170.255.21.111 0:0:0:0:0:ffff:aaff:156f
170.255.21.112 0:0:0:0:0:ffff:aaff:1570
170.255.21.113 0:0:0:0:0:ffff:aaff:1571
170.255.21.114 0:0:0:0:0:ffff:aaff:1572
170.255.21.115 0:0:0:0:0:ffff:aaff:1573
170.255.21.116 0:0:0:0:0:ffff:aaff:1574
170.255.21.117 0:0:0:0:0:ffff:aaff:1575
170.255.21.118 0:0:0:0:0:ffff:aaff:1576
170.255.21.119 0:0:0:0:0:ffff:aaff:1577
170.255.21.120 0:0:0:0:0:ffff:aaff:1578


170.255.21.121 0:0:0:0:0:ffff:aaff:1579
170.255.21.122 0:0:0:0:0:ffff:aaff:157a
170.255.21.123 0:0:0:0:0:ffff:aaff:157b
170.255.21.124 0:0:0:0:0:ffff:aaff:157c
170.255.21.125 0:0:0:0:0:ffff:aaff:157d
170.255.21.126 0:0:0:0:0:ffff:aaff:157e
170.255.21.127 0:0:0:0:0:ffff:aaff:157f
170.255.21.128 0:0:0:0:0:ffff:aaff:1580
170.255.21.129 0:0:0:0:0:ffff:aaff:1581
170.255.21.130 0:0:0:0:0:ffff:aaff:1582
170.255.21.131 0:0:0:0:0:ffff:aaff:1583
170.255.21.132 0:0:0:0:0:ffff:aaff:1584
170.255.21.133 0:0:0:0:0:ffff:aaff:1585
170.255.21.134 0:0:0:0:0:ffff:aaff:1586
170.255.21.135 0:0:0:0:0:ffff:aaff:1587
170.255.21.136 0:0:0:0:0:ffff:aaff:1588
170.255.21.137 0:0:0:0:0:ffff:aaff:1589
170.255.21.138 0:0:0:0:0:ffff:aaff:158a
170.255.21.139 0:0:0:0:0:ffff:aaff:158b
170.255.21.140 0:0:0:0:0:ffff:aaff:158c
170.255.21.141 0:0:0:0:0:ffff:aaff:158d
170.255.21.142 0:0:0:0:0:ffff:aaff:158e
170.255.21.143 0:0:0:0:0:ffff:aaff:158f
170.255.21.144 0:0:0:0:0:ffff:aaff:1590
170.255.21.145 0:0:0:0:0:ffff:aaff:1591
170.255.21.146 0:0:0:0:0:ffff:aaff:1592
170.255.21.147 0:0:0:0:0:ffff:aaff:1593
170.255.21.148 0:0:0:0:0:ffff:aaff:1594
170.255.21.149 0:0:0:0:0:ffff:aaff:1595
170.255.21.150 0:0:0:0:0:ffff:aaff:1596
170.255.21.151 0:0:0:0:0:ffff:aaff:1597
170.255.21.152 0:0:0:0:0:ffff:aaff:1598
170.255.21.153 0:0:0:0:0:ffff:aaff:1599
170.255.21.154 0:0:0:0:0:ffff:aaff:159a
170.255.21.155 0:0:0:0:0:ffff:aaff:159b
170.255.21.156 0:0:0:0:0:ffff:aaff:159c
170.255.21.157 0:0:0:0:0:ffff:aaff:159d
170.255.21.158 0:0:0:0:0:ffff:aaff:159e
170.255.21.159 0:0:0:0:0:ffff:aaff:159f
170.255.21.160 0:0:0:0:0:ffff:aaff:15a0
170.255.21.161 0:0:0:0:0:ffff:aaff:15a1
170.255.21.162 0:0:0:0:0:ffff:aaff:15a2
170.255.21.163 0:0:0:0:0:ffff:aaff:15a3
170.255.21.164 0:0:0:0:0:ffff:aaff:15a4
170.255.21.165 0:0:0:0:0:ffff:aaff:15a5
170.255.21.166 0:0:0:0:0:ffff:aaff:15a6
170.255.21.167 0:0:0:0:0:ffff:aaff:15a7
170.255.21.168 0:0:0:0:0:ffff:aaff:15a8
170.255.21.169 0:0:0:0:0:ffff:aaff:15a9
170.255.21.170 0:0:0:0:0:ffff:aaff:15aa
170.255.21.171 0:0:0:0:0:ffff:aaff:15ab
170.255.21.172 0:0:0:0:0:ffff:aaff:15ac
170.255.21.173 0:0:0:0:0:ffff:aaff:15ad
170.255.21.174 0:0:0:0:0:ffff:aaff:15ae
170.255.21.175 0:0:0:0:0:ffff:aaff:15af
170.255.21.176 0:0:0:0:0:ffff:aaff:15b0
170.255.21.177 0:0:0:0:0:ffff:aaff:15b1
170.255.21.178 0:0:0:0:0:ffff:aaff:15b2
170.255.21.179 0:0:0:0:0:ffff:aaff:15b3
170.255.21.180 0:0:0:0:0:ffff:aaff:15b4


170.255.21.181 0:0:0:0:0:ffff:aaff:15b5
170.255.21.182 0:0:0:0:0:ffff:aaff:15b6
170.255.21.183 0:0:0:0:0:ffff:aaff:15b7
170.255.21.184 0:0:0:0:0:ffff:aaff:15b8
170.255.21.185 0:0:0:0:0:ffff:aaff:15b9
170.255.21.186 0:0:0:0:0:ffff:aaff:15ba
170.255.21.187 0:0:0:0:0:ffff:aaff:15bb
170.255.21.188 0:0:0:0:0:ffff:aaff:15bc
170.255.21.189 0:0:0:0:0:ffff:aaff:15bd
170.255.21.190 0:0:0:0:0:ffff:aaff:15be
170.255.21.191 0:0:0:0:0:ffff:aaff:15bf
170.255.21.192 0:0:0:0:0:ffff:aaff:15c0
170.255.21.193 0:0:0:0:0:ffff:aaff:15c1
170.255.21.194 0:0:0:0:0:ffff:aaff:15c2
170.255.21.195 0:0:0:0:0:ffff:aaff:15c3
170.255.21.196 0:0:0:0:0:ffff:aaff:15c4
170.255.21.197 0:0:0:0:0:ffff:aaff:15c5
170.255.21.198 0:0:0:0:0:ffff:aaff:15c6
170.255.21.199 0:0:0:0:0:ffff:aaff:15c7
170.255.21.200 0:0:0:0:0:ffff:aaff:15c8
170.255.21.201 0:0:0:0:0:ffff:aaff:15c9
170.255.21.202 0:0:0:0:0:ffff:aaff:15ca
170.255.21.203 0:0:0:0:0:ffff:aaff:15cb
170.255.21.204 0:0:0:0:0:ffff:aaff:15cc
170.255.21.205 0:0:0:0:0:ffff:aaff:15cd
170.255.21.206 0:0:0:0:0:ffff:aaff:15ce
170.255.21.207 0:0:0:0:0:ffff:aaff:15cf
170.255.21.208 0:0:0:0:0:ffff:aaff:15d0
170.255.21.209 0:0:0:0:0:ffff:aaff:15d1
170.255.21.210 0:0:0:0:0:ffff:aaff:15d2
170.255.21.211 0:0:0:0:0:ffff:aaff:15d3
170.255.21.212 0:0:0:0:0:ffff:aaff:15d4
170.255.21.213 0:0:0:0:0:ffff:aaff:15d5
170.255.21.214 0:0:0:0:0:ffff:aaff:15d6
170.255.21.215 0:0:0:0:0:ffff:aaff:15d7
170.255.21.216 0:0:0:0:0:ffff:aaff:15d8
170.255.21.217 0:0:0:0:0:ffff:aaff:15d9
170.255.21.218 0:0:0:0:0:ffff:aaff:15da
170.255.21.219 0:0:0:0:0:ffff:aaff:15db
170.255.21.220 0:0:0:0:0:ffff:aaff:15dc
170.255.21.221 0:0:0:0:0:ffff:aaff:15dd
170.255.21.222 0:0:0:0:0:ffff:aaff:15de
170.255.21.223 0:0:0:0:0:ffff:aaff:15df
170.255.21.224 0:0:0:0:0:ffff:aaff:15e0
170.255.21.225 0:0:0:0:0:ffff:aaff:15e1
170.255.21.226 0:0:0:0:0:ffff:aaff:15e2
170.255.21.227 0:0:0:0:0:ffff:aaff:15e3
170.255.21.228 0:0:0:0:0:ffff:aaff:15e4
170.255.21.229 0:0:0:0:0:ffff:aaff:15e5
170.255.21.230 0:0:0:0:0:ffff:aaff:15e6
170.255.21.231 0:0:0:0:0:ffff:aaff:15e7
170.255.21.232 0:0:0:0:0:ffff:aaff:15e8
170.255.21.233 0:0:0:0:0:ffff:aaff:15e9
170.255.21.234 0:0:0:0:0:ffff:aaff:15ea
170.255.21.235 0:0:0:0:0:ffff:aaff:15eb
170.255.21.236 0:0:0:0:0:ffff:aaff:15ec
170.255.21.237 0:0:0:0:0:ffff:aaff:15ed
170.255.21.238 0:0:0:0:0:ffff:aaff:15ee
170.255.21.239 0:0:0:0:0:ffff:aaff:15ef
170.255.21.240 0:0:0:0:0:ffff:aaff:15f0
170.255.21.241 0:0:0:0:0:ffff:aaff:15f1
170.255.21.242 0:0:0:0:0:ffff:aaff:15f2
170.255.21.243 0:0:0:0:0:ffff:aaff:15f3
170.255.21.244 0:0:0:0:0:ffff:aaff:15f4
170.255.21.245 0:0:0:0:0:ffff:aaff:15f5
170.255.21.246 0:0:0:0:0:ffff:aaff:15f6
170.255.21.247 0:0:0:0:0:ffff:aaff:15f7
170.255.21.248 0:0:0:0:0:ffff:aaff:15f8
170.255.21.249 0:0:0:0:0:ffff:aaff:15f9
170.255.21.250 0:0:0:0:0:ffff:aaff:15fa
170.255.21.251 0:0:0:0:0:ffff:aaff:15fb
170.255.21.252 0:0:0:0:0:ffff:aaff:15fc
170.255.21.253 0:0:0:0:0:ffff:aaff:15fd
170.255.21.254 0:0:0:0:0:ffff:aaff:15fe
170.255.21.255 0:0:0:0:0:ffff:aaff:15ff


How we got IPv4 subnet masks?

An IPv4 subnet mask consists of 32 bits; it is a sequence of ones (1) followed by a block of zeros (0). The ones indicate bits in the address used for the network prefix and the trailing block of zeros designates that part as being the host identifier.