IP range details

81.0.204.0/23

AS21430 · WIA spol. s.r.o.

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Summary

Country	Czechia
Domain	casablanca.cz
ASN	AS21430
Registry	ripe
Hosted IPs	512
ID	PRAHA9-NET

WHOIS Details

inetnum:        81.0.204.0 - 81.0.204.255
netname:        PRAHA9-NET
descr:          Prague9 wifi access
country:        CZ
admin-c:        CASA3-RIPE
tech-c:         CASA3-RIPE
status:         ASSIGNED PA
created:        2009-09-30T07:11:34Z
last-modified:  2020-11-18T14:26:02Z
source:         RIPE
mnt-by:         CASABLANCA-RIPE-MNT
mnt-by:         WIA-AS-MNT
abuse-email:    abuse@wia.cz
abuse-c:        WAC9-RIPE
abuse-org:      ORG-Wss1-RIPE

role:           Casablanca INT RIPE manager
address:        Casablanca INT
address:        Vinohradska 184, Prague 3 - 130 52
address:        Czech republic
phone:          +420 270 000 270
fax-no:         +420 270 000 277
e-mail:         hostmaster@casablanca.cz
abuse-mailbox:  abuse@casablanca.cz
admin-c:        JH1771-RIPE
tech-c:         JH1771-RIPE
notify:         hostmaster@casablanca.cz
nic-hdl:        CASA3-RIPE
created:        2005-09-05T10:42:10Z
last-modified:  2015-07-03T11:19:49Z
source:         RIPE
mnt-by:         CASABLANCA-CORE-MNT

route:          81.0.204.0/23
descr:          CASA to WIA transfer
origin:         AS21430
mnt-by:         CASABLANCA-CORE-MNT
mnt-by:         WIA-AS-MNT
created:        2019-09-03T22:31:57Z
last-modified:  2019-09-03T22:31:57Z
source:         RIPE

Hosted domains

There are no domains currently hosted on this ASN.

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What are IP address ranges?

IP address ranges, or netblocks, are groups of related IP addresses. They are usually represented as a base IP address, followed by a slash, and then a netmask which represents how many IP addresses are contained within the netblock. This format is known as CIDR. You'll also sometimes see netblocks given as a start ip address, and an end ip address, or an ip address range.

Traffic works its way around the internet based on the routing table, which contains a list of networks and their associated netblocks.

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