147.189.216.0/21

inetnum:        147.189.216.0 - 147.189.223.255
netname:        DNET-LEGACY-147-189
descr:          Antonios A. Chariton
org:            ORG-AAC10-RIPE
remarks:        The BGP Clock
remarks:        
remarks:        Every 1 hour the prefix 147.189.(216+N).0/24 is advertised. The
remarks:        N here is calculated as HH % 8, so the hour in 24h format
remarks:        modulo 8. Naturally, UTC is used. The prefix is withdrawn 10'
remarks:        after the advertisement.
remarks:        
remarks:        At most one /24 should be available at any single time, which
remarks:        means that all 8 prefixes of the /21 rotate 3 times a day.
remarks:        
remarks:        At 00:00, 147.189.216.0/24 is advertised, at 00:10 it is then
remarks:        withdrawn, then at 01:00 147.189.217.0/24 is advertised, which
remarks:        is in turn withdrawn at 01:10, and so on.
remarks:        
remarks:        Why? We are conducting research on BGP Stuck Routes to better
remarks:        understand how they happen, when, which equipment is more
remarks:        buggy, etc. We also want to understand them better. As this is
remarks:        a beacon, anyone can study the results using RIPE RIS, or any
remarks:        other source like RouteViews. Feel free to take a look and let
remarks:        everyone know if something interesting ever comes up!
remarks:        
remarks:        An example of research presented at RIPE 89 is here:
remarks:        https://ripe89.ripe.net/wp-content/uploads/presentations/8-BGP-Zombies-RIPE89.pdf
remarks:        
remarks:        We are also studying the propagation of BGP Communities with
remarks:        this beacon, to minimize the count of BGP UPDATEs generated.
remarks:        At origin, all prefixes are tagged with the following values:
remarks:        
remarks:        BGP Legacy Communities:
remarks:        (4492, 64700)
remarks:        (4601, 64700)
remarks:        
remarks:        BGP Extended Communities:
remarks:        (ro, 4492, 1337)
remarks:        (ro, 4601, 1337)
remarks:        (ro, 210312, 1337)
remarks:        
remarks:        BGP Large Communities:
remarks:        (4492, 64700, 1337)
remarks:        (4601, 64700, 1337)
remarks:        (210312, 64700, 1337)
remarks:        
remarks:        For any more info or collaboration, find me using the Contact
remarks:        page at daknob.net :)
country:        CH
geofeed:        https://geo.daknob.net/as210312.csv
remarks:        Geofeed https://geo.daknob.net/as210312.csv
admin-c:        AAC138-RIPE
tech-c:         AAC138-RIPE
status:         LEGACY
mnt-by:         RIPE-NCC-LEGACY-MNT
mnt-by:         gr-daknob-1-mnt
created:        2021-04-01T08:57:01Z
last-modified:  2025-06-10T12:26:19Z
source:         RIPE
abuse-email:    [email protected]
abuse-c:        AR48003-RIPE
abuse-org:      ORG-AAC10-RIPE

organisation:   ORG-AAC10-RIPE
org-name:       Antonios A. Chariton
country:        GR
org-type:       LIR
address:        Avidou 3
address:        59100
address:        Veria
address:        GREECE
phone:          +306988723888
e-mail:         [email protected]
admin-c:        AAC138-RIPE
tech-c:         AAC138-RIPE
abuse-c:        AR48003-RIPE
mnt-ref:        gr-daknob-1-mnt
mnt-by:         RIPE-NCC-HM-MNT
mnt-by:         gr-daknob-1-mnt
created:        2018-08-27T09:36:18Z
last-modified:  2020-12-16T13:43:07Z
source:         RIPE
abuse-email:    [email protected]
abuse-c:        AR48003-RIPE
abuse-org:      undefined

person:         Antonios A. Chariton
address:        Avidou 3
address:        59100
address:        Veria
address:        GREECE
e-mail:         [email protected]
phone:          +306988723888
nic-hdl:        AAC138-RIPE
mnt-by:         gr-daknob-1-mnt
created:        2018-08-27T09:36:17Z
last-modified:  2018-08-27T12:26:27Z
source:         RIPE

route:          147.189.216.0/21
origin:         AS4601
remarks:        The BGP Clock
remarks:        
remarks:        Read the inetnum for 147.189.216.0/21 for (much) more info!
mnt-by:         gr-daknob-1-mnt
created:        2024-10-21T14:17:17Z
last-modified:  2025-06-06T11:22:38Z
source:         RIPE