[db-wg] How does reverse delegation work for legacy resources across RIR?

According to https://www.iana.org/assignments/ipv4-address-space/ipv4-address-space.xhtml

147/8 Administered by ARIN 1993-05 whois.arin.net https://rdap.arin.net/registry
http://rdap.arin.net/registry LEGACY

>
$ dig 147.in-addr.arpa. ns

; <<>> DiG 9.16.1-Ubuntu <<>> 147.in-addr.arpa. ns
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 20223
;; flags: qr rd ra; QUERY: 1, ANSWER: 6, AUTHORITY: 0, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 65494
;; QUESTION SECTION:
;147.in-addr.arpa. IN NS

;; ANSWER SECTION:
147.in-addr.arpa. 86400 IN NS r.arin.net.
147.in-addr.arpa. 86400 IN NS u.arin.net.
147.in-addr.arpa. 86400 IN NS x.arin.net.
147.in-addr.arpa. 86400 IN NS y.arin.net.
147.in-addr.arpa. 86400 IN NS z.arin.net.
147.in-addr.arpa. 86400 IN NS arin.authdns.ripe.net.

;; Query time: 75 msec
;; SERVER: 127.0.0.53#53(127.0.0.53)
;; WHEN: Thu Oct 29 15:02:58 PDT 2020
;; MSG SIZE  rcvd: 165

>another example
$ dig 196.in-addr.arpa. ns +short
ns1.afrinic.net.
ns2.afrinic.net.
ns3.lacnic.net.
ns3.afrinic.net.
ns4.apnic.net.
tinnie.arin.net.
afrinic.authdns.ripe.net.


For legacy /8 that exists today in multiple RIRs, what is the process
to make sure rDNS gets delegated correctly and avoid split views? Is
there some mechanism to sync the zone across RIRs? How long does it
typically take for this type of reverse delegation update to get
reflected in DNS zone?

When I created a domain object for 208.75.147.in-addr.arpa., it didn't
show up in DNS until the next day.


Yang