Strange PTR queries

[Dima Fadeyev]

Hello, everyone

I'm seeing strange PTR-queries from my dhcp machine.

IP x.x.x.x.39782 > 80.58.0.33.53: 43960+ PTR? 58.0.2.10.in-addr.arpa.
(40)
IP 80.58.0.33.53 > x.x.x.x.39782: 43960 NXDomain 0/1/0 (117)
IP x.x.x.x.53299 > 80.58.0.33.53: 34386+ PTR? 210.0.2.10.in-addr.arpa.
(41)
IP 80.58.0.33.53 > x.x.x.x.53299: 34386 NXDomain 0/1/0 (118)
.........

Has anyone seen something like that? I couldn't find any options in
dhcpd.conf or the manuals, related to this behavior (I have
"ddns-update-style none;" in the config, just in case you wonder if I'm
doing dynamic dns updates).

Thanks and best regards