Incomplete ARP table entry

is it normal to have an incomplete arp table with proxy03.fedoraproject.o ?
ive been having some trouble running updates lately on my acer aspire 5736Z-4685 and im beggining to think it may be related to hardware compatibility
let me know what you think?

Well, in reality an ARP table only contains the MAC addresses of the hosts of the networks which a network card is connected to.
So it is impossible to see MAC addresses of internet hosts.

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my internet connection is not hosted by fedoraproject.o

just an update my wifi adapter interface has changed
brother@localhost ~]$ arp
Address HWtype HWaddress Flags Mask Iface
_gateway ether 00:00:5e:00:52:13 C wlp4s0b1

is someone trying to put a pinhole in the firewall?