c:\Windows\system32 arp -a
interfaz: 192.168.1.103 ---- 0x2
Dirección de Internet Dirección física tipo
192.168.1.1 c0-4a-00-c6-1e-e4 dinámico
192.168.1.255 ff-ff-ff-ff-ff-ff estático
224.0.0.2 01-00-5e-00-00-02 estático
224.0.0.22 01-00-5e-00-00-16 estático
224.0.0.252 01-00-5e-00-00-fc estático
239.255.255.250 01-00-5e-7f-ff-fa estático
255.255.255.255 ff-ff-ff-ff-ff-ff estático
192.168.1.1 -> Gateway (router)
192.168.1.255 -> Broadcast ("habla" a todos los host de esa red)
224.0.0.2 -> Se usa para "hablar" a todos los routers de la subnet, la MAC se encuentra en un rango entre 01:00:5E:00:00:00 - 01:00:5E:7F:FF:FF, si miras en el enlace que pasé verás que sirve para: "IPv4 Multicast"
224.0.0.22 -> The Internet Group Management Protocol (IGMP) is a communications protocol used by hosts and adjacent routers on IPv4 networks to establish multicast group memberships. IGMP is an integral part of IP multicast.
224.0.0.252 ->Se emplea para el protocolo LLMNR, The Link-Local Multicast Name Resolution (LLMNR) is a protocol based on the Domain Name System (DNS) packet format that allows both IPv4 and IPv6 hosts to perform name resolution for hosts on the same local link
239.255.255.250 -> Simple Service Discovery Protocol (SSDP) is a network protocol based on the Internet Protocol Suite for advertisement and discovery of network services and presence information. It accomplishes this without assistance of server-based configuration mechanisms, such as the Dynamic Host Configuration Protocol (DHCP) or the Domain Name System (DNS), and without special static configuration of a network host. SSDP is the basis of the discovery protocol of Universal Plug and Play (UPnP) and is intended for use in residential or small office environments
255.255.255.255 -> BC
Las MAC's son correctas y los protocolos como has visto verídicos, no me parece que haya nada extraño en tu tabla de arp, pero yo soy aún novato, esperemos a más opiniones
Saludos