Hi @Arun Prasath ,
the name of the network interface is looking like the NIC is related to domain controller of an Azure Azure Active Directory Domain Services service (AADDS).
In AADDS you can't see the 2 DC VMs in Azure Portal. But the related NICs, Loadbalancer, vNet, NSG and Public IP are visible.
You cant just delete the NIC but you can delete the full AADDS service instead: https://learn.microsoft.com/en-us/azure/active-directory-domain-services/delete-aadds
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Regards
Andreas Baumgarten