<p-overlayPanel #op *ngIf="infraHostIPs && infraHostIPs.length > 1">
    <div *ngFor="let ip of infraHostIPs">
        {{ip.address}}
    </div>
</p-overlayPanel>

<a style="cursor: pointer; text-decoration: underline" (click)="op.toggle($event)">{{infraHostIPs[0].address}}</a>