P/N: HSTNS-BN71 789897-001. TheHP 331FLR is aFlexibleLOM (FLR) network adapter featuring4 × 1 GbE RJ‑45 ports, targeted at HPE ProLiant Gen8 / Gen9 servers. It installs directly into the FLR slot on the motherboard, avoiding use of standard PCIe slots and thereby preserving expansion space.
eBay