LHN95 - EPSG:5729

WKT

VERTCS["LHN95", 
	VDATUM["Landeshohennetz_1995"], 
	PARAMETER["Vertical_Shift", 0.0], 
	PARAMETER["Direction", 1.0], 
	UNIT["Meter", 1.0]]

WKT2

VERTCRS["LHN95", 
	VDATUM["Landeshohennetz_1995"], 
	CS[vertical, 1], 
	AXIS["Gravity-related height (H)", up, 
		LENGTHUNIT["Meter", 1.0]], 
	ID["EPSG", "5729"]]

Data from @esri/proj-codes

{
  "wkid": 5729,
  "latestWkid": 5729,
  "macro": "PE_VCS_LHN95",
  "name": "LHN95",
  "wkt": "VERTCS[\"LHN95\",VDATUM[\"Landeshohennetz_1995\"],PARAMETER[\"Vertical_Shift\",0.0],PARAMETER[\"Direction\",1.0],UNIT[\"Meter\",1.0]]",
  "wkt2": "VERTCRS[\"LHN95\",VDATUM[\"Landeshohennetz_1995\"],CS[vertical,1],AXIS[\"Gravity-related height (H)\",up,LENGTHUNIT[\"Meter\",1.0]],ID[\"EPSG\",\"5729\"]]",
  "description": "LHN95",
  "authority": "EPSG",
  "version": "6.7(9.3.0.0)",
  "deprecated": "no",
  "areaname": "Europe - Liechtenstein and Switzerland",
  "extent": {
    "slat": 45.81,
    "nlat": 47.81,
    "llon": 5.95,
    "rlon": 10.5
  }
}