public Address getNextExternalSymbolAddress() {
		int extID = 1;
		Address maxAddr = getMaxSymbolAddress(AddressSpace.EXTERNAL_SPACE);
		if (maxAddr != null) {
			extID = (int) maxAddr.getOffset() + 1;
		}
		return AddressSpace.EXTERNAL_SPACE.getAddress(extID);
	}
Returns the next available external symbol address

@return the address
Ghidra/Framework/SoftwareModeling/src/main/java/ghidra/program/database/symbol/SymbolManager.java