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Is it possible, that these IPs are printers or other devices like NAS devices or something similar?<br />
<br />
The device your can ping, can you resolve the name? (ping -a xxx)
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Is it possible, that these IPs are printers or other devices like NAS devices or something similar?

The device your can ping, can you resolve the name? (ping -a xxx)

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I set up a Windows 2003 DHCP server, but 3 of the addresses are flagged in the DHCP server as BAD ADDRESSES. They show a unique ID in the column where MAC addresses normally show up. The IDs are e50110ac, f70110ac, and e80110ac.<br />
<br />
One will respond to pings, the other two dont. If I delete them from the DHCP list they come back as bad addresses again. <br />
<br />
How can I find these on the network without a lot of manually searching?
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I set up a Windows 2003 DHCP server, but 3 of the addresses are flagged in the DHCP server as BAD ADDRESSES. They show a unique ID in the column where MAC addresses normally show up. The IDs are e50110ac, f70110ac, and e80110ac.

One will respond to pings, the other two dont. If I delete them from the DHCP list they come back as bad addresses again. 

How can I find these on the network without a lot of manually searching?

How do I find rogue IP addresses?

The Dynamic Host Configuration Protocol (DHCP) is an auto configuration protocol used on IP networks and an extension of the Bootstrap Protocol. DHCP allows for computers to be configured automatically to communicate with each other over an IP network without the need for manual setup by a network administrator. The implementation of DHCP relies on a DHCP server to hand out network configuration information to DHCP-capable clients that request an IP address (and other information required or useful in communicating with other devices on an IP network). In addition to an IP address, common configuration information served over DHCP includes a default gateway, subnet mask and DNS sever(s).

DHCP

Windows Server 2003 was based on Windows XP and was released in four editions: Web, Standard, Enterprise and Datacenter. It also had derivative versions for clusters, storage and Microsoft’s Small Business Server. Important upgrades included integrating Internet Information Services (IIS), improvements to Active Directory (AD) and Group Policy (GP), and the migration to Automated System Recovery (ASR).