With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
ciiManAreaAddr
Cisco IS-IS Man Area Address
1.3.6.1.4.1.9.10.118.1.1.2.1.1
A manually configured area address for this system. This object follows the index behavior. Note: an index for the entry {1, {49.0001} active} in this table would be the ordered pair (1, (0x03 0x49 0x00 0x01)), as the length of an Octet string is part of the OID.
Back to CISCO-IETF-ISIS-MIB MIB page.
IPHost Network monitor allows you to monitor ciiManAreaAddr on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco routers right now.