>>> import uuid
>>> request_id = uuid.uuid4()
>>> user = User.objects.get(username='volans')
>>> def update(d):
...     ip = d.primary_ip6
...     log = ip.to_objectchange('update')
...     log.request_id = request_id
...     log.user = user
...     ip.dns_name = ""
...     ip.save()
...     log.save()
...
>>> devices = Device.objects.filter(name__in=["db2196","db2197","db2198","db2199","db2200","db2201","db2202","db2203","db2204","db2205","db2206","db2207","db2208","db2209","db2210","db2211","db2212","db2213","db2214","db2215","db2216","db2217","db2218","db2219","db2220","es1035","es1036","es1037","es1038","es1039","es1040"])
>>> len(devices)
31
>>> [d.name for d in devices]
['db2196', 'db2197', 'db2198', 'db2199', 'db2200', 'db2201', 'db2202', 'db2203', 'db2204', 'db2205', 'db2206', 'db2207', 'db2208', 'db2209', 'db2210', 'db2211', 'db2212', 'db2213', 'db2214', 'db2215', 'db2216', 'db2217', 'db2218', 'db2219', 'db2220', 'es1035', 'es1036', 'es1037', 'es1038', 'es1039', 'es1040']
>>> for device in devices:
...     update(device)
...
>>>

while read line; do sudo cookbook sre.dns.wipe-cache "$line.codfw.wmnet"; sleep 1; done <<< $(nodeset -S '\n' -e "db[2196-2220]")

# and

while read line; do sudo cookbook sre.dns.wipe-cache "$line.eqiad.wmnet"; sleep 1; done <<< $(nodeset -S '\n' -e "es10[35-40]")