IANA Private CIDRs

Respectable Spooks only?

[Angonasec]

This thread is prompted by a visit from someone on 172.16.0.0/12
NetName: PRIVATE-ADDRESS-BBLK-RFC1918-IANA-RESERVED

Unsurprisingly, no further information supplied.

Do you allow such-like access to your sites?

What sorts of owners do they belong to?

[not2easy]

All I've got for that is:
172/8 Administered by ARIN1993-05whois.arin.netLEGACY
Obviously, the cia, nsa, tfa, fbi is on to you.

[blend27]

Could be worst than that.

Imagine IRS or even Aliens from 172.16.0.0/24 ....

oh, wait a minute, Aliens switched to IPV6 last year.

[lucy24]

This is one of those questions where the inevitable follow-up is: Would you be able to get into your own site? A fair number of WebmasterWorld members use proxies or some type of obfuscation to protect their own privacy. A fair number of WebmasterWorld members block all requests from {proxies etcetera as above}.

At least ARIN has them in a big chunk (anyone ever met someone from 10?). Private assignments in RIPE tend to be a /22 here, a /19 there...

Sometimes there will be an X-Forwarded-For or similar header. Then you might get a better idea who you're dealing with.