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DLINT(8) System Manager's Manual DLINT(8) NAME dlint - Internet Domain Name System (DNS) error checking utility SYNOPSIS dlint [ -n ] zone DESCRIPTION DNS administrators can use dlint to scan recursively through the domain records of the fully-qualified zone zone, to get a report on any errors therein. You can scan a zone you own, or anyone else's zone on the Inter- net. dlint will talk directly to a primary or secondary nameserver for the zone, to make sure it's working with current information. dlint will also suggest ways to fix problems instead of just complaining about them like other debugging tools. The argument zone should always be terminated with a period to indicate it is a fully qualified domain name. OPTIONS By default, dlint recursively traverses the entire hierarchy below the zone specified. The -n option may be used to disable recursive traversal, caus- ing it to only examine the records in the given zone. Note that a zone may or may not contain any number of sub-domains (all of which will be checked with or without this option). EXAMPLES example% dlint nau.edu. will recursively scan the DNS records in zone nau.edu for problems. example% dlint 64.114.134.in-addr.arpa. will recursively scan the DNS records associated with the IP subnet 134.114.64.0 for problems. You already had to know that 134.114.0.0 was subnetted. DIAGNOSTICS The output from dlint is computer parsable, each line has a special mean- ing. Lines beginning with a semicolon (;) are comments only. Lines begin- ning with the phrase ``WARNING'' are informational lines you should con- sider. A warning is not necessarily an error, but may indicate a problem. Lines beginning with the phrase ``ERROR'' are definite errors and should be dealt with accordingly. EXIT STATUS 0 Successful run, no problems encountered with zone. 1 Successful run, problem(s) with zone emitted WARNING(s). 2 Successful run, problem(s) with zone emitted ERROR(s). 3 Usage error. 4 A signal interrupted the program run (i.e. user typed interrupt key sequence). BUGS Dlint doesn't work behind some firewalls because it needs to talk to a root nameserver to get started. Dlint uses the zone transfer mechanism (AXFR) which some nameservers deny to unauthorized hosts. Other nameservers happily return zero records instead of an error, in re- sponse to an unauthorized AXFR! That is just wrong. AUTHOR Paul Balyoz DISTRIBUTION https://codeberg.org/BSDforge/dlint COPYRIGHT Copyright (C) 1993-1998 Paul A. Balyoz Copyright (C) 2015-2025 Chris Hutchinson This program is free software; you can redistribute it and/or modify it un- der the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FIT- NESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. July 03 2025 DLINT(8)
NAME | SYNOPSIS | DESCRIPTION | OPTIONS | EXAMPLES | DIAGNOSTICS | EXIT STATUS | BUGS | AUTHOR | DISTRIBUTION | COPYRIGHT
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