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I'll second that. We have a little program that presents a rest api for dns type stuff. I've never really used the reverse stuff, but it works. Looks like it mostly returns a ptr record however. Not sure if that is what you are looking for. https://github.com/fcambus/rrda is what we run, and combining it with a query we use to monitory for SSL 5250 connections looks like this.

WITH netstat AS (
SELECT *
FROM QSYS2.NETSTAT_INFO
WHERE local_port = 992
)
SELECT DISTINCT
(
SELECT COALESCE(
JSON_VALUE(httpresponse.responsemsg,
'$.answer.rdata' RETURNING VARCHAR(256)),
JSON_VALUE(httpresponse.responsemsg, '$.message' RETURNING VARCHAR(256)))
FROM TABLE (
SYSTOOLS.HTTPGETCLOBVERBOSE(
URL => CAST(
'http://172.24.1.36:8080/8.8.8.8:53/x/' CONCAT
TRIM(netstat.remote_address) AS VARCHAR(255)),
HTTPHEADER => CAST(
'<httpHeader includeErrorMsg = "true"></httpHeader>' AS CLOB(1K)))) AS httpresponse) AS dns_lookup,
netstat.remote_address
FROM netstat
;

Gives me this
Some name that ought to exist, does not exist (NXDOMAIN) ::
068-117-204-187.res.spectrum.com. 68.117.204.187
Some name that ought to exist, does not exist (NXDOMAIN) 170.249.188.136
Some name that ought to exist, does not exist (NXDOMAIN) 172.24.1.226
wsip-70-183-112-48.no.no.cox.net. 70.183.112.48
45-25-16-60.lightspeed.nworla.sbcglobal.net. 45.25.16.60
Some name that ought to exist, does not exist (NXDOMAIN) 99.96.108.75
Some name that ought to exist, does not exist (NXDOMAIN) 192.168.2.140
Some name that ought to exist, does not exist (NXDOMAIN) 69.85.247.234
wsip-24-252-232-166.no.no.cox.net. 24.252.232.166
Some name that ought to exist, does not exist (NXDOMAIN) 10.2.7.115
107-195-140-211.lightspeed.nworla.sbcglobal.net. 107.195.140.211
66-208-198-233-Memphis.hfc.comcastbusiness.net. 66.208.198.233
104-56-70-137.lightspeed.nworla.sbcglobal.net. 104.56.70.137
Some name that ought to exist, does not exist (NXDOMAIN) 0.0.0.0
Some name that ought to exist, does not exist (NXDOMAIN) 172.24.1.225
99-188-191-112.lightspeed.brhmal.sbcglobal.net. 99.188.191.112


On Thu, 2021-07-08 at 10:10 -0500, David Gibbs via MIDRANGE-L wrote:
On 7/8/21 7:59 AM, Larry "DrFranken" Bolhuis wrote:
Is anyone aware of a way to translate an IP address returned by SQL to
its FQDN?

Although I haven't tried any of them, there are a number of web services
that offer DNS lookup's that should be relatively easy to consume from
SQL.

Here's one: https://dns-lookup.whoisxmlapi.com/api

david

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[https://www.medtronsoftware.com/img/MedtronMinilogo.bmp] Kevin Bucknum
Senior Programmer Analyst
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Covington LA 70433
Local: 985-893-2550
Toll Free: 877-893-2550
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