You appear based on what you posted have a domain with 2 subdomains/hostnames which are pointed to different IP's.

You haven't provided the actual domain name so we will substitute domainname for it.

@     is pointed to 176.58.100.62  (hostname is domainname)
new   is pointed at 178.79.139.244 (hostname is new.domainname)
serps is pointed at 176.56.57.6    (hostname is serps.domainname)

Two are linode IP's the third has no rDNS but is related to ns1.nimbushosting.co.uk prehaps a hosting account there.

You should know about these if this is your domain.

nope, I know nothing of these.

176.58.100.62 is my current ip address for my linode.

178.79.139.244 is my old linode, about to be powered down and deactivated.

I paid someone to upgrade and set up the new linode in late December. The third IP address means nothing at all to me.

Ive never heard of Nimbushhosting and I dont understand how they are in anyway connect to my linode?? Have I been hacked or something ?? How do you know its Nimbushhosting ??

@glennk:

176.58.100.62 is my current ip address for my linode.

178.79.139.244 is my old linode, about to be powered down and deactivated.

I paid someone to upgrade and set up the new linode in late December. The third IP address means nothing at all to me.

Ive never heard of Nimbushhosting and I dont understand how they are in anyway connect to my linode?? Have I been hacked or something ?? How do you know its Nimbushhosting ??
Someone who has access to your Linode added the entry into your DNS. If someone has access to your Linode that you don't know about, I would consider that to be a serious issue and steps should be taken to remedy that. They basically have the keys to your entire host.

Ref:

dig -x 176.56.57.6

; <<>> DiG 9.8.4-rpz2+rl005.12-P1 <<>> -x 176.56.57.6

;; global options: +cmd

;; Got answer:

;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 42679

;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 0

;; QUESTION SECTION:

;6.57.56.176.in-addr.arpa. IN PTR

;; AUTHORITY SECTION:

57.56.176.in-addr.arpa. 3600 IN SOA ns1.nimbushosting.co.uk. hostmaster.nimbushosting.co.uk. 2015012304 3600 3600 86400 3600

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@Dweeber:

@glennk:

I paid someone to upgrade and set up the new linode in late December. The third IP address means nothing at all to me.
Someone who has access to your Linode added the entry into your DNS.
Not necessarily with access to the linode, but to the linode control panel where DNS editing can be done (assuming this domain is using the linode DNS service).

It's likely the OP's consultant set it up, so the question should be for the OP to ask the consultant why it is there.

What is it ?? Please understand Im a newbie to servers and dns. Ive usually bought shared hosting before.

You said "I paid someone to upgrade and set up the new linode in late December. The third IP address means nothing at all to me."

You need to talk to that person to find out why the "serps" entry is there.

A casual Google search shows that "serps" has something to do with search engine optimization (SEO) and/or advertising. Have you ever partnered with an advertiser, or trusted your website with a company that claimed to help you with SEO?

If you're absolutely sure that you have nothing to do with this "serps" thing and no relation whatsoever with the Nimbus Hosting IP address, why not just delete it and see if it breaks anything? If something breaks, you can quickly add it back.