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FAQ about IPv4 Addresses

IPv4 Market Group has assembled a list of Questions and their Answers based on items asked of us by our clients.

Q: What does it mean on an ARIN registry record when it says "ADDRESSES WITHIN THIS BLOCK ARE NON-PORTABLE."

A: This is listed in Public Comments, mostly on older registrations where an org used to be able to put this comment in their template, resulting in it showing up as a public comment in Whois.  It just means that the ISP customer cannot take the IP addresses to another ISP.  It does not impede a transfer.


NetRange:       x.0.0.0 - x.63.255.255
CIDR:           x.0.0.0/10 OriginAS:
NetName:        NETBLK-xxxxx
NetHandle:      NET-x-0-0-0-1
Parent:         NET-x-0-0-0-0
NetType:        Direct Allocation
RegDate:        1998-07-31
Updated:        2001-09-26
Ref:            http://whois.arin.net/rest/net/NET-x-0-0-0-1


Q: If I wish to transfer IPs in the RIPE region, what are the guidelines in terms of block size?

A: RIPE NCC currently has no minimum transfer size.  A policy proposal was drafted in March 2014 and accepted, which abandoned the minimum allocation size for IPv4.


Q: Is it better for a company in the APNIC region to acquire IPv4 numbers from the ARIN region or from the APNIC region?

A: The advantage of acquiring IPs from within the APNIC region is that the transfer process is much more streamlined and more assured. The process itself is accomplished using MyAPNIC, and with only APNIC involved, is very quick.

ARIN adds at least 10 days to the process, to get through its queue, collect the seller fee and affidavit of right to transfer, and handover to APNIC. APNIC IPs are in relatively short supply.


Q: How long will IPv4 be around and in demand?

A: Who really knows? IPv6 uptake statistics are growing, but IPv4 is needed for dual stack, and IPv6 is much less prevalent than desired.  Many predictions expect IPv4 to be in demand for the next seven to ten years.


Q: In purchasing IPs, how should IP quality be checked?

A: IPv4 Market Group has experience in this area.  We use a variety of resources to examine IP reputation and check for blacklisting, including our own software developed to scan a large number of IPs.  If IPs are to be used for email, then they are often pre-tested to ensure that they are not blocked by commonly used blacklists.  It is recommended that you seek additional internal or external expertise when possible to ensure the best possible results.