BYOIP /48 limit too high!

Question

The BYOIP minimum CIDR size of /48 is way too high! I want to assign a /56 :(

```
[fred@debu.tanuki.agency ~]$ whois -h '' 'n / mfek-01-aws'

#
# ARIN WHOIS data and services are subject to the Terms of Use
# available at: https://www.arin.net/resources/registry/whois/tou/
#
# If you see inaccuracies in the results, please report at
# https://www.arin.net/resources/registry/whois/inaccuracy_reporting/
#
# Copyright 1997-2023, American Registry for Internet Numbers, Ltd.
#

NetRange:       2620:BB:A000:1000:: - 2620:BB:A000:10FF:FFFF:FFFF:FFFF:FFFF
CIDR:           2620:BB:A000:1000::/56
NetName:        MFEK-01-AWS
NetHandle:      NET6-2620-BB-A000-1000-1
Parent:         MFEK-01 (NET6-2620-BB-A000-1)
NetType:        Reassigned
OriginAS:       AS16509, AS14618
Customer:       Private Customer (C09834148)
RegDate:        2023-07-18
Updated:        2023-07-18
Comment:        -----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----
Ref:            https://rdap.arin.net/registry/ip/2620:BB:A000:1000::

CustName:       Private Customer
Address:        Private Residence
City:           Atlantic City
StateProv:      NJ
PostalCode:     08401
Country:        US
RegDate:        2023-07-18
Updated:        2023-07-18
Ref:            https://rdap.arin.net/registry/entity/C09834148

OrgAbuseHandle: FRB1-ARIN
OrgAbuseName:   Brennan, Fredrick Robert
OrgAbusePhone:  +1-609-674-3889 
OrgAbuseEmail:  copypaste@kittens.ph
OrgAbuseRef:    https://rdap.arin.net/registry/entity/FRB1-ARIN

OrgTechHandle: BRENN182-ARIN
OrgTechName:   Brennan, Fredrick 
OrgTechPhone:  +1-732-523-1767 
OrgTechEmail:  fred@mfek.org
OrgTechRef:    https://rdap.arin.net/registry/entity/BRENN182-ARIN

#
# ARIN WHOIS data and services are subject to the Terms of Use
# available at: https://www.arin.net/resources/registry/whois/tou/
#
# If you see inaccuracies in the results, please report at
# https://www.arin.net/resources/registry/whois/inaccuracy_reporting/
#
# Copyright 1997-2023, American Registry for Internet Numbers, Ltd.
#
```

**NOTICE: DO NOT FALSELY TAG THIS QUESTION AGAIN. I do not care that my name and address are showing I have them publicly posted in many places including FOUNDATION.MFEK.ORG, whois info of LULZ.NET, whois info of BRENNAN.JP, whois info of FATFC.UK etc. I do not consider information you can look up in a phonebook private, stop harassing me by tagging my posts. If you can't answer then just don't.**

Accepted Answer

The most specific IPv6 address range that you can bring is /48 for CIDRs that are publicly advertised, and /56 for CIDRs that are not publicly advertised. For IPv6 CIDRs, if you are adding them to an advertisable pool, the maximum length of an IP address prefix must be /48. This ensures that you have full flexibility to divide your public IP address across AWS Regions. IPAM enforces the maximum length you set. For more information about BYOIP addresses to IPAM, see Tutorial: BYOIP address CIDRs to IPAM in the Amazon VPC IPAM User Guide.

Reference : https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/ec2-byoip.html

Also in FAQ (Reference :https://aws.amazon.com/vpc/faqs/)

Q. What is the most specific prefix that I can bring via BYOIP?

Via BYOIP, the most specific IPv4 prefix you can bring is a /24 IPv4 prefix and a /56 IPv6 prefix. If you intend to advertise your Ipv6 prefix to the internet then most specific IPv6 prefix is /48.

Reference : https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/ec2-byoip.html

Also in FAQ (Reference :https://aws.amazon.com/vpc/faqs/)

Q. What is the most specific prefix that I can bring via BYOIP?

Via BYOIP, the most specific IPv4 prefix you can bring is a /24 IPv4 prefix and a /56 IPv6 prefix. If you intend to advertise your Ipv6 prefix to the internet then most specific IPv6 prefix is /48.

BYOIP /48 limit too high!

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