Answer TTL

Address Stays the Same

The countdown changes freshness, not the answer address bytes.

highlighted = computed this step

The address is not counted down

The TTL can shrink in a cache, but the answer address bytes remain 0x5db8d822.

RDATA=0x5db8d822\text{RDATA}=0x5db8d822
Address stays explicitThe answer record is decoded from the exact DNS response bytes.Answer NAME pointer16 bits / 2 bytes0xc00cbyte 0byte 11100000000001100markeroffset12marker: 3Answer record fields112 bits / 14 bytes0x000100010000012c00045db8d822byte 0byte 1byte 2byte 300000000000000010000000000000001byte 4byte 5byte 6byte 700000000000000000000000100101100byte 8byte 9byte 10byte 1100000000000001000101110110111000byte 12byte 131101100000100010type0x0001class0x0001ttl300rdlength4rdata93.184.216.34(cont.)

Read the address bytes

Those four bytes decode to 93.184.216.34.

address=93.184.216.34\text{address}=93.184.216.34
Address stays explicitThe answer record is decoded from the exact DNS response bytes.Answer NAME pointer16 bits / 2 bytes0xc00cbyte 0byte 11100000000001100markeroffset12marker: 3Answer record fields112 bits / 14 bytes0x000100010000012c00045db8d822byte 0byte 1byte 2byte 300000000000000010000000000000001byte 4byte 5byte 6byte 700000000000000000000000100101100byte 8byte 9byte 10byte 1100000000000001000101110110111000byte 12byte 131101100000100010type0x0001class0x0001ttl300rdlength4rdata93.184.216.34(cont.)

Length names the address size

RDLENGTH is 4, matching the address byte count.

RDLENGTH=4\text{RDLENGTH}=4
Address stays explicitThe answer record is decoded from the exact DNS response bytes.Answer NAME pointer16 bits / 2 bytes0xc00cbyte 0byte 11100000000001100markeroffset12marker: 3Answer record fields112 bits / 14 bytes0x000100010000012c00045db8d822byte 0byte 1byte 2byte 300000000000000010000000000000001byte 4byte 5byte 6byte 700000000000000000000000100101100byte 8byte 9byte 10byte 1100000000000001000101110110111000byte 12byte 131101100000100010type0x0001class0x0001ttl300rdlength4rdata93.184.216.34(cont.)

Summary

The countdown changes cache freshness, not the answer address value.

address bytes=4\text{address bytes}=4
Address stays explicitThe answer record is decoded from the exact DNS response bytes.Answer NAME pointer16 bits / 2 bytes0xc00cbyte 0byte 11100000000001100markeroffset12marker: 3Answer record fields112 bits / 14 bytes0x000100010000012c00045db8d822byte 0byte 1byte 2byte 300000000000000010000000000000001byte 4byte 5byte 6byte 700000000000000000000000100101100byte 8byte 9byte 10byte 1100000000000001000101110110111000byte 12byte 131101100000100010type0x0001class0x0001ttl300rdlength4rdata93.184.216.34(cont.)